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
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
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 script 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
grep not finding anything in csv log file
Hi,
I have a CSV file that when I run the grep command, it doesn't find any matches in it. However, when I copy the text from a specific cell (eg: Message in column) of the CSV into another TXT file, grep works perfectly searching for the word "TEST".
I've read about using the param -a with grep but it didn't work.
Grep man explanation:
-a, --text Process a binary file as if it were text; this is equivalent to the --binary-files=text option.
Notes: when I do cat mylog.log.csv it doesn't appear to be a comma separated csv, I think it's separated by tabs. When I open it using excel it shows all ordered by columns.
​
If you print cat mylog.log.csv it outputs like this
��TimeStamp Component Severity Message Source Type Message Thread ID Source File Name Source Line Instance ID Msg ID App Area Business Obj BO ID Customized
2023-11-08 13:31:11.840349 Sql Note I Tec "ExecuteQueryDirect #Duration=911 #Fetched=7 #Query select columnname, datatypename, ISNULLABLE, length, length as precision, scale from sys.viewcolumns where schemaname = 'SYSBIC' and viewname = 'sap.test.TESTVIEW/TESTVIEW' order by position #Status=1 # #" TID=5956 ../Infrastructure/Engines/DBM/DBMCDataBase.cpp 10110
I read it could be something related to \\r so people recommended to use cat -A and it outputs weird formatting like this
M-^?M-~T^@i^@m^@e^@S^@t^@a^@m^@p^@^I^@ ^@C^@o^@m^@p^@o^@n^@e^@n^@t^@^I^@ ^@S^@e^@v^@e^@r^@i^@t^@y^@^I^@ ^@M^@e^@s^@s^@a^@g^@e^@ ^@S^@o^@u^@r^@c^@e^@^I^@ ^@T^@y^@p^@e^@^I^@ ^@M^@e^@s^@s^@a^@g^@e^@^I^@ ^@T^@h^@r^@e^@a^@d^@ ^@I^@D^@^I^@ ^@S^@o^@u^@r^@c^@e^@ ^@F^@i^@l^@e^@ ^@N^@a^@m^@e^@^I^@ ^@S^@o^@u^@r^@c^@e^@ ^@L^@i^@n^@e^@^I^@ ^@I^@n^@s^@t^@a^@n^@c^@e^@ ^@I^@D^@^I^@ ^@M^@s^@g^@ ^@I^@D^@^I^@ ^@A^@p^@p^@ ^@A^@r^@e^@a^@^I^@ ^@B^@u^@s^@i^@n^@e^@s^@s^@ ^@O^@b^@j^@^I^@ ^@B^@O^@ ^@I^@D^@^I^@ ^@C^@u^@s^@t^@o^@m^@i^@z^@e^@d^@^M^@$
Example of some columns in log csv file:
|TimeStamp|Message|
|:-|:-|
|2023-11-08 13:31:11.865258|static void B1SLogHelper::Log(IHttpResponse*, const char*): === Response Detail === status:200 content-type:application/json;odata.metadata=minimal;charset=utf-8 content: { "@odata.context" : "https://an_endpoint:50000/b1s/v1/sml.svc/$metadata#TEST_VIEW", "value" : [ { "ItemCode" : "111111111111", "ItemName" : "TEST_VIEW", "id__" : 111 }, \], "@odata.nextLink" : "TEST_VIEW?$orderby=ItemName%20asc&$skip=5400" } # #|
Link to download or check the csv file https://drive.google.com/file/d/1uCS4Wmo\_ROrFDZ6JQcgVEISyRfW7S682/view?usp=sharing
https://redd.it/17yes57
@r_bash
HELP! Bash script wilding. Even GPT is stumped.
