How do I open a dir/filename with cat command?

For simplicity: I have a directory that contains two things: a setup noscript file, and another directory containing a text file with VS Code extensions, one per line. The paths to the two files would be:

~/Downloads/noscripts/setupnoscript

~/Downloads/noscripts/VSCode/extensions.txt

I have this line in the setup noscript from this superuser topic:

cat VSCode/extensions.txt | xargs -n 1 code --install-extension

I get No such file or directory errors when I run this line; despite trying a number of ways to get it to recognize the file like different path prefixes (/, ./, ../) and even putting extensions.txt in the same directory as setupnoscript. Where am I going wrong?

https://redd.it/13ym85l
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Script to simply read value give a not found error ?

Hi

I have a quite simple noscript and somehow i can't figure how to fix it.. It give me a not found all the time. If some do see the point...

nano /sbin/tempcpunotif.sh

#!/bin/bash

while true; do

val=$(sensors | awk '/temp1/ {print $2}')

max="+75.0"

if [[ "$val" > "$max" ]]; then

systemctl suspend

fi

sleep 10

clear

sensors

done

exit 0

​

Or i try with a simpler one, but not sure as i told me the temp is not found..:

​

#!/bin/sh

# Threshold for when to send alert

threshold=75000

​

#sensors | grep -e "Package id 0" | while read line; do

cat /sys/devices/platform/coretemp.0/hwmon/hwmon1/temp1_input | while read line; do

temp=$(echo $line | awk -F "+" '{ print $2 }' | awk -F "." '{ print $1 }');

if (( temp > $threshold )); then sh /sbin/tempnotif.sh

fi;

done

​

Thanks in advance

https://redd.it/13yswnh
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woman - Preview list for man documents
https://gist.github.com/thingsiplay/f71383569c10da17f772b9967f5a5767

https://redd.it/13z41ji
@r_bash

What is this command?

I have a noscript that should run only when certain directory exists. It begins like that:

-d /home/path/to/directory &&

I found that example somewhere and it works, but I don't understand what these brackets really do. Is it correct way?

https://redd.it/13z8dfl
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Curious Bash: Get Notified When It's Done
https://blog.carlolobrano.com/posts/2023-06-02-curious-bash-get-notified-when-done/

https://redd.it/13zj9ly
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Run a noscript into a new "less" istance then go back to the normal shell when the noscript has finished

Scenario: I want run a noscript into a terminal window, but to keep this window "clean" (ie I want to display only START and FINISHED) I want to display all the outputs into a clean space (like into the "less" command or even by opening it in "xterm"), then when the noscript has finisced I want to come back to the terminal window, automatically, so without having to press a key (like Q in "less"). All I want to see on that window is START and FINISCED! Nothing more. How should I do? I'm going mad!

https://redd.it/13zo2g6
@r_bash

Idempotent mutation of PATH-like env variables

It always bothered me that every example of altering colon-separated values in an environment variable such as PATH or LD_LIBRARY_PATH (usually by prepending a new value) wouldn't bother to check if it was already in there and delete it if so, leading to garbage entries and violating idempotency (in other words, re-running the same command WOULD NOT result in the same value, it would duplicate the entry). So I present to you, prepend_path:

# function to prepend paths in an idempotent way

prependpath() {
local dir="${1%/}" # discard trailing slash
local var="${2:-PATH}"
if [ -z "$dir" ]; then
echo "Usage: prependpath <pathtoprepend> name_of_path_var" >&2
return 2 # incorrect usage return code, may be an informal standard
fi
local newvalue=${!var}
[ $newvalue =~ ^$dir: ] && return # quit if value already starts with $dir
newvalue=${newvalue%:$dir} # remove $dir from end of path
newvalue=${newvalue//:$dir:/:} # remove $dir from middle of path
# prepend the new entry
export ${var}="$dir:$newvalue"
}

Usage examples:

prependpath $HOME/.linuxbrew/lib LDLIBRARYPATH
prependpath $HOME/.nix-profile/bin

Note that of course the order matters; the last one to be prepended that matches, triggers first, since it's put earlier in the PATHlike. Also, due to the use of some Bash-only features (I believe) such as the ${!var} construct, it's only being posted to /r/bash =)

EDIT: code modified per /u/rustyflavor 's recommendations, which were good. thanks!!

https://redd.it/13zmp3w
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How to recursively rename photographs/videos to their respective folder name

To preface, I'm very new to bash. I have several thousand photographs and videos that I imported from Photos (macOS) and they were stored in folders based on their date. I'm not on Fedora and using gThumb and I cannot view all of my photographs/videos at once since there are so many sub-folders. I'd like to have them all in one folder, but still organized. So, as the noscript states, I'd like help writing a noscript that could recursively scan a directory (including one tier of sub-folders) and rename each photograph/video to the respective directory. Even better if it could remove any alphabetical letters.

