How do you capture the values of pblack and t inside a variable from this ffmpeg command?
Normally when you run this command from the terminal, it would give you output as follows
ffmpeg -i "video.mkv" -r 1 -loop 1 -i $HOME/test.png -an -filtercomplex "blend=difference:shortest=1,blackframe=95:32" -f null -
[Parsedblackframe1 @ 0x6000013880b0] frame:15168 pblack:80 pts:252800 t:252.800000 type:P lastkeyframe:15000
Parsed_blackframe_1 @ 0x6000013880b0 frame:15169 pblack:81 pts:252817 t:252.817000 type:B lastkeyframe:15000
But lets say I wanted to run this from a bash noscript and extract the values of pblack and t in a json array like this \[\[80, 252.8\], \[81, 252.817\]\] what do I do?
I am assuming bash doesnt support array inside array
**This is what I tried and it does not work**
vals=ffmpeg -i "video.mkv" -r 1 -loop 1 -i $HOME/test.png -an -filtercomplex "blend=difference:shortest=1,blackframe=95:32" -f null - 2>&1 | grep blackframe | sed 's/.pblack\:\(.\)/\1/'
​
https://redd.it/17yscy2
@r_bash
Normally when you run this command from the terminal, it would give you output as follows
ffmpeg -i "video.mkv" -r 1 -loop 1 -i $HOME/test.png -an -filtercomplex "blend=difference:shortest=1,blackframe=95:32" -f null -
[Parsedblackframe1 @ 0x6000013880b0] frame:15168 pblack:80 pts:252800 t:252.800000 type:P lastkeyframe:15000
Parsed_blackframe_1 @ 0x6000013880b0 frame:15169 pblack:81 pts:252817 t:252.817000 type:B lastkeyframe:15000
But lets say I wanted to run this from a bash noscript and extract the values of pblack and t in a json array like this \[\[80, 252.8\], \[81, 252.817\]\] what do I do?
I am assuming bash doesnt support array inside array
**This is what I tried and it does not work**
vals=ffmpeg -i "video.mkv" -r 1 -loop 1 -i $HOME/test.png -an -filtercomplex "blend=difference:shortest=1,blackframe=95:32" -f null - 2>&1 | grep blackframe | sed 's/.pblack\:\(.\)/\1/'
​
https://redd.it/17yscy2
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
Simple iterate through a directory to delete matched files not working
Hello,
I am simply trying to delete files in a directory that would match. However, wildcards are not working as expected when there is more than one match (`nf-flow` `nf-log` , etc.):
for MODULES in ppp pppoe nf-* nfnetlink nft-* *usb-core *usb2 *usb-ehci; do
if test -e /etc/modules.d/$MODULES; then
rm /etc/modules.d/$MODULES
fi
done
The wildcard errors with `unknown operand`
I have tried:
redirecting to > `/dev/null 2>&1` as well as `[[ test -e /etc/modules.d/$MODULES ]]` to recognize the wildcard but it still errors with `unknown operand`.
Stumped.
https://redd.it/17z2cyb
@r_bash
Hello,
I am simply trying to delete files in a directory that would match. However, wildcards are not working as expected when there is more than one match (`nf-flow` `nf-log` , etc.):
for MODULES in ppp pppoe nf-* nfnetlink nft-* *usb-core *usb2 *usb-ehci; do
if test -e /etc/modules.d/$MODULES; then
rm /etc/modules.d/$MODULES
fi
done
The wildcard errors with `unknown operand`
I have tried:
redirecting to > `/dev/null 2>&1` as well as `[[ test -e /etc/modules.d/$MODULES ]]` to recognize the wildcard but it still errors with `unknown operand`.
Stumped.
https://redd.it/17z2cyb
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
read-ing and process substitution (named pipes?), but simpler?
Hi!
So, this is working fine (as expected, for me). But it bothers me to have an echo there for some reason. Is there a cleaner way? Some way to read straight from a variable?
