grep: warning: stray \ before /

I am trying to run this noscript.

#!/bin/sh


movie=$(curl -s https://1337x.to/search/$query/1/ | grep -Eo "torrent\/0-9{7}\/a-zA-Z0-9?%-/" | head -n 1)
magnet=$(curl -s https://1337x.to/$movie | grep -Po "magnet:\?xt=urn:btih:[a-zA-Z0-9]" | head -n 1)
peerflix $magnet -l -v


I get the error of grep: warning: stray \\ before / . I have tried to get rid of the \\ before the /. This did not work. Can anyone help me?

https://redd.it/z2vfx0
@r_bash

How to pass an associative array to another noscript

I want to pass an associative array in noscript1.sh to noscript2.sh. Here is what I have:

noscript1.sh:

declare -A queues
queues=( "key1"="value1" "key2"="value2" "key3"="value3" "key4"="value4" )

call noscript2:
noscript2.sh "$param1" "$param2" "$param3" "${queues@}"

noscript2.sh:

arg1=$1
arg2=$2
arg3=$3
declare -A arg4=$4

The associative array in noscript1 is fine. I can loop through the array and see its elements. However, when I tried to pass it to noscript2.sh, I can't see any of the elements in arg4. Thanks in advance.

https://redd.it/z2xyv5
@r_bash

Need help with sed and variables

Hi Everyone,

I've put together a sed for vnstat xml output for my openwrt router. (trying to get a cleaner output) My sed works if I have the year (2022) and month (11) in the sed command. When I replace 2022 with $y and 11 with $m, it doesnt work, no change in the output, like it doesn't recognize it.

​

The file looks like this:

2022 11 21 05:00 474322562 15172268
2022 11 21 06:00 536016232 651897033
2022 11 21 07:00 184569685 109642704

Here is what works (without the variables, just normal ):

vnstat --xml |grep -hnr "hour id" | sed "s/<^>>/ /g; s/2022//g; s/ //g; s/ 00/:00/g; s/11 /11-/g" | cut -d " " -f2- > houroutput.xml

-----------------------------------------------
and the output looks good:
11-21 05:00 474322562 15172268
11-21 06:00 536016232 651897033
11-21 07:00 184569685 109642704

&#x200B;

my noscript looks like with the variables in sed, I even replaced the single quotes with double, but no change in output.

#!/bin/sh
y="date +%Y"
m="date +%m"

vnstat --xml |grep -hnr "hour id" | sed "s/<[^>]>/ /g; s/$y//g; s/ //g; s/ 00/:00/g; s/$m /$m-/g" | cut -d " " -f2- > houroutput.xml

Output doesnt look good:
2022 11 21 05:00 474322562 15172268
2022 11 21 06:00 536016232 651897033
2022 11 21 07:00 184569685 109642704

https://redd.it/z31cfq
@r_bash

Somewhat probably generic post

What's your personal 'ah ha' moment when getting into learning bash? What made you think, "oh damn I need to know this"

https://redd.it/z3riln
@r_bash

my first semi noob noscript - Loop through list of trackers and test if they are alive using nc
https://gist.github.com/neuthral/0ff41380958321d69888fead29d510ee

https://redd.it/z3rcka
@r_bash

read contents of a file into a variable with bash without invoking other commands?

Is there some internal bash way to do this?

x=$(cat /proc/uptime)

And i am not thinking about the line-by-line "while read l; do bla bla; done < file" (for various reasons).

https://redd.it/z3ue97
@r_bash

I've been working on this CLI tool to automate creation of noscript files, modification of file permissions, and input typical text. I spend a lot of time in the command line for work, but consider myself still learning noscripting. If you have any input I'd appreciate it!
https://redd.it/z4hi9r
@r_bash

Sorting by size with ls -S and reading each first line of .txt files

So i have this task to sort .txt files by size and then reading the first line of each of them and displaying them

i do know that i can sort by size with ls -S

also for the reading and displaying part

for i in *.txt; do head -n 1 $i; done

problem is that if i put ls -S | before this ... it doesnt work .. like i get the output but its not sorted by size

i do know that there is an awk command, tried with that either, but i cant use it as its for class and we just started with bash so we have to stick to the .. "basics"

https://redd.it/z4mvws
@r_bash

Having trouble with a bash user creation noscript for homework

The bash noscript pulls some stuff out of a csv file (firstname, lastname, dob, group)

I can get that stuff into an array, but when I try to massage the data in the array, it tries to run one of the variables as a command.
Can someone tell me what I'm doing wrong?