Here's an example of a directory: Christmas Eve, December 24, 2018

Here's an example of what I'd like the files to be named: 12-24-2018 (1), 12-24-2018 (2), etc.

This way all of my photographs/videos could be stored in one folder.

Here's something I had tried:

#!/bin/bash

for i in ~/Pictures/*/*.png;

do $parentFolder = dirname $i;

mv $i $parentFolder.png;

echo "Renamed $i to $parentFolder.png";

done

It obviously doesn't work, but I'd appreciate any help in fixing my errors.

https://redd.it/13zuyrj
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Shell Scripting Tutorial
https://www.shellnoscript.sh/

https://redd.it/140hz7l
@r_bash

these lines causing errors but I swear they weren't causing error before and I didn't change anything

i=0
while read l
do
varr=$(printf "$l" | awk --field-separator="|" "{ print NF }" )
"$varr" -eq 2 || "$varr" -eq 4 || i=$((i+2))

done < file

the error is this

[: Illegal number:

https://redd.it/140q88d
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Dispatcher does nothing on my machine?

I am using this commonly known noscript which isn't working for me at all. As in, no output and no changes in WiFi status:

&#x200B;

#!/bin/bash

enabledisablewifi ()
{
result=$(nmcli dev | grep "ethernet" | grep -w "connected")
if -n "$result" ; then
nmcli radio wifi off
# echo "off"
else
nmcli radio wifi on
# echo "on"
fi
}

if "$2" = "up" ; then
enabledisablewifi
fi

if "$2" = "down" ; then
enabledisablewifi
fi

This is my output of "nmcli dev | grep "ethernet" | grep -w "connected"

enp52s0f3u1u3u4 ethernet connected My Ethernet

What am I doing wrong? :o

https://redd.it/1414kpb
@r_bash

npid - Get name of process by pid
https://github.com/thingsiplay/npid

https://redd.it/141fs84
@r_bash

printf not completely converted

numbers="50 75"

thistime=$(( $(date +%s)+$(printf '%d' "$numbers" | awk '{print $1}') ))

printf: 50 75: not completely converted

&#x200B;

thisTime should be equal to the current time in seconds (since 1970) + 50

https://redd.it/141ly34
@r_bash

#!/usr/bin/bash -eu

Can someone explain what the -eu means in this example please?

I see it mostly at the beginning of shell noscripts, etc.

Thanks.

https://redd.it/141ry2f
@r_bash

awk just printing what I want it to append in the console instead of actually appending it

awk -v mynum="$(mynumber)" -F ',' 'NF==2{print $0" , -5 , mynum , 3 "}' file

so if there is one comma on a line, it should turn

a ,b

to

a , b , -5, mynum , 3

I don't understand why this doesn't work

https://redd.it/141xsra
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Terminal acts sporadic at times

If I run a command $ while ! ping -c 1 -W 1 1.1.1.1; do echo "still waiting for 1.1.1.1" sleep 1 done and I recall it with the up arrow or I recopy and paste it, the order of the command comes up in a weird order and there is no dollar sign preceding the command like such still waiting for 1.1.1.1" sleep 1 done while ! ping -c 1 -W 1 1.1.1.1; do echo ". Also when I press backspace, it clears what I inputted but then it continues to clear what I've entered previously in "history", the backspace doesn't stop at the end of the line, it continues onto the previous lines (as if the screen is a giant txt file). I've had this issue come up in git bash as well. When I reopen my terminal this issue is resolved. It seems like a common issue and I've entered some sort of mode but I don't know how to fix it besides restarting the terminal. Any help would be appreciated.

https://redd.it/141xccx
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I made a better bashmarks

So, I was trying to find a good directory bookmarking utility for terminal use, so I can cd faster and also build other noscripts around it too. I didn't find anything satisfactory. The closest thing was bashmarks, but I didn't like the way it was written and it worked. It already had done a lot of the groundwork for me and it was a good basis to start, so I decided to fork it and work from there.