Hi there,
I've been modifying this script so that it uses grim and slurp to work on wayland. Now I've hit the road block. The output of the program (After modification) is:
Selected geometry: 1118,285 528x656
Screenshot command: grim -g "1118,285 528x656" /home/baighack3rss/Pictures/Screenshots\/1700230454.png
invalid geometry
Command exit status: 1
Now here is the interesting part. If I just copy the screenshot command and run it in the terminal it works but in the script it's an invalid geometry.
I've attached the script to this hastebin.
Thanks in advance!!
https://redd.it/17xg4k2
@r_bash
Wayland script that is equivalent to x11
Hi, I wrote a script for browser functionality. Is it possible to rewrite it to wayland? Thanks in advance!
Basically, what this script does:
If browser isn't open, it opens it
If browser is open, but not active, it activates it
If more than one browser window is open, it cycles between them
​
\#!/bin/bash
\#Needs wmctrl ,libnotify-bin, script x11 only
​
defaultBrowser=$(xdg-settings get default-web-browser -eq)
if [ "$defaultBrowser" = "brave-browser.desktop" \]; then
findName="Brave"
launchName="brave-browser"
fi
​
if [ "$defaultBrowser" = "firefox_firefox.desktop" \]; then
findName="Firefox"
launchName="firefox"
fi
OUTPUT=$(wmctrl -l | awk '{print $1, $NF}' | grep $findName | awk '{print $1}')
​
a=($(echo "$OUTPUT" | tr ' ' '\\n'))
aSize=${#a[@\]}
​
\# Check if array size is 0
if [ "$aSize" -eq 0 \]; then
$launchName &
notify-send -t 800 "Launching: $findName"
exit
elif [ "$aSize" -eq 1 \]; then
wmctrl -ia "${a[0\]}"
exit
elif [[ -z $(wmctrl -lp | grep "$(xprop -root | grep _NET_ACTIVE_WINDOW | head -1 | awk '{print $5}' | sed 's/,//' | sed 's/\^0x/0x0/')" | grep $findName) \]\]; then
wmctrl -ia "${a[0\]}"
exit
else
activeWindowID=$(wmctrl -lp | grep "$(xprop -root | grep _NET_ACTIVE_WINDOW | head -1 | \\
awk '{print $5}' | sed 's/,//' | sed 's/\^0x/0x0/')" | awk '{print $1}')
​
for i in "${!a[@\]}"; do
if [ "${a[i\]}" == "$activeWindowID" \]; then
index="$i"
if [ "$index" -eq "$((aSize - 1))" \]; then
index="0"
else
((index++))
fi
wmctrl -ia "${a[$index\]}"
exit
fi
done
fi
https://redd.it/17xebi9
@r_bash
New to bash and can't figure out array items
I have been beating my head against a wall about this for longer than I care to admit and am looking for a clue.
I am pulling all my budget names from AWS and storing them into a variable:
`budgets=$(aws budgets describe-budgets --account-id "$ACCOUNT_ID" | jq '.Budgets[].BudgetName')`
One big string that looks like this:
`"Market Accounts" "Scratch account" "DataScience Accounts" "Infrastructure Accounts" "Networking Accounts"` etc..
so I convert it to an array so I can use the items individually:
`budgets=($budgets)`
but when I run it through a for loop:
`for budget in "${budgets[@]}"; do echo $budget; done`
It doesn't treat the quoted groups as items and treats every space as a delimiter.
So I get this output for `echo "${budgets[0]}"`
`"Market`
but my desired output is:
`"Market Accounts"`
Full snippet:
budgets=$(aws budgets describe-budgets --account-id "$ACCOUNT_ID" | jq '.Budgets[].BudgetName')
budgets=($budgets)
for budget in "${budgets[@]}"; do echo $budget; done
It has to be simpler that all the things I have tried. Any help is greatly appreciated.
https://redd.it/17x4fsh
@r_bash
any tips why its not working?
if [[ $current_url != "${NGROK_REMOTE_URL}" \]\];
then
curl -s -X POST "https://api.telegram.org/botapi/sendMessage" -d "chat_id=secret" -d text=${NGROK_REMOTE_URL}
current_url=${NGROK_REMOTE_URL}
fi
https://redd.it/17wtqme
@r_bash
Making a matrix
Hey, everyone! I'm still fairly new to bash and don't exactly know how to solve this exercise we received for studying. If anyone could help me, I would really appreciate that. Here's the text:
You are tasked to create a simple program that emulates a cinema ticket reservation system for a cinema with a single screen and 100 seats organised in a 10x10 grid.
