Questions tagged [bash-scripting]
Bash scripting is making scripts in the Bash shell language.
885
questions
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Recursively Query Audio Quality
looking for some guidance (aka someone to do it for me) for a script to delve into my "music" folder and then list out all the songs' reported bitrate/depth.
I'm well out of practice but I'm ...
- 75
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0
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8
views
transforming ASCII text to camel_case + .-: should I use tr, sed/awk, or perl to be most POSIX?
I've got a variety of ASCII text, in single lines.
I would like to:
tr '[:upper:]' '[:lower:]' (change to lower-case)
tr -s ' ' (squeeze multiple spaces into one)
keep existing '_' and '.' characters
...
- 11
0
votes
0
answers
12
views
Tabby: very frequent broken pipe error
I am using Tabby on Ubuntu 16.04
I am getting very frequent broken pipe error, and that too for simple commands like
ls
kill -9 5827
What is wrong? and what could be done to fix it
- 566
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29
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User Group Creation @ SSH key script issue
Based on my requirement of dev sever ,I have Created a Linux function that will create dev user, but code I have tried find some issues , My requirement are like this:
1.Take the users's first name ...
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1
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2
answers
45
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Unable to get sudo to work in script when using cron
Environment: RHEL7.9
Access: No root access. I have sudo access to some commands (no password)
Issue: my personal crontab calls a script with sudo, sudo isn't working.
I have a script.sh that calls ...
- 188
1
vote
0
answers
33
views
Unexpected behaviour in bash function
I'm scratching my head why a bash script won't work. I've condensed it to the following:
#! /bin/bash
function syncuser()
{
cat ~nagios/.ssh/authorized_keys
cat /home/$1/.ssh/...
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0
votes
1
answer
61
views
Making a bash script execute ssh
I want a bash script to start multiple SSH connections to multiple linux servers in multiple new bash windows, not for further processing, just to connect with a simple command instead of having to ...
0
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0
answers
16
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Pull dmidecode info over SSH and save info to local file with hostname entry
Scripting is not my strong suite, but I'm trying to learn.
Trying to pull dmidecode info, specifically 'Product' from the dmidecode output, on remote systems from the main server, and save the info ...
- 1
-2
votes
1
answer
36
views
Symlink that runs a script when accessed (Linux)
I would like to make a symbolic link that refers to a file and runs a script every time it is accessed (specifically one that shows a notification and logs to a file). After a quick search of Google ...
0
votes
1
answer
34
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how to call bash function on login as root user
I'm using Arch (with Xfce) and need to run a bash function when I log in to my OS.
The function that I wrote, needs to be run by root access.
This is the function:
my_func() {
sudo -v
sudo chown ...
- 101
0
votes
1
answer
53
views
How can I modify this bash script so that the port argument is optional?
I often connect through ssh to Docker containers running on a remote server. Every time the container is stopped or removed, I need to copy my ssh key on the container again, in order to connect. For ...
- 317
1
vote
1
answer
72
views
In Bash: "source" a (dynamically) created script, without use of a temporary file
Example, for your amusement:
$ f=/etc/os-release; . $f; cat $f | sed -re 's/(.*)=.*/printf "%20s: %s\\n" "\\$\1" "$\1"/'
printf "%20s: %s\n" "\$NAME" &...
- 7,660
1
vote
1
answer
45
views
Echo variable which references another variable in shell script
Statement: "$k"_Id_avg="$(grep -i "$k"_Id_avg file.txt)"
and $k is a loop variable.
Now I want to print the value stored in the above variable, how can I do it?
I have ...
- 11
0
votes
1
answer
32
views
Why !(%) in xargs doesn't work correctly?
I'm attempting to use the following code to omit the last file while copying the rest into a destination folder:
ls -Art | tail -n 1 | xargs -I% cp !(%) ~/test_dst/folder1
The first two pipes get the ...
- 375
0
votes
1
answer
26
views
Finding primers on fasta files with position, line and column information
I've some fasta files which contain exactly 80 columns per line. Forget about the definition line that starts > and consider the rest that has around 1250000 lines. I needed to find some primers ...
- 375
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0
answers
14
views
How to run a kubectl exec of a string expression?
I am trying to generalize a specialized script dumping a kubernetes pod's JVM stats. There are multiple known commands I can run, but they are all predefined. As this is a poweruser script, I want to ...
- 101
0
votes
0
answers
56
views
Automating Build of FFMPEG on Ubuntu 20.04 with NVidia acceleration support
I'm trying to automate deployments of a server with a nvidia gpu for video transcoding and need to build ffmpeg from source with nvcc support.
I've gotten the bash script working up to the point where ...
- 93
0
votes
1
answer
79
views
Executing Remote Script With Remote Console Output
I can ssh to a RPi 4 from Windows 10 and start a remote Python script, but the output of the script appears on the Windows console.
Tried using nohup to be able to close the Windows console without ...