And that's what I did. I also decided to make it POSIX compliant so it works with /bin/sh and dash for speed or whatever. Took me a few hours as I'm not great at shell noscripting. If anyone wants to check it out, here's the github repo.

In my opinion, which is correct, it is better than bashmarks because it doesn't hijack the possible one character aliases one might personally want to make, it also doesn't require the user to source the noscript in their bash or zsh config, and it doesn't work using environment variables like bashmarks does. It's easy to combine with a program like dmenu or fzf to choose from the list of available bookmarks as well. It also does thorough error checking, and extends the noscripts functionality. With my noscript you are able to print or delete multiple bookmarks at once, and set a new bookmark using the current working directory, or pass one as an argument.

Anyway, if you want to try a faster way to travel between commonly CDed dirs, then give it a try.

https://redd.it/142460x
@r_bash

My bash noscript work manually, but in crontab does not work

I have this shell noscript

#!/bin/bash

userendpoints=`cat user.log |cut -d '|' -f5|jq '.request.address'|sed -e 's|upload|\nupload|g'|grep -v upload|sort |uniq`


IFS=$'\n'

echo "endpoint|count|type of response"
for i in $userendpoints
do
data=cat user.log|grep "$i"|cut -d '|' -f5|jq '.response.status'|sort|uniq -c|sed -e 's/$/|/g' -e 's/ //g' -e 's/^ //g'
for d in echo $data|tr '|' '\n'
do
echo "$i" "|" echo $d|sed -e 's/^ //'|tr -s ' ' '|'
done
done



serviceendpoints=` cat service.log |cut -d '|' -f5|jq '.request.address'|sed -e 's|compare|compare\n trunk|g' -e 's|livenessCheck|livenessCheck\n trunk|g'|grep -v trunk|sort |uniq`


for i in $serviceendpoints
do
data=cat service.log|grep "$i"|cut -d '|' -f5|jq '.response.status'|sort|uniq -c|sed -e 's/$/|/g' -e 's/ //g' -e 's/^ //g'
for d in echo $data|tr '|' '\n'
do
echo "$i" "|" echo $d|sed -e 's/^ //'|tr -s ' ' '|'
done
done


when I run this shell noscript manually it work and give me result, but when I put it in crontab I see this error and does not give us result and I see this error


cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: user.log: No such file or directory
cat: service.log: No such file or directory
cat: service.log: No such file or directory
cat: service.log: No such file or directory
cat: service.log: No such file or directory
cat: service.log: No such file or directory

I use oracle Linux.

https://redd.it/1429m19
@r_bash

I have developed my own Appimage package manager in full BASH, here are 3 different approuches to install the apps: xterm (1, the default one, allows to interact when prompted questions), less (2, clean but non interactive) or nothing (not clean). What is better? Have you got suggestions?

https://redd.it/142d9nx
@r_bash

Add timestamp to stderr redirect

I'm running a noscript on my machine that displays a bunch of junk as it runs. I pipe that junk into /dev/null because I don't care what it says and I capture any errors in a file (I only care if the noscript doesn't run), however, the errors don't come with a time stamp. Is there a way to append a timestamp to the stderr redirect? This is the command I have, but can't figure out how to add the timestamp:

myScript.sh 2>> logfile.txt 1>/dev/null

I can't modify myScript.sh to print a date so that's not an option either. I tried something like this:

myScript.sh 2>> logfile.txt << date

but that doesn't work.

https://redd.it/142fbfs
@r_bash

Temporary symlink in shell - "named process substitution" - rename a file without creating a copy/symlink on the disk?

Thunderbird doesn't open files that don't have .eml extension as email files, but instead starts to compose a new message and adds them as attachments. To use thunderbird in noscripts I'm looking for a way that would allow you to "temporarily rename" a `file` as a `file.eml`, open it in thunderbird (possibly edit, but at least read) and close it without saving anything to the disk.

While this could be achieved by either copying or creating a symlink to that file there are many elegant ways to use process substitution or here strings that instead create "temporary files" that live only for duration of the process.

Is there anything that could create such "pseudo symlinks" in bash/zsh?

https://redd.it/142srw1
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