The seating arrangement should be presented to the user as a 10x10 grid. Each seat is identified by its position in the grid (e.g. the first seat is at position 0,0 and the last seat is position 9,9). For visual representation, the program should use 'A' for available seats and '_' for reserved seats.
The program should begin by displaying a greeting message to the user and the current seating map, where all seats are initially available. It should then prompt the user to enter a seat number to reserve. After the user provides a valid seat number, the program should reserve that seat and display the updated seating map. If the seat is already reserved, the program should inform the user and prompt them to choose another seat.
After reserving a seat and showing the updated seating map, the program should ask the user whether they want to reserve another seat. If the user decides to continue, the program should repeat the reservation process. Otherwise, it should end with a closing message.
Thanks in advance to anyone who's willing to help me with this exercise.
https://redd.it/17wj6s0
@r_bash
Getting Currently playing from Spotify_Player
Trying to use inotifywait to watch the album art file to see when spotify\_player changes tracks then adding now playing data to a txt file for other use.
My issue is that I am getting the LAST song that was played.... what am I doing wrong?
If I cat I get last song played... if I run the playerctl in a terminal it is currently playing.
(sleeping before the echo did not work)
album_art="$HOME/.cache/spotify_player/image"
metadata_file="$HOME/.local/tmp/spotify.txt"
inotifywait -m -e access "$album_art" | while read changed_file; do
echo "$(playerctl -p spotify_player metadata title)" > $metadata_file
done
​
https://redd.it/17w8iaz
@r_bash
jazz : through a marriage of jq and fzf, fuzzy select json input in terminal [homemade gist]
https://gist.github.com/grdscrc/2d0b0549f48950e12d0386bb0fbd8b4f
https://redd.it/17w065j
@r_bash
"if grep" is a bomb that we ignore
https://blog.ngs-lang.org/2023/11/07/if-grep-the-bomb/
https://redd.it/17vncx8
@r_bash
Is the -f in rm -rf a bit useless?
There's a lot of jokes about rm -rf but if the directory doesn't exist and you run rm -r, it would throw an error, no big deal.
But if it does exist and we run rm -r then it deletes the directory recursively. As a standalone command rm -rfdoesn't seem that much different from rm -r. So maybe I don't understand the joke about rm -rf but rm -r should be good enough? I mean we obviously can't delete something that doesn't exist and -f just suppresses that error message. The importance of -f seems to be overstated?
https://redd.it/17vgh0i
@r_bash
How to remove single new lines from the end of a line in a text file, but ignore double new lines
I have been tearing my hair out trying to process some text files that have too many new lines.
I have a text file that look s something like this:
The quick brown fox jumps Over the
lazy dog. The quick brown fox.
The quick brown fox
jumps over the lazy dog.
I want to remove the single newlines but ignore the doubles.
In a text editor I can find and place using regex like this:
Find: \n(?!\n) Replace with: <space>
But I have a bunch of files, so I’m looking for a way I can create a script to do it.
I’ve tried see/gsed, but it is ignoring my regular expressions, even with the -E option. Even a simple search for a newline fails:
sed -i -E 's/\n/ /g' test.txt
Does anyone have a solution?
