Questions tagged [scripting]
A script is a sequence of commands or instructions that are executed by an interpreter program rather than compiled into a standalone executable program.
4,424
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Open GUI linux terminal in non-interactive mode
It would be helpful if I can open a terminal and run commands exactly as if they would be run by a non-interactive bash script, to test whether certain commands work in non-interactive mode without ...
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2
answers
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How and why does using redirection or writing files within an if statement affect exit code?
In zsh
echo 'a string' > test.txt
echo $?
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and
[[ $(echo 'a string') ]]
echo $?
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whereas
[[ $(echo 'a string' > test.txt) ]]
echo $?
1
another example
curl -so 'curl-8.2.1.tar.gz' https://...
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1
answer
29
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Force Patch character differences to a file
Hello,
I have an englishStrings.json file and when I make new edits/ additions to it, I need to copy the new changes to all the other language string.json files.
Before making any changes to ...
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36
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!$ in bash script [duplicate]
Saw the use of !$ on this site, so I made a short bash script "bang_dollar.sh" as below:
#!/bin/bash
echo -e '\n'
touch touche.txt
vi !$
This was a copy verbatim of what someone posted ...
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1
vote
1
answer
22
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Logout other users from KDE/plasma as root
I'd like to be able to automatically log out users from their KDE/plasma sessions by a script running as root. The log-out should happen "gracefully", i. e. applications should get a chance ...
- 111
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votes
3
answers
75
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Does `return 0` equal `true` (in sourced script to shell's environment)?
I am working on a highly portable script that users shall source to their shells, forcing me to use POSIX scripting.
There are many useful functions in the script, one of them is special though, as ...
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answer
34
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startup script remain running in background
I use severals window managers as icewm openbox wmaker and others
For these i have one generic startup
In one line i have (to load in traybar one volume control applet according wich is installed in ...
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2
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37
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Getting only used memory from free command every few seconds
It was explained e.g. here:
Get separate used memory info from free -m command
how to cut the output of free command. But I want to do this every few seconds and log it to a file. So I tried:
free -g -...
1
vote
1
answer
57
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How to extract the URL from cURL response in bash script and use this URL to run another cURL command
We have this sample curl command that retrieves data as output. Aside from that, that output also contains another URL that can be used again to perform curl command to get the next data. Please help ...
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1
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Return the root partition name with lsblk or similar when the partition is encrypted
This is my lsblk output:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
nvme0n1 259:0 0 465.8G 0 disk
├─nvme0n1p1 259:1 0 512M 0 part /efi
├─nvme0n1p2 259:2 0 420G 0 ...
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Fedora linux VNC scripting help
I'm trying to make a bash script for a school project which i am using a Fedora system which requires me to launch VNC viewer(TigerVNC), automate any password entry so that no passwords will have to ...
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-2
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1
answer
63
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"for" loop is not executing on the remote server using SSH
The below "for" loop works locally on the same server.
But when triggered through "ssh" protocol on remote servers, the output is not received.
Please, can anyone suggest how to ...
4
votes
2
answers
80
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How to make the (N) patterns of the zsh eatable by bash?
I am trying to develop a script which runs (and, ideally, does the same :-) ) in zsh and Bash. Problem is, that at a point, the zsh-specific part contains a pattern ending with (N). So: this_pattern*(...
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Bash script via .desktop save to variable external filename with fullpath
ok i try to make the most resumed the points i want to do. Sorry for the repetions i don't know how make this question more objectively
The first i am making a script for launch "mupen64plus"...
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8
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1
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643
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Looking for a more permissive alternative to GNU getopt for wrapper script
I often find myself writing shell functions or shell scripts that are meant to be wrappers around other commands.
It is also frequent that I want such a wrapper to support a few flags/options. The ...
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gtar recursively untar but leave in top directory
I am trying to recursively untar a whole lot of directories that have .tar files in them, but without creating any new subdirectories.
I am successfully able to do one at a time with this command
gtar ...
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1
answer
63
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Is it a good idea to put "export BASH_ENV=~/.bashrc" in my .bashrc?
