Questions tagged [bash-scripting]
Bash scripting is making scripts in the Bash shell language.
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what is wrong with the spaces in this string?
i have following string (a version number): 2.2.0 (15).
but the problem is, I can't trim the whitespaces. are there some curious whitespaces in bash?
because if I do this:
local test=" ${var} ...
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1
answer
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List/Print oldest and newest file in each directory
Could use a bit of help guys.
I need to produce a report for the oldest and newest files that are residing in each unix directory
The structure is simple
Main folder with multiple subfolders that ...
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Bash check array membership with regex
I have just started bash scripting as of this morning, so forgive me for my less-than-adequate skills.
I have a GitHub action where I scp files which have changed on a push event to the production ...
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1
answer
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Move files to new folderif string matches
I'm trying to go through a number of folders and check their contents.
If one or more of the files inside matches any of the strings in a given list, I would like to move those files to a new folder. ...
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Extract all emails from a text document
I have a document that contains text and HTML tags, and there is are a lot of tags like <label>[email protected]</label> How do I extract all the emails from this document using Linux commands....
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Variables inside commands inside if statement
I do not understand why this does not work:
existing_user=$(ldapsearch -x -b "cn=group,ou=group2,dc=company,dc=com" -H ldap://127.0.0.1 -D "cn=admin,dc=company,dc=com" -w "...
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1
answer
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Modify user in openLdap via bash script
Can you please help me put this command into if statement (bash scripting):
$ ldapmodify -D -h
password: [enter password]
dn: cn=vipb,ou=groups,dc=example,dc=com
changetype: modify
add: memberUid
...
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1
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passing bash variables to expect script or scripting expect from inside bash
This script is intended to mount the contents of my server at home as a read/writeable drive in mac os. Unfortunately due to the fact that my house has a dynamic public ip address, the ip address of ...
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2
answers
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Creating multiple symlinks from a string
I have the following script:
#!/bin/bash
test="../t1,../t2,../t3"
ln -sf "{${test}}" .
Above this directory consists of 3 directories:
../
├── script
│ └── test.sh
├── t1
├── ...
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1
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bash search and replace replaces extra character
I am trying to use bash' Parameter Expansion to replace a dollar-sign and am having trouble. I've tried variations but nothing I've tried works, what am I doing wrong? Example:
in_amt="($12.34)&...
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Killall -9 chrome, but not chrome-beta
Both Google Chrome and Google Chrome Beta are named "chrome" in the process list.
I want to kill all instances of chrome, but keep all instances of chrome beta;)
Any pointers as to what ...
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removing old BTRFS snapshots with bash
I'm trying to build my own little backup script, I want to use BTRFS snapshots and keep them for a while. Meanwhile, creating the snapshots is no longer a problem for me, but now I would like to ...
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how to insert a phrase after a word with sed in mac
I have the following code:
sed -i "/#alias/a alias ll='ls -laGh'" /etc/zshrc
sed -i "/#alias/a alias l='ls -l'" /etc/zshrc
in the file /etc/zshrc I have:
#alias
but when ...
- 271
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Bash script treating a multiple arguments like a single argument. Need multiple arguments as multiple arguments
Like "sudo" I would like to create a command that lets me test if the web page can do things like ping, wget, cat, etc. This bash script works OK for single commands like 'www ./test.py' but ...
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1
answer
354
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How to bulk delete zip files without extention in linux
I have a folder full of different files but without extension. How can I delete all files that are zip files?
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1k
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match a string with a whitespace in bash
I have the following string with the following path:
#!/bin/bash
FICHERO_MARCADOR="/Users/javier/Library/Application\ Support/Google/Chrome/Default/Bookmarks"
cp -p $FICHERO_MARCADOR ./...
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756
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Trouble with a bash script running as a systemd service restarting another systemd service the first time
I've written a bash loop and named it freud.sh.
freud.sh
#!/bin/bash
set -x
while :
do
sleep 30
systemctl stop pacemaker
sleep 30
systemctl start pacemaker
done
Here is my unit file:
[Unit]
...
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1
answer
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How to download a portion of a YouTube video
I often come across YouTube videos that I need to crop parts from, but these videos can be long and downloading the entire video just to process a small part of them would take too long and be very ...
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Using `-to` instead of `-t` when using YouTube link as input
This answer shows how to get a portion of a YouTube video by using URLs as input. The command works mostly fine, but I want to avoid using -t as I need to cut between specific timestamps and I'd ...
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Using read to capture multiple variables from a command's output
I have a youtube-dl command that when run outputs two new lines, and I'm trying to capture each of those to variables.
Here is what I have so far, but for some reason I can't understand, it only ...
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if statement - simple bash scripting
I am working on a simple script that checks if there is .vimrc file and what is configured in that file:
if [ "$(ls -a /root | grep .vimrc)" = ".vimrc" ]; then
echo "...
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Bash script special character
I am learning bash scripting, and I found this command in the book:
case `date +%a` in
Can someone explain what does + and a mean? I found that the % sign is there to check our output from the left to ...
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2
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How to check in bash if a function's arguments does not contain any parameters
"Argument" vs. "Paramter"
First of all, let me clarify what I mean by:
if a function's arguments does not contain any parameters
Given the following ls command:
$ ls -a ...
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1
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165
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Cause of lagging process execution
I am running two programs.
One python program which generates a set of large files and writes them to an external hard drive I have mounted to the computer.
The second is a bash script which cleans ...
- 109
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61
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Reject users script help - bash - freeradius
I have this very small script that allows users to access defined hosts, but I do not know how to reject users to access everything else:
This part of the script works fine:
318 Huntgroup-Name ...
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1
answer
884
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Perform single action for every subdirectory
I am using git to manage my repositories. it can perform action only to the current directory/repository.