$ data="1 2 3"
$ read x y z tail < <(echo $data)
$ echo $x $y $z
1 2 3
Also, this doesnt work. I guess its because 'read' is an internal command and doesnt have a stdin "of its own"? Also, that doesnt get rid of the echo anyway:)
$ echo $data | read x y z tail
$ echo $x $y $z
<blank>
And just for kicks i tried this, but had to ctrl-c my way out of it. Longshot anyway.
$ read -i "$data" x y z tail
^C
​
https://redd.it/17zau5s
@r_bash
Hi!
So, this is working fine (as expected, for me). But it bothers me to have an echo there for some reason. Is there a cleaner way? Some way to read straight from a variable?
$ data="1 2 3"
$ read x y z tail < <(echo $data)
$ echo $x $y $z
1 2 3
Also, this doesnt work. I guess its because 'read' is an internal command and doesnt have a stdin "of its own"? Also, that doesnt get rid of the echo anyway:)
$ echo $data | read x y z tail
$ echo $x $y $z
<blank>
And just for kicks i tried this, but had to ctrl-c my way out of it. Longshot anyway.
$ read -i "$data" x y z tail
^C
​
https://redd.it/17zau5s
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
Trying to figure out how to implement a specific operation on bash arrays as efficiently as possible
So, say I have an array `A` that looks like the following:
A=(a$'\n' 'b c'$'\n' d e$'\n' f$'\n') #note: the "real" A typically has 512 elements
Notice that all elements end in a newline except for one: `d`
The goal here is to identify any elements that do NOT end with a newline and combine them with the following element, transforming A to
A=(a$'\n' 'b c'$'\n' de$'\n' f$'\n') #note: every element now ends in a newline.
It is worth noting that
1. This could occur at any element in the array (except for the last element)
2. The chances of this occurring are very slim. Itll happen on average once every 200,000 or so elements, so out of every 4000-ish `A` arrays one will have this.
3. While not 100% required, a pure-bash solution is much preferred over solutions that depend on external binaries.
My best solution so far is
IFS=
A[-1]="${A[-1]%$'\n')"
mapfile A <<<"${A[*]}"
`"${A[*]}"` prints each element of `A` separated by the 1st character of IFS, which is nothing meaning no separation. The newlines at the end of each element break it up for `mapfile` to read, and by omitting the `-t` flag mapfile keeps the newlines. You have to remove the final newline or else you add a single empty element to the end. This works, but increases the overall runtime of the code it is a part of by 50% or more (depending on the specific workload).
Any Ideas? Thanks in advance.
***
Information about the actual code and the actual issue that inspired this post is below.
[This](https://github.com/jkool702/forkrun/blob/testing-mySplit/mySplit.bash) is the actual code it is going in. I need this to deal with a weird issue I've encountered related to reading and writing to the same file at the same time. To be honest I dont understand why this issue is happening, so if anyone has an idea I'm all ears.
The code provides `xargs`-like functionality for parallelizing loops (only is faster). It writes/appends stdin to a tmpfile (on `/dev/shm`) with one background process, and reads data from the beginning of this file with another background process (well several other background processes, but only one is reading at a given time). This gets around "reading 1 byte at a time from a pipe", but because data can be read faster than it can be written the reading process occasionally "catches up" to the writing one, causing it to think it hit an EOF and you get a partial read line.
To correct for this, I run `mapfile` without the `-t` flag and check if the last element ends with a newline, and if not I keep reading until I hit one and then append the data onto `A[-1]`. Which works 100% reliably....for `A[-1]`
The weird issue that I dont fully understand is that in 1 line out of every 200,000 or so, mapfile splits a seemingly random line in half for seemingly no reason. It is almost like mapfile hits an EOF but instead of stopping and returning a partial line in `A[-1]` it just keeps going, in effect splitting the line into 2 array indices (the first of which does not end with a newline). Hense this question on how to efficiently deal with this.
https://redd.it/17zchsq
@r_bash
So, say I have an array `A` that looks like the following:
A=(a$'\n' 'b c'$'\n' d e$'\n' f$'\n') #note: the "real" A typically has 512 elements
Notice that all elements end in a newline except for one: `d`
The goal here is to identify any elements that do NOT end with a newline and combine them with the following element, transforming A to
A=(a$'\n' 'b c'$'\n' de$'\n' f$'\n') #note: every element now ends in a newline.