Let's say my Bash has some extensive ~/.bashrc customization that aids me not only in interactive use, but also in scripting (aliases, functions, variables, etc.). I would like to have this available ...
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-1
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1
answer
31
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Iptables not working properly in ubuntu VM under utm app
I want to setup my ubuntu machine like this so that it only opens youtube.com and pw.live website and block all other outgoing traffic.
What I have done so far is created ip_table script below inside ...
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24
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Avoid cumulative sum by Unix shell script -hdfs file copy
We are copying Hdfs directory (contains files) from 1 location to other however there is only 1 Target directory.
For 1st iteration it gives correct count of file size and counts of files as in 1st ...
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1
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44
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Write a script to obtain the date of the last month [closed]
I would like to obtain the date of the previous month as output and store it in a variable using a bash script.
For example, if today's date is 07/04/2023, I would like the output to be 06/04/2023.
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1
answer
73
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endless loop in until loop for unix script
I am doing a unix script using until loop.The idea of my script is it need to continuously verify the url status whether is up or down.When its up, it will exit the loop. In my script, I will use curl ...
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6
answers
741
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Update crontab rules without overwriting or duplicating
I'm trying to figure out a good solution to the following problem:
crontab contains some default rules (A,B,C)
I have a setup.sh script that should append rules from a file my.cron to crontab (...
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42
views
What program can I use to invert the state of Shift?
I want the Shift key to behave as if it was inverted, when it is not being pressed, it's state should be set to 'pressed' and when it is being held down, then it's state should be 'released'.
This ...
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1
answer
38
views
How to validate if the log started flowing after restart of a service?
I have an use case where in part of validations one step is to verify whether the log file has started flowing after the service restart? How it can be achieved easily?
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6
votes
2
answers
1k
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This 'while' loop countdown with sleep doesn't work
I'm having some issues with a bash script, but I don't know why. The script is meant to convert the input (in minutes) to seconds and then start counting down until it reaches zero, at which point the ...
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1
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104
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How to check for passed options using getopts in a POSIX shell? (Report, count, and discard.)
How to check for passed options using getopts (man page) in a POSIX shell? (Report, count, and discard.)
My idea is this: Many of my scripts take no options (not even -h for help, I am transitioning ...
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42
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Sendmail entry in /etc/aliases that modifies the email header before sending it out?
I'm using Sendmail I want to create an alias in /etc/aliases, that modifies the To: line before sending out the message . I assume I need some sort of script or command that the email is piped into. ...
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34
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How to properly format the command argument for sudo? [duplicate]
I have a command that is similar to this minimal example:
$ sh -c 'echo "1=$1"' _ foo
1=foo
$
When I want to run it through sudo, it stops working:
$ sudo -i -u user -- sh -c 'echo "1=...
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1
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55
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Is there any way to permanently have shell aliases on an imutable system
I'm on blendOS https://blendos.co/ which is an immutable operating system which means I cant just add a file to /bin/ like you would do normally to add a custom command
right now I'm keeping it simple ...
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1
answer
129
views
Automatically resize rofi menu height
I want rofi to automatically resize menu's height to the number of available options. There is an option -lines but with it I could only pass constant number. So for each call I'm forced to execute ...
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21
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Would it be feasible to create a script that can right click the mouse at a very specific location when an even more specific number gets generated?
I'm aware of a program that can simulate a right-click at specific coordinates on my display at any given interval.
However, I'm wondering if it's possible to write a script that can perform a right-...
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0
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185
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How can I run the file currently open in the kate editor as a python script?
I am writing Python scripts and using a shebang line to specify the location of the Python interpreter in my system.:
#!/usr/bin/env python
So, in principle, my system should be able to run the ...
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1
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24
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Copy multiple files by filenames in subdirectories in linux
I can do the following to copy a file from subdirectories.
find . -name "file1.txt" -type f -exec cp {} ./distfolder \;
How do I change this code to copy multiple files (file1.txt, file5.txt,...
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1
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90
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Automate "atlasvpn connect"
I want to connect to a server through AtlasVPN automatically. But I have some difficulties to create a code that works at the startup of my Ubuntu system. Look at how that company's script works and ...