Many thanks.
https://redd.it/17twwyv
@r_bash
Glassfish/payara domain restart project, any improvements you would say?
function domain_action() {
case $1 in
1)
echo "instruction received to start domain $2"
/home/techyman/glassfish4/bin/asadmin start-domain "$2"
;;
2)
echo "instruction received to stop domain $2"
/home/techyman/glassfish4/bin/asadmin stop-domain "$2"
;;
3)
echo "instruction received to restart domain $2"
/home/techyman/glassfish4/bin/asadmin stop-domain "$2" && /home/techyman/glassfish4/bin/asadmin start-domain "$2"
;;
esac
}
echo "What action do you want to perform? (1 for Start, 2 for Stop, 3 for Restart)"
read actionToPerform
echo "On which domains do you want to perform these actions?"
read -a arrayOfDomains
# https://stackoverflow.com/a/56146307/21719190
for domain in "${arrayOfDomains[@]}"; do
domain_action "$actionToPerform" "$domain"
#echo "$domain"
#https://ryanstutorials.net/bash-scripting-tutorial/bash-if-statements.php
#if [ "$actionToPerform" = "1" ]; then
# echo "Starting $domain"
# domain_action "$actionToPerform" "$domain"
#elif [ "$actionToPerform" = "2" ]; then
# echo "Stopping $domain"
# domain_action "$actionToPerform" "$domain"
#else
# [ "$actionToPerform" = "3" ]
# echo "Restarting $domain"
# domain_action "$actionToPerform" "$domain"
#fi
done
https://redd.it/17tinew
@r_bash
Trying to figure out how to implement a specific operation on bash arrays as efficiently as possible
So, say I have an array `A` that looks like the following:
A=(a$'\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
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
shopt doesn't set/unset inside an if-block
I have a helper script that I use every day... until today, when it started throwing syntax errors. I haven't changed my bash version nor the script in at least two weeks. I managed to narrow it down to `shopt -s extglob` not setting extglob when inside an if-block. What's even weirder is: none of the lines before that extglob use are launched, but all the lines outside the if-block are launched, so the "syntax error" is happening during runtime instead of at the start like I'd expect.
* why does `shopt -s` inside an if-block not set a shell option?
* why the "syntax error" after already executing some of the lines of the script?
* (probably unanswerable) why did this fail today when I haven't changed bash nor the script in weeks?
EDIT: I can't do code blocks in the starting textpost; can't use \`\`\`, \`\`\`bash nor four-spaces, I'll have to post it as a comment below.
https://redd.it/17yp7xn
@r_bash
Help! I am horrible at this.
I am not great at bash (or any of the others), to the point where I’m not sure what the proper names for things are. If anyone can help I would very much appreciate it!
I am trying to convert a column of a csv (list of protein names) to a list to grep matching lines from a bunch of other csvs. What I want are the names of the proteins in column A to become a string list like: Protein A\|Protein B\|Protein C\|Protein D\|
I have the script to run the grep function, all I need to know is if there is a way to get the 300 protein names into the above format. Thank you for any help!!!
https://redd.it/17y5q8r
@r_bash
HELP! Bash script wilding. Even GPT is stumped.
Hi there,
I've been modifying this script so that it uses grim and slurp to work on wayland. Now I've hit the road block. The output of the program (After modification) is:
Selected geometry: 1118,285 528x656
Screenshot command: grim -g "1118,285 528x656" /home/baighack3rss/Pictures/Screenshots\/1700230454.png
invalid geometry
Command exit status: 1
Now here is the interesting part. If I just copy the screenshot command and run it in the terminal it works but in the script it's an invalid geometry.
I've attached the script to this hastebin.
Thanks in advance!!
https://redd.it/17xg4m2
@r_bash
Many of my functions are not recognised by GitHub as functions
I'm wondering if there's something wrong with the way I format my functions in bash. They work just fine in bash. But GitHub doesn't recognise many of them as functions.