It is worth noting that
1. This could occur at any element in the array (except for the last element)
2. The chances of this occurring are very slim. Itll happen on average once every 200,000 or so elements, so out of every 4000-ish `A` arrays one will have this.
3. While not 100% required, a pure-bash solution is much preferred over solutions that depend on external binaries.
My best solution so far is
IFS=
A[-1]="${A[-1]%$'\n')"
mapfile A <<<"${A[*]}"
`"${A[*]}"` prints each element of `A` separated by the 1st character of IFS, which is nothing meaning no separation. The newlines at the end of each element break it up for `mapfile` to read, and by omitting the `-t` flag mapfile keeps the newlines. You have to remove the final newline or else you add a single empty element to the end. This works, but increases the overall runtime of the code it is a part of by 50% or more (depending on the specific workload).
Any Ideas? Thanks in advance.
***
Information about the actual code and the actual issue that inspired this post is below.
[This](https://github.com/jkool702/forkrun/blob/testing-mySplit/mySplit.bash) is the actual code it is going in. I need this to deal with a weird issue I've encountered related to reading and writing to the same file at the same time. To be honest I dont understand why this issue is happening, so if anyone has an idea I'm all ears.
The code provides `xargs`-like functionality for parallelizing loops (only is faster). It writes/appends stdin to a tmpfile (on `/dev/shm`) with one background process, and reads data from the beginning of this file with another background process (well several other background processes, but only one is reading at a given time). This gets around "reading 1 byte at a time from a pipe", but because data can be read faster than it can be written the reading process occasionally "catches up" to the writing one, causing it to think it hit an EOF and you get a partial read line.
To correct for this, I run `mapfile` without the `-t` flag and check if the last element ends with a newline, and if not I keep reading until I hit one and then append the data onto `A[-1]`. Which works 100% reliably....for `A[-1]`
The weird issue that I dont fully understand is that in 1 line out of every 200,000 or so, mapfile splits a seemingly random line in half for seemingly no reason. It is almost like mapfile hits an EOF but instead of stopping and returning a partial line in `A[-1]` it just keeps going, in effect splitting the line into 2 array indices (the first of which does not end with a newline). Hense this question on how to efficiently deal with this.
https://redd.it/17zchsq
@r_bash
GitHub
forkrun/mySplit.bash at testing-mySplit · jkool702/forkrun
runs multiple inputs through a noscript/function in parallel using bash coprocs - jkool702/forkrun
How do you convince your team to use logrotate?
I know this will sound stupid but we are using find with combination with exec command instead of logrotate to find the log files and delete it. It's not like we've been using it for a long time, I just put them few weeks ago. Because they hesitated to use logrotate which they didn't really know well.
There is 1 team member whose decision is important and I've informed him about this issue(to learn this)....
I'm not hopeful he'll get time to learn because he is very busy guy.
https://redd.it/17zjiot
@r_bash
I know this will sound stupid but we are using find with combination with exec command instead of logrotate to find the log files and delete it. It's not like we've been using it for a long time, I just put them few weeks ago. Because they hesitated to use logrotate which they didn't really know well.
There is 1 team member whose decision is important and I've informed him about this issue(to learn this)....
I'm not hopeful he'll get time to learn because he is very busy guy.
https://redd.it/17zjiot
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
how do I assign sed -E 's/."url":"([^"])./\1/' to b named variable in bash
how to do
b=" sed -E 's/.\"url":"([\^"\]*).*/\\1/' "
​
it is showing errors like
​
b="sed -E 's/.*"url":"([\^"\]*).*/\\1/'"
∙
∙
∙
∙
∙
​
​
these empty spaces
​
what should i do now
https://redd.it/17ztwr8
@r_bash
how to do
b=" sed -E 's/.\"url":"([\^"\]*).*/\\1/' "
​
it is showing errors like
​
b="sed -E 's/.*"url":"([\^"\]*).*/\\1/'"
∙
∙
∙
∙
∙
​
​
these empty spaces
​
what should i do now
https://redd.it/17ztwr8
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
Removing noscript/header bar from terminal
I'm using i3 on both desktop and laptop, I searched for different solutions on removing a noscript/header bar (whichever you call it, the bar with the "File Edit View Search Terminal Help" buttons) some of them being, adding these lines to my i3 config:
default_border pixel 1 #or 0
default_floating_border pixel 1 #or 0
or just
new_window pixel1
With no avail. The border on my pc still persists and with them here, i3 doesn't notify of an error with the config file. On the other note, I remember adding a line to
I even tried straight up scp-ing the i3/config and picom.conf files from the other machine which didn't fix the issue.