0
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1
answer
149
views
How to escape characters inside variables in awk?
I'm trying to make a script that uses awk to get the recent file names from .config/okularrc and pipe them into dmenu, and back to awk to get the path for the name selected.
However, I'm getting an ...
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1
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51
views
ZFS script pull latest snapshot and restore
I keep my zfs snapshot backups in zfs/snapshotbackps and my virtual machghines run off direct zfs location
I am trying to create a script that will pull the latest snapshot and restore it.
I've tried ...
- 2,903
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2
answers
148
views
Combine rows based on shared elements (bash/awk)
I have a following file:
a3 v2c
v5 a7
a9 v2c
v1c a3 a7c
Desired output (without duplicates in each row):
a3 a7c a9 v1c v2c
a7 v5
What I want is to combine the rows sharing at least one element.
In ...
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votes
2
answers
287
views
isblocks.conf create onclick event (open firefox with URL)
I have this block in /etc/i3blocks.conf
[rss]
command=rsstail -n1 -1 -N -u https://news.ycombinator.com/rss | iconv -f UTF-8 -t ASCII//TRANSLIT | head -c 50
color=#00FF00
interval=300
I'd like to ...
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i3blocks.conf Error could not parse JSON lexical error
I have this error in my /etc/i3blocks.conf
Error: Could not parse JSON (lexical error: invalid bytes in UTF8 string.)
My code in /etc/i3blocks.conf looks like this.
[rss]
command=rsstail -n1 -1 -N -u ...
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82
views
Get coordinates with xdotool upon user click and use them in an automation script
I am trying to prompt the user "Click the confirm button" and use the coordinates as a variable in a script.
If the user clicks at 1285 786, I would like to click this coordinate once and ...
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0
answers
84
views
systemd: controlling timing of execution in *.service file
I've managed to get my script to run on shutdown or restart, however, I get an error, which is I think is caused by the script being run too late. The *.service file is:
[Unit]
Description=My special ...
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votes
3
answers
68
views
Matching variable value and setting default
I have a variable that can take any of the values "SUBSCRIPT", "ITERATE", "COUNTER".
How can I test the variable in any of those, and default to "SUBSCRIPT" in ...
- 1,183
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1
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32
views
How do I write a script that runs "du -sh" for every file in a directory?
My organization has a network share dedicated to user files. Each user has their own directory. I am trying to figure out who is using the most space on the share. My current code looks like this
#!/...
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Im trying to run a shell script but I keep getting If: expression syntax. How to I get rid of it
Good afternoon, I'm trying to run my code for assignment 4 but I keep getting an expression syntax error, can you tell me why?
#!/bin/sh
if [ "$#" -ne 1 ] then
echo "Usage: ...
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67
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How to navigate to a previous line in a bash script
I have a bash script with a lot of if/elif statements.
Is there a way to take the output of a command, and make it execute the associated if/elif statement, rather than the default version of the ...
- 85
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votes
1
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44
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Allow a certain set of domain names corrisponding ip with resolution and whitelisting on the fly
I'm trying to setup a firewall config for a specific machine. The firewall is configured to block all traffic except for a certain set of allowed IPs.
Today I was asked to put on a teamviewer service ...
- 2,714
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2
answers
829
views
How to pass string from bash to python function
I have a python function which takes a parameter as input and I want to automate and call it through bash. But bash is giving error when i pass variable(string) when calling it
a="test"
...
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1
vote
0
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26
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Recommended solutions, libraries or frameworks to build a repeatable copy/mirror tool
I'm looking to satisfy the following use cases
Occasionally automatically copy all data from a removable storage to fixed folder (and in reverse)
Occasionally automatically sync a folder with a ...
0
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0
answers
84
views
Running a local script on remote server over ssh with sudo privileges
I have a script script.sh on local machine which I want to execute on remote server with sudo permissions. I am logging in to remote server through SSH and executing the script using the below command
...
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3
votes
2
answers
690
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Race condition not seen while two scripts write to a same file
I have two scripts running parallelly and they are echoing to the same file. One script is echoing +++++++++++++++ to the file while the other script is echoing =========== to the file.
Below is the ...
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