GitHub's Symbols panel only lists 7 of the script's 21 functions. https://i.imgur.com/njBUl8J.png
Notepad++ shows all 21 functions in it's Function List. https://i.imgur.com/OxUxXWw.png
I had a similar issue with Notepad++ when the first line in the function was a comment. I fixed that by adding a space after the {
The bash script is here: https://github.com/007revad/Synology\_HDD\_db/blob/develop/syno\_hdd\_db.sh
Is there anything I can change in my bash script that will make GitHub recognise all of my functions as functions?
​
https://redd.it/17x7fp8
@r_bash
Does anyone have a clue how to do this
Script 4: The server that hosts the images that you process with your previous shell script has been having connectivity problems. You want to write a shell script named checkserver.sh that you can schedule to run at night to ping the server and capture the results in a file. ping is a command to send packets to another computer to verify you can connect to it. Your script should take the IP address of the server as a parameter. For testing purposes, you may use 173.255.195.185. Your script should ping the server 10 times, save the output in a file and quit. The output file should include the date and time the ping was executed.
https://redd.it/17wxyau
@r_bash
Using an INT trap to dynamically debug a running script
I came up with a way to using `trap ... INT` to help dynamically debug a script/function as it is running. I find it quite useful, and figured others on /r/bash might as well.
Set the following trap at the start of the functions/scripts you want this functionality enabled on:
trap 'printf '"'"'%s\n'"'"' "" "press [a] to Abort (exit)" "press [u] to Unset INT trap (makes <ctrl> + <c> work normally again)" "press [x] to eXecute a command" "press [p] to print the Present working directory" "press [i] to print Information about what caller/function/line/command is currently running" "press [d] / [D] to [start] (set -xv) / to [stop] (set +xv) printing Debug output to stderr" "press [v] / [V] to write Vars (declare -p) to [stderr] / to [file (${PWD}/.vars)]" "press [e] / [E] to write Environment (env) to [stderr] / to [file (${PWD}/.env)]" "press anything else to continue" >&2;
read -r -n 1;
case "$REPLY" in
a) exit ;;
u) trap - INT ;;
x) if [[ $USER == root ]] && [[ ${SUDO_USER} ]] && ! [[ ${SUDO_USER} == root ]] && type -a su &>/dev/null; then su -p "${SUDO_USER}" < <(read -r && echo "$REPLY"); elif ! [[ $USER == root ]]; then source <(read -r && echo "$REPLY"); else echo "for security running generic commands as root is not allowed" >&2; fi ;;
p) echo "$PWD" ;;
i) echo; [[ $FUNCNAME ]] && printf '"'"'function: %s\n'"'"' "$FUNCNAME" >&2; printf '"'"'caller : %s\n'"'"' "$0" >&2; [[ $BASH_LINENO ]] && printf '"'"'line : %s\n'"'"' "${BASH_LINENO}" >&2; printf '"'"'command : %s\n'"'"' "${BASH_COMMAND}" >&2 ;;
d) set -xv ;;
D) set +xv ;;
v) declare -p >&2 ;;
V) declare -p >"${PWD}"/.vars ;;
e) env >&2 ;;
E) env >"${PWD}"/.env ;;
esac' INT
This will make it so that when you press `<ctrl>` + `<c>` the following menu appears:
press [a] to Abort (exit)
press [u] to Unset INT trap (makes <ctrl> + <c> work normally again)
press [x] to eXecute a command
press [p] to print the Present working directory
press [i] to print Information about what caller/function/line/command is currently running
press [d] / [D] to [start] (set -xv) / to [stop] (set +xv) printing Debug output to stderr
press [v] / [V] to write Vars (declare -p) to [stderr] / to [file ($PWD}/.vars)]
press [e] / [E] to write Environment (env) to [stderr] / to [file ($PWD}/.env)]
press anything else to continue
The shell will then read 1 character and if it is one of the ones listed above it will run the corresponding action in the `case` statement from the `trap ... INT` definition. I chose these actions feeling that they might be of use when debugging a script, though of course you can modify/add/remove possible actions by redefining the trap.