​
https://redd.it/180bcqs
@r_bash
I'm using i3 on both desktop and laptop, I searched for different solutions on removing a noscript/header bar (whichever you call it, the bar with the "File Edit View Search Terminal Help" buttons) some of them being, adding these lines to my i3 config:
default_border pixel 1 #or 0
default_floating_border pixel 1 #or 0
or just
new_window pixel1
With no avail. The border on my pc still persists and with them here, i3 doesn't notify of an error with the config file. On the other note, I remember adding a line to
crontab -e on my laptop (and later removing it) which seems to have done the trick. I rambled through the browsing history but couldn't find the site from which I copied the line. I even tried straight up scp-ing the i3/config and picom.conf files from the other machine which didn't fix the issue.
​
https://redd.it/180bcqs
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
Using sed to replace mismatched characters
I'm looking to contribute to an open source project, where I noticed that it prints commands like this:
I now want to use sed to replace the single quotes with matching ` in each bash noscript, but I can't get the right pattern.
The closest I got was being able to replace all single quotes with a `, but obviously I only want it where it's mismatched.
Is sed appropriate for this?
I'm ripping my hair out trying to learn the way to do it with the CLI instead of just writing a Python noscript.
Any pointers for how I could do this?
I'm on MacOS btw, so it's BSD sed. I've tried looking at the man pages and reading up online, but it's kinda confusing to me.
https://redd.it/180fncv
@r_bash
I'm looking to contribute to an open source project, where I noticed that it prints commands like this:
<command>'
Where inside the echoed string, a backtick is being matched with a single quote.
I checked the bash noscript, and this is how it's coded. First off - is this a mistake, or just a formatting error in my terminal?
So anyway, I used grep to find all instances of \ and luckily the codebase is not that big, so I could manually check which are being closed by a single quote.I now want to use sed to replace the single quotes with matching ` in each bash noscript, but I can't get the right pattern.
The closest I got was being able to replace all single quotes with a `, but obviously I only want it where it's mismatched.
Is sed appropriate for this?
I'm ripping my hair out trying to learn the way to do it with the CLI instead of just writing a Python noscript.
Any pointers for how I could do this?
I'm on MacOS btw, so it's BSD sed. I've tried looking at the man pages and reading up online, but it's kinda confusing to me.
https://redd.it/180fncv
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
confusing difference in behaviour between bash test and [ ]
Hi all,
it seems I found a difference in the behaviour of the bash builtin
$ touch foobar
$ if [ -e foo* ] ; then echo found ; fi
$ if [ -e "foo*" ] ; then echo found ; fi
$ if test -e foo ; then echo found ; fi
found
$ if test -e "foo" ; then echo found ; fi
$ type test
test is a shell builtin
$ type [
[[ is a shell keyword
$ bash --version
GNU bash, version 5.1.16(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Apparently `[[` doesn't expand wildcards. If I got the docs right it should behave like `test` with additional operators to combine expressions, so this surprised me.
Is this expected or a weird bug/edge case? I'm just trying to understand, the `test` solution if fine for my needs.
Thx
[https://redd.it/180lnb2
@r_bash
Hi all,
it seems I found a difference in the behaviour of the bash builtin
test and [[.$ touch foobar
$ if [ -e foo* ] ; then echo found ; fi
$ if [ -e "foo*" ] ; then echo found ; fi
$ if test -e foo ; then echo found ; fi
found
$ if test -e "foo" ; then echo found ; fi
$ type test
test is a shell builtin
$ type [
[[ is a shell keyword
$ bash --version
GNU bash, version 5.1.16(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Apparently `[[` doesn't expand wildcards. If I got the docs right it should behave like `test` with additional operators to combine expressions, so this surprised me.