- 13
0
votes
0
answers
25
views
How to update Server configuration file in the IBM WebSphere Application Server (int app svr V 8.5)
Update Server configuration file "server.xml" in the IBM WebSphere Application Server (int app svr V 8.5)
I am able to setup/run Java Spring Boot Web Application (the war file) on the IBMi ...
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1
vote
0
answers
62
views
Unable to run Bash Script in Cronjob on Mac
Below script can execute from normal user but I can't able to run script through cronjob on macos(bigsur): Following error comes when script is executing through job security: ...
- 111
0
votes
2
answers
90
views
Download and then run a file with a script
I am trying to download 2 files and then run them both. I would like to do this in a script but I am not quite sure how to best accomplish that.
right now I am doing it manually in terminal:
wget http:...
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votes
1
answer
42
views
error validating url from youtube in bash
I have a following code:
read -p ":" URL
regex='^(https?\:\/\/)?(www\.youtube\.com)\/.+$'
if [[ "$URL" =~ $regex ]]; then
echo "not valid url "
exit
...
- 101
2
votes
1
answer
371
views
How to detect in Bash when Curl fails downloading non-existent file?
I'm using curl to download a zip file. curl is called from a bash script:
curl --user joedoe http://1.2.3.4/files/joedoe.zip -o /tmp/downloaded.zip
I'd like to detect when the target zip file does ...
- 645
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votes
0
answers
36
views
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=" ${var} ...
- 125
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votes
1
answer
56
views
List/Print oldest and newest file in each directory
Could use a bit of help guys.
I need to produce a report for the oldest and newest files that are residing in each unix directory
The structure is simple
Main folder with multiple subfolders that ...
- 3
0
votes
0
answers
55
views
Bash check array membership with regex
I have just started bash scripting as of this morning, so forgive me for my less-than-adequate skills.
I have a GitHub action where I scp files which have changed on a push event to the production ...
- 103
1
vote
1
answer
23
views
Move files to new folderif string matches
I'm trying to go through a number of folders and check their contents.
If one or more of the files inside matches any of the strings in a given list, I would like to move those files to a new folder. ...
- 11
0
votes
1
answer
50
views
Extract all emails from a text document
I have a document that contains text and HTML tags, and there is are a lot of tags like <label>abc@gmail.com</label> How do I extract all the emails from this document using Linux commands....
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0
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0
answers
30
views
How to impelement a script for automatic router internet switch if one router network down
My requirement show in above image. I want python or shell script for automatic router internet switch if one router internet down. My concept is based on router redundancy.
I am using Ubuntu 14.04 OS ...
0
votes
0
answers
33
views
Variables inside commands inside if statement
I do not understand why this does not work:
existing_user=$(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 "...
0
votes
1
answer
114
views
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
...
1
vote
1
answer
144
views
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 ...
1
vote
2
answers
42
views
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
vote
1
answer
29
views
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)&...
- 21
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votes
1
answer
49
views
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 ...
- 101
0
votes
1
answer
141
views
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 ...
- 44
0
votes
1
answer
96
views
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 ...
- 101
0
votes
0
answers
102
views
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 ...
0
votes
1
answer
55
views
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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1
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29
views
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 $FICHERO_MARCADOR ./...
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votes
1
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40
views
Trouble with a bash script running as a systemd service restarting another systemd service the first time
I've written a bash loop and named it freud.sh.
freud.sh
#!/bin/bash
set -x
while :
do
sleep 30
systemctl stop pacemaker
sleep 30
systemctl start pacemaker
done
Here is my unit file:
[Unit]
...
- 1
2
votes
1
answer
239
views
How to download a portion of a YouTube video
I often come across YouTube videos that I need to crop parts from, but these videos can be long and downloading the entire video just to process a small part of them would take too long and be very ...
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votes
1
answer
44
views
Using `-to` instead of `-t` when using YouTube link as input
This answer shows how to get a portion of a YouTube video by using URLs as input. The command works mostly fine, but I want to avoid using -t as I need to cut between specific timestamps and I'd ...
- 10.3k
0
votes
2
answers
121
views
Using read to capture multiple variables from a command's output
I have a youtube-dl command that when run outputs two new lines, and I'm trying to capture each of those to variables.
Here is what I have so far, but for some reason I can't understand, it only ...
- 10.3k
0
votes
2
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31
views
if statement - simple bash scripting
I am working on a simple script that checks if there is .vimrc file and what is configured in that file:
if [ "$(ls -a /root | grep .vimrc)" = ".vimrc" ]; then
echo "...
0
votes
1
answer
37
views
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 ...
0
votes
2
answers
71
views
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 ...
- 256
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votes
0
answers
60
views
find the main disk of a montpoint
So I need help with this, I want to find every multipathed disk or LUN /main resides on i.e sd[a,b,c,d] then put the results in a file.
sda 8:0 0 893.3G 0 disk
├─sda1 ...
0
votes
1
answer
62
views
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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0
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25
views
In bash, why does the if [ -n ] test return true for an empty string? [duplicate]
This might sound a like a silly question to most people, but it is my first day learning shell scripting, so.
#! /bin/bash
str=""
if [ -n $str ]
then
echo "True"
else
echo ...
- 541