I have directories structure like the following:
myRepos
|
--repo 1
--repo 2
--repo A
--...
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1
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Starting X Server
I installed Arch with KDE plasma. I want to start KDE without display manager and configured files by instructions from Arch wiki https://wiki.archlinux.org/title/KDE#From_the_console .But after ...
user1395406
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Why does Bash require closing some statements?
Something I've always wondered but never gotten around to asking. In Bash:
if statements require an ending fi
case statements require an ending esac
do statements require an ending done (which ...
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When pressed ctrl+c only break out of current function and not whole bash script
I'm trying to write a script wherein if someone pressed CTRL+C (Keyboard interruption) then it shouldn't exit the entire script, just the current execution function.
Can anyone suggest what logic can ...
- 65
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4
answers
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How to rewrite a wall of if-elif statements
For cigs.sh - the complete script can be found here - I wrote the following ugly (but perfectly working) logic to print and format the script's output, partly just to figure out all the edge cases but ...
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564
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How to display weeks, days and hours in script
This is a follow-up question to a previous question regarding a bash script I wrote to help me more accurately keep track of my vices. I'm now trying to modify the script to display all non-zero units:...
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1
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How to make getopts parameter optional
I wrote the following bash script as a budgeting tool to more accurately calculate (and moderate) when I last bought a pack of cigarettes.
In addition to -h for printing the output, it takes one other ...
- 12.8k
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1
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Matching variables in bash
Trying to ping IP and return result with the HOSTNAME.
first ip is responsive second is not, but the script prints all HOSTNAMES
How do I match IP (i) with the HOSTNAME (h)?
Tried:
for i in 10.10.63....
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1
answer
88
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Access positional parameters out of order in a for loop
I have a script which makes use of multiple (i.e. positional) arguments from the command line, and within it a for loop that iterates through these arguments:
for i in "$@"; do
...
done
...
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How to access positional parameters from within a for loop
My shell script contains a for loop. The script makes use of positional arguments via $1, $2, $3, etc. However, trying to access these parameters from the for loop using something like this:
for i in &...
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209
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Copy a jpg file to another folder bash script unix
The code I have written has some errors:
cd OS2/OS22
for f in *.jpg
do
cp -v "$f" OS! "${f%.jpg}"
done
It says: cp: target 'photo' is not a directory.
*Can someone please ...
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1
answer
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What is awk '{ print $2; }' doing exactly?
I would like to know what is this statement doing exactly, especially the awk part.
ps aux | grep 'sidekiq 5' | grep -v grep | awk '{ print $2; }' | xargs kill -${2:-'TERM'}
I know the entire ...
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a very simple Perl script needed
I have the following text file G.txt.
I need a perl command
perl -e ...
that would extract all negative entries ending with Kč, so that first line it will be
-107,60
and last will be -63,00
I have ...
1
vote
1
answer
1k
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Bash: Open new tab in newly opened terminal
I want to open new terminal windows, each with multiple tabs, and while I've managed to open the windows, I'm having trouble with the tabs. What I currently have is:
#!/bin/bash
# Opens new window, ...
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How do I copy file contents to a variable while using sudo?
I have a file that only has root permissions. I need to copy its contents into a variable in my script, but when I do content=$(sudo cat secretfile.txt) it captures the "last login" ...
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1
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Shell Script : Take filename as an argument and on a standard output display the contents of the file with line number prefixed to it
So, I'm new to shell scripting and I'm trying to write a shell script which takes filename(.txt) as an argument and displays the line number prefixed with each line on a standard output.
This is the ...
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1
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VPN Email Alert by IP address (Bash Script)
I have an OpenVPN server, when a user connects to the server they are given an IP from 192.168.1.20-25. I want to get an alert when these IP's reply back as well as when they disconnect.
So far I can ...
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1
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Why does my bash script not cd correctly?
I'm using Windows Subsystem for Linux, and learning the terminal. I want to open applications on my desktop with the terminal, so I decided to make a bash script to cd to the .exe file and run it.
...
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1
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Bash not doing word expansion after command substitution
From GNU's Bash Manual Sections 3.5.7: Word Splitting:
The shell scans the results of parameter expansion, command substitution, and arithmetic expansion that did not occur within double quotes for ...
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0
answers
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Split a file into multiple files based on values from bookkeeper file
I have 2 files, where I need to split File 1 into multiple files of size specified by File 2 contents. Sum of File 2 contents will always be equal to size of file 1. There can be many entries in File ...
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1
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99
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Print the files if exists from different folders with same suffix integer value in shell script
I have two different folders
Folder1 Folder2
cmp_data_0.bin decmp_data_0.bin
cmp_data_1.bin decmp_data_1.bin
cmp_data_89.bin ...
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1
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77
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BASH: List External drives
I am trying to make a script that list all disk on my Mac exluding /dev/disk0 and /dev/disk0 (I only want it to show the external and virtual drives) and the name of the primary partition.
Something ...
0
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1
answer
807
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How do I replace a certain line in /etc/passwd file?
So, I'm trying to make a script that disables the root account by changing the
root:x:0:0:root:/root:/bin/bash
with
root:x:0:0:root:/root:/sbin/nologin.
Is there a command that lets me do this? Thanks....
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Bash script that displays time on terminal
I wanted to write a bash script that serves like a greeting and show date and time(in terminal), and I ran into some issues. I've done some digging I solved most of the issues. The one and only issue ...
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Script runs slow processing stdout piped from service
I am using a utility named oscdump which listens on a specified port for OSC messages and prints the messages to stdout. I wish to parse and process these messages in a script however my script runs ...
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