Is this expected or a weird bug/edge case? I'm just trying to understand, the `test` solution if fine for my needs.
Thx
[https://redd.it/180lnb2
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
Delve into the world of Bash
As an aspiring programmer, I'm eager to delve into the world of bash noscripting. Could you recommend a comprehensive resource that covers the full spectrum of bash noscripting concepts, from beginner to advanced level?
https://redd.it/180kybu
@r_bash
As an aspiring programmer, I'm eager to delve into the world of bash noscripting. Could you recommend a comprehensive resource that covers the full spectrum of bash noscripting concepts, from beginner to advanced level?
https://redd.it/180kybu
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
Idk how to setup bash on windows
Actually i know how to setup bash on windows but it is not working as i expected. I am trying to make a scanner tool like the other tools on kali but im on windows so it is not working. Any ideas or solutions for that problem? Thanks.
https://redd.it/180nje0
@r_bash
Actually i know how to setup bash on windows but it is not working as i expected. I am trying to make a scanner tool like the other tools on kali but im on windows so it is not working. Any ideas or solutions for that problem? Thanks.
https://redd.it/180nje0
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
Autocompletion for any shell and any command.
​
https://i.redd.it/hb4eu1qd3u1c1.gif
Features:
* Support multiple shells: bash/zsh/powershell/fish/nushell/elvish/xonsh
* Support multiple platforms: windows/macOS/linux
* Built-in completions for 1000+ commands ([full list](https://github.com/sigoden/argc-completions/blob/main/MANIFEST.md))
* Automatically generate completion noscript from help-text/man-page
* Lazy completing, lower memory consumption and faster startup time
source code: [https://github.com/sigoden/argc-completions](https://github.com/sigoden/argc-completions)
https://redd.it/1811o8n
@r_bash
​
https://i.redd.it/hb4eu1qd3u1c1.gif
Features:
* Support multiple shells: bash/zsh/powershell/fish/nushell/elvish/xonsh
* Support multiple platforms: windows/macOS/linux
* Built-in completions for 1000+ commands ([full list](https://github.com/sigoden/argc-completions/blob/main/MANIFEST.md))
* Automatically generate completion noscript from help-text/man-page
* Lazy completing, lower memory consumption and faster startup time
source code: [https://github.com/sigoden/argc-completions](https://github.com/sigoden/argc-completions)
https://redd.it/1811o8n
@r_bash
Get log entries after specific date and time
I'm currently getting the last 4 lines of the log with
----------------------------------------
Current date/time: 2023-11-22 17:39:52
Last boot date/time: 2023-11-22 17:27:43
----------------------------------------
2023-11-22T16:30:01+11:00 foo bar
2023-11-22T16:30:01+11:00 foo bar
2023-11-22T17:34:07+11:00 foo bar
2023-11-22T17:34:07+11:00 foo bar
What I want to do is only show log entries containing "foo" that have a date/time later the last boot date/time.
This is the actual code I'm currently using:
printf -- '-%.0s' {1..40} && echo
echo "Current date/time: $(date +"%Y-%m-%d %T")"
echo "Last boot date/time: $(uptime --since)"
booted="$(uptime --since | cut -d":" -f 1-2)"
printf -- '-%.0s' {1..40} && echo
grep nvme /var/log/synoscgi.log | tail -20
​
https://redd.it/1813f7c
@r_bash
I'm currently getting the last 4 lines of the log with
grep foo /var/log/foobar.log | tail -4----------------------------------------
Current date/time: 2023-11-22 17:39:52
Last boot date/time: 2023-11-22 17:27:43
----------------------------------------
2023-11-22T16:30:01+11:00 foo bar
2023-11-22T16:30:01+11:00 foo bar
2023-11-22T17:34:07+11:00 foo bar
2023-11-22T17:34:07+11:00 foo bar
What I want to do is only show log entries containing "foo" that have a date/time later the last boot date/time.