\#!/bin/bash

\#set -x

testdata="/home/diana/testdata.csv"

declare -a fnames

declare -a lnames

declare -a dob

declare -a course

while IFS="," read -r Student_Firstname Student_Lastname Student_BirthDate Course_Data trash;

do

fnames+=("$Student_Firstname")

lnames+=("$Student_Lastname")

dob+=("$Student_BirthDate")

done<$testdata

\## usernames[index\]= ${fnames[index\]::1}${lnames[index\]} | tr [:upper:\] [:lower:\]

for index in "${!fnames[@\]}";do

\#this next line tries to "run" the username.
usernames= "${fnames[index\]::1}${lnames[index\]} | tr [:upper:\] [:lower:\]"

\# echo ${fnames[index\]::1}${lnames[index\]} | tr [:upper:\] [:lower:\]

\# echo ${fnames[index\]::1}${lnames[index\]::1}${dob[index\]} | tr [:upper:\] [:lower:\]

\# echo $usernames

\#printf ${fnames[index\]}

done

https://redd.it/z4niaz
@r_bash

Cron job for shell noscript not running

https://stackoverflow.com/questions/74577211/cron-job-for-shell-noscript-not-running

Full/detailed q in stack overflow above.

tl;dr cannot get my cron job to successfully execute a shell noscript, nor can I seem to get it to format as intended, despite the noscript working when called manually and absolute paths used for everything.

https://redd.it/z4mj18
@r_bash

Help with creating a noscript for transcoding files located in subdirectories with FFMPEG

Hi. I'm trying to write a noscript that locates all video files (.mkv in this case) from subdirectories, transcodes them with FFMPEG to HEVC, and stores the output in another HDD, **preserving the directory tree**.

**Example:**

I want to transcode /videos/pets/cats.mkv to HEVC and store the output inside /hdd2/pets/cats\_hevc.mkv

This is the noscript that I currently have, but it doesn't preserve the directory structure nor search in subdirectories (I tried to use 'find' but I couldn't create new folders in the output location):

#! /bin/bash
for file in *.mkv;
do
ffmpeg -i "$file" -pix_fmt yuv420p10le -map 0:v -map 0:a -c:v libx265 -crf 21 -preset slow -c:a aac -b:a 128k "/path/to/output/directory/${file%.*}_hevc.mkv";
done
echo "Conversion complete!"

How can I do that? I've been trying for hours but couldn't find a way to make it work.

Thanks.

https://redd.it/z4qa0n
@r_bash

Master the command line, in one page
https://github.com/jlevy/the-art-of-command-line

https://redd.it/z4zcy5
@r_bash

Help with Bash homework, convert Uppercase to Lowercase in txt file

Hello, I have to write a line of simple Bash code to convert every Uppercase letter to lowercase in a .txt file.

Can anyone help?

https://redd.it/z5302q
@r_bash

no way to record PWD in the bash history i guess?

I want a better history, and did this


export HISTTIMEFORMAT="%F%H:%M:%S [$sshkeycomment] "

$ssh\key_comment is figured out in a profile.d noscript and simply contains the ssh key comment of the key of the person that logged in (via ssh...). Or contains "n/a".

I can see that the timestamps are now recorded as a #-comment in .bash_history.

Its just one thing missing, would be nice to see the current PWD where the comment was entered.
Adding $PWD to HISTTIMEFORMAT doesnt work because thats simply not recorded in the history.

Might there be a trick to get it recorded anyway? :)
Cant see any way from the man page...

https://redd.it/z583sh
@r_bash

My PS1 variable breaks shell completely [Help fix it]
https://redd.it/z57hpm
@r_bash

How do I validate user inputs to numbers only?

https://redd.it/z5dco1
@r_bash

social nets from bash lynx

m.facebook.com worked for me in 2021. gmail stopped working early 2021 because of javanoscript, tho had used html mode a decade. a coupla years ago linkedin kept trying to catchpa me but despite scp failed. have seen bash noscripts for twitter and reddit but never worked. anyone care to give a general status report with urls?

https://redd.it/z5jr1y
@r_bash

Pulling information about processes from /proc/pid/stat

Hi, I need to display information about all running processes (pid, ppid) from /proc/pid/stat. Any tips how to get around this?

https://redd.it/z5yxu4
@r_bash

How to log bash commands in some simple way?

I would like to log bash commands to a log file. Seems easy enough, but i have searched and searched and not found a simple and sufficient method.

It seems like this should be possible by hooking in to some bash function/variable, but there is always something missing:/

I tried enhancing the history a bit here https://www.reddit.com/r/bash/comments/z583sh/no\_way\_to\_record\_pwd\_in\_the\_bash\_history\_i\_guess but that failed.
Sorry for that untested post by the way.

The utility "noscript" almost seems good enough, but for some reason there is no way to get a timestamp for each command!? (or is there?)
(i have seen solutions where the output of noscript is piped through for instance 'ts', but i would really like to avoid too many sub-processes and pipes and stuff, that will just cause problems later on).

I saw one solution where PROMPT_COMMAND was used together with "history | tail -n", but that wont work when commands take long to complete. The timestamp will be when the command finished...

Basically i would like to log like this

>2022-11-27 12:00 [user\] [env-var\] [cwd\] the command...

Where 'env-var' could be any variable from the environment.

Is there really no way to just get bash to execute some function that gets the input passed as arguments each time a command is executed?

Sorry for posting yet another of these questions. I have found many many questions kinda like this, but really strangely enough no simple and satisfactory solutions.

https://redd.it/z6119l
@r_bash