***
One note regarding the "press [x] to eXecute a command" action:
As it is implemented above, it will not execute commands as root. If allowed to run commands as root, it would allow someone to hit `<ctrl>` + `<c>` on a script run with `sudo` and then execute generic commands (outside the scope of what the script was intended to do) as root. Which is dangerous.
If run as root and you press `x` at the INT trap menu it will try and run your command as the (non-root) `$SUDO_USER` (the user you ran `sudo` from) using `su`. Unfortunately, this runs the command in a subshell, meaning you cannot use it to modify any parameters of the running script, which limits its usefulness.
If anyone knows how to run a command in the current (root) shell as a non-root user let me know and ill incorporate it. If you are OK with the security risks of running generic commands as root from the trap menu you can replace the `case` statement's definition for `x` with
x) source <(read -r && echo "$REPLY") ;;
https://redd.it/17wqep9
@r_bash
Just in case this is useful to anyone else
I recently finished a function to validate the file extension of say, a list file or what have you, if you want to limit the filetype that can be passed to your script, and thought I'd share what I came up with:
#==========================================================================
# Check the validity of a file's file extension
# Invoked with: check_ext "<filepath>" <extension length> "<valid file format>"
# Globals: none
# Arguments: file path, length of file extension, accepted file extension
# Outputs: nothing
# Returns: 0 if extension is valid, 1 otherwise
#
# Notes: extension length should be the character length of the extension
# itself (e.g.: 2 for sh) plus the dot preceding the extension (e.g.:
# 3 for '.sh')
check_ext() {
local filePath="$1"
local extensionLength="$2"
local validFormat="$3"
fileName="${filePath##*/}"
fileExtension="${fileName: -${extensionLength}}"
if [[ "$fileExtension" == "$validFormat" ]]; then
return 0
else
return 1
fi
} # End of function 'check_ext'
I'm sure there's probably a better way to go about this, but this is the best I can come up with at this stage.
https://redd.it/17weust
@r_bash
Trying to set a script that will move files to different directories based off size
I can’t figure out how to set a shell script that when I run it will allow me to move a files above or below a certain size into two different directories and was wondering if anyone knew how.
https://redd.it/17w47wx
@r_bash
Monitor text file and run command on change?
I'm writing a now-playing Spotify script with semi cool formating...
When I ask playerctl for metadata I get a mpris:length (with a number) line, among the others.
I am currently giving that (number) to a Var and checking it every second and then re-running the script on change.
I read about a tool that can watch a file and run a command on change of file. I just can't remember what it was. I was thinking I could put the length into a txt file and watch it.
Is it worth using this other tool (that some great haxor will name) to watch the file?
I'm trying to lower system resource use of course.
https://redd.it/17vu88w
@r_bash
Bash Script YouTube Downloader
mwikyo/download-youtube-videos-through-the-terminal-using-a-bash-script-205b21161339" rel="nofollow">https://medium.com/@mwikyo/download-youtube-videos-through-the-terminal-using-a-bash-script-205b21161339
https://redd.it/17vfvsa
@r_bash
weird behaviors
curl -s https://english-e-reader.net/level/pre-intermediate | grep "/book/.*>" | sed 's/<a.*="//' | sed 's/">//' |sed 's|\^|https://english-e-reader.net|' | xargs -n 1 curl -s | grep -E "\^words: " >> out
I cannot write anything to the out file, but without redirecting to the file, everything went right.
https://redd.it/17v73mz
@r_bash
man tool | cat | grep "string"
Out of curiosity, why doesn't grep work after cat? Isn't the stdout just a "textfile"? Ok, now thinking about this, I actually didn't try to run it with root privileges. But would it matter though?
https://redd.it/17tntom
@r_bash
PS1
I have recently started to use oh my bash and now I want to change the color of my PS1 (custome prompt) how should I do it.
I do not seem to have anything regarding PS1 in my .bashrc .
Please help
https://redd.it/17sqrm5
@r_bash