This is the actual code I'm currently using:
printf -- '-%.0s' {1..40} && echo
echo "Current date/time: $(date +"%Y-%m-%d %T")"
echo "Last boot date/time: $(uptime --since)"
booted="$(uptime --since | cut -d":" -f 1-2)"
printf -- '-%.0s' {1..40} && echo
grep nvme /var/log/synoscgi.log | tail -20
​
https://redd.it/1813f7c
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
Oh-My-Zsh HYPHENINSENSITIVE option in Bash
Hi, I've searched both in this sub as well as on the interwebs but I was not able to find a solution.
As the noscript says, is there a way to have the HYPHENINSENSITIVE omz option in Bash?
What it does is that, if you have a file called
Thanks in advance!
https://redd.it/1817cgn
@r_bash
Hi, I've searched both in this sub as well as on the interwebs but I was not able to find a solution.
As the noscript says, is there a way to have the HYPHENINSENSITIVE omz option in Bash?
What it does is that, if you have a file called
some_file, you can type some- then hit TAB and it will be auto-completed to some_file, something I find to be very handy and also speeds up my work in the terminal.Thanks in advance!
https://redd.it/1817cgn
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
Self-updating, Discord installer noscript, for Debian Based OS's
The flow of the noscript is shown below.
1. If an update is detected, update the master and download noscripts using sed.
2. If no update is detected, keep the master and download noscripts the same.
3. Once steps 1 or 2 are satisfied, run the download noscript to install the latest version of Discord.
4. Once step 3 is completed, delete the leftover download noscript.
5. Rinse and repeat as desired.
Again, the master noscript will also auto-update itself to the latest version.
Let me know what you guys think. It seems to run well but I love learning more efficient ways of doing things. So please, if you have some good advice do share!
GitHub - install-discord.sh
https://redd.it/18190ag
@r_bash
The flow of the noscript is shown below.
1. If an update is detected, update the master and download noscripts using sed.
2. If no update is detected, keep the master and download noscripts the same.
3. Once steps 1 or 2 are satisfied, run the download noscript to install the latest version of Discord.
4. Once step 3 is completed, delete the leftover download noscript.
5. Rinse and repeat as desired.
Again, the master noscript will also auto-update itself to the latest version.
Let me know what you guys think. It seems to run well but I love learning more efficient ways of doing things. So please, if you have some good advice do share!
GitHub - install-discord.sh
https://redd.it/18190ag
@r_bash
GitHub
noscript-repo/Bash/Installer Scripts/SlyFox1186 Scripts/install-discord.sh at main · slyfox1186/noscript-repo
Contribute to slyfox1186/noscript-repo development by creating an account on GitHub.
Bash noscript to connect external m.2 on pi 5
Hi,
I'm running emby media server (https://emby.media) in docker on a pi 5.
The pi5 OS is usb boot, the media is on two m.2 drives in caddies, one 1TB the other 2TB.
The issue is that (despite being in fstab), the 2TB btrfs drive needs manually unplugging / replugging to be mountable upon reboot.
Naturally, this sucks. So, I wrote a small bash noscript to emulate unplugging/replugging by turning the power off/on the USB port (the docker container is just named 'embyserver', the 2TB caddy is Ugreen).
The noscript seems to do what I want, but the drive isn't mountable - perhaps despite the reporting, uhubctl isn't really powering the port off/on due to incompatibility?
Any alternative ideas?
https://redd.it/181irjl
@r_bash
Hi,
I'm running emby media server (https://emby.media) in docker on a pi 5.
The pi5 OS is usb boot, the media is on two m.2 drives in caddies, one 1TB the other 2TB.
The issue is that (despite being in fstab), the 2TB btrfs drive needs manually unplugging / replugging to be mountable upon reboot.
Naturally, this sucks. So, I wrote a small bash noscript to emulate unplugging/replugging by turning the power off/on the USB port (the docker container is just named 'embyserver', the 2TB caddy is Ugreen).
#!/bin/bashpath=/mnt/2tbhub=$(uhubctl | grep -B1 Ugreen | head -1 | awk {'print $5'})port=$(uhubctl | grep Ugreen | awk {'print $2'}|cut -d ':' -f1) mounted=$(cat /proc/mounts | grep $path)if [[ -z "$mounted" ]]; then# how to select on vendor anyway?uhubctl -l $hub -p $port -a 0 sleep 2uhubctl -l $hub -p $port -a 1 sleep 5 mount /mnt/2tbsleep 2docker restart embyserverfiThe noscript seems to do what I want, but the drive isn't mountable - perhaps despite the reporting, uhubctl isn't really powering the port off/on due to incompatibility?
Any alternative ideas?
https://redd.it/181irjl
@r_bash
Emby
media server for personal streaming videos tv music photos in mobile app or browser for all devices android iOS windows phone appletv androidtv smarttv and dlna
How to use the getopts builtin with optional arguements.
Hi all, I'm working on a bash-only noscript (that you'll likely see posted here in a bit), and wanted to use
So (assuming the noscript is name getopts.sh), running
will return
EDIT: I threw in some comments giving a bit more of an explination.
https://redd.it/182e35x
@r_bash
Hi all, I'm working on a bash-only noscript (that you'll likely see posted here in a bit), and wanted to use
getopts with optional arguements. this question was asked on stack overflow, but the top answer seemed overly verbose/unclear, so I thought I'd share my solution. It meerly requires two tests at the start of processing, and then checking wether OPTARG is null or not for the respective arguement. The only 'gotcha' is that you can't use arguements that start with a dash.#! /bin/bash
while getopts ':abc:d:f' opt; do # use silent reporting with a ':' at the start of `optstring`
if [[ $opt == ':' ]]; then
# `opt` is set to ':' if an option is missing a specified argument
# and `OPTARG` is set to the option with a 'missing' argument
opt="$OPTARG"
unset OPTARG
elif [[ $OPTARG =~ ^- ]]; then
# unless the option with a potential argument comes last, this is needed to filter
# out any following options
((OPTIND--))
unset OPTARG
fi
#shellcheck disable=SC2220
case "$opt" in
a)
echo "opt: a"
;;
b)
echo "opt: b"
;;
c)
#echo "opt: c"
if [[ -z $OPTARG ]]; then
C="Hello there."
else
C="$OPTARG"
fi
;;
d)
#echo "opt: d"
if [[ -z $OPTARG ]]; then
D="efault."
else
D="$OPTARG"
fi
;;
f)
echo "opt: f"
;;
esac
done
echo "$C"
echo "$D"
So (assuming the noscript is name getopts.sh), running
$ ./getopt.sh -c -d "General Kanobi!"
will return
Hello there.
General Kanobi!
EDIT: I threw in some comments giving a bit more of an explination.
https://redd.it/182e35x
@r_bash
Stack Overflow
Optional option argument with getopts
while getopts "hd:R:" arg; do
case $arg in
h)
echo "usage"
;;
d)
dir=$OPTARG
;;
R)
if [[ $OPTARG =~ ^[0-9]+$ ]];then
level=$...
case $arg in
h)
echo "usage"
;;
d)
dir=$OPTARG
;;
R)
if [[ $OPTARG =~ ^[0-9]+$ ]];then
level=$...
Kill, an interactive bash-only noscript for killing processes/sending signals.
Small, interactive, bash-only noscript I made that (naturally) uses the 'kill' builtin. Apart from sending signals, it can also list the environment of a selected process sans 'LSCOLORS' (as the value of LSCOLORS is generally not helpful and is visually distracting). All you need to do is clone it and make it executable:) Link: https://github.com/unsigned-enby/Kill
https://redd.it/182hvgp
@r_bash
Small, interactive, bash-only noscript I made that (naturally) uses the 'kill' builtin. Apart from sending signals, it can also list the environment of a selected process sans 'LSCOLORS' (as the value of LSCOLORS is generally not helpful and is visually distracting). All you need to do is clone it and make it executable:) Link: https://github.com/unsigned-enby/Kill
https://redd.it/182hvgp
@r_bash
GitHub
GitHub - unsigned-enby/Kill: Small bash-only noscript for killing processes/sending signals
Small bash-only noscript for killing processes/sending signals - GitHub - unsigned-enby/Kill: Small bash-only noscript for killing processes/sending signals
How to process only a specific input file with AWK?
I am trying to write a AWK noscript for some data processing and I am passing 3 input files to it. I am trying to figure out how to process only the third input file at a certain point of the noscript so I can create an array called compare. I have a for loop that looks for protocols in a topprotos array , so there will be about 10 protocols in that array. Lets name them proto1 , proto2 , proto3 and so on...My 3rd input file has 4 fields in each line, first being a protocol and third being a value. fields 2 and 4 aren't relevant. But what I want to do is loop through the topprotos items and find lines in this file where the first field matches. So if we do "for protocol in topprotos" and protocol in this iteration is proto5 , I want to look for the lines in my 3rd input file that have the first field as "proto5" , now all these lines that match have the 3rd field value , I want to sum all these values together and then append it to compare. So for each iteration I will have something like compare[protocol\] += $3 , and if you do a print of something like "print protocol " " compare[protocol\]" in the loop after appending you should see all the iterations with there values like this.
proto1 200
proto2 400
proto3 100
proto4 500
proto5 230
​
and so on...
here is a pastebin to my code https://pastebin.com/THfm6qfj
if anyone could help me I would really appreciate it !!!
https://redd.it/182xeng
@r_bash
I am trying to write a AWK noscript for some data processing and I am passing 3 input files to it. I am trying to figure out how to process only the third input file at a certain point of the noscript so I can create an array called compare. I have a for loop that looks for protocols in a topprotos array , so there will be about 10 protocols in that array. Lets name them proto1 , proto2 , proto3 and so on...My 3rd input file has 4 fields in each line, first being a protocol and third being a value. fields 2 and 4 aren't relevant. But what I want to do is loop through the topprotos items and find lines in this file where the first field matches. So if we do "for protocol in topprotos" and protocol in this iteration is proto5 , I want to look for the lines in my 3rd input file that have the first field as "proto5" , now all these lines that match have the 3rd field value , I want to sum all these values together and then append it to compare. So for each iteration I will have something like compare[protocol\] += $3 , and if you do a print of something like "print protocol " " compare[protocol\]" in the loop after appending you should see all the iterations with there values like this.
proto1 200
proto2 400
proto3 100
proto4 500
proto5 230
​
and so on...
here is a pastebin to my code https://pastebin.com/THfm6qfj
if anyone could help me I would really appreciate it !!!
https://redd.it/182xeng
@r_bash
Pastebin
awk -F, -v hour="$4" -v tgtdate="$5" -v variance=50 ' (NF==2) { - Pastebin.com
Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.
emulating the full functionality of the history command with arrow key navigation within bash noscript
I am looking for a constant interactivity within a noscript allowing me as user to navigate and execute previous commands by using arrow keys. I have tried read and select but no way I get the history feature with arrow keys as we have in the bash shell. Any indea what command I can use? Thanks
https://redd.it/183a4qm
@r_bash
I am looking for a constant interactivity within a noscript allowing me as user to navigate and execute previous commands by using arrow keys. I have tried read and select but no way I get the history feature with arrow keys as we have in the bash shell. Any indea what command I can use? Thanks
https://redd.it/183a4qm
@r_bash
Reddit
From the bash community on Reddit
Explore this post and more from the bash community
Help choosing Bash alias and function names that WON'T come back to bite you later!
https://github.com/makesourcenotcode/name-safe-in-bash
https://redd.it/183blrk
@r_bash
https://github.com/makesourcenotcode/name-safe-in-bash
https://redd.it/183blrk
@r_bash
GitHub
GitHub - makesourcenotcode/name-safe-in-bash: Help choosing Bash alias and function names that WON'T come back to bite you later!
Help choosing Bash alias and function names that WON'T come back to bite you later! - GitHub - makesourcenotcode/name-safe-in-bash: Help choosing Bash alias and function names that WON&...