Questions tagged [bash]
Bash is the Bourne Again SHell, the successor to the classic Unix sh (shell).
3,511
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MacOS (Ventura) Daemons failed to run script
Below is my shell scripts (install.sh) to install my apps to /Users/.my-guard folder.
sudo mkdir /Users/.my-guard
sudo launchctl stop com.test.guard
sudo launchctl bootout system /Library/...
- 141
-1
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1
answer
25
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Copy/Move Entire Line To End Of The Line Above
I have a file that looks like the following:
/path/to/a/very/long/path
0 0 0 0 0 0
I need to move the line starting with a number (this can be any value not necessarily 0) to the end of the ...
- 33
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20
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PROMPT_COMMAND duplicating commands on new sessions
Im playing around with PROMPT_COMMAND variable
Was testing out some ways to save all commands into a log file and got some ways using PROMPT_COMMAND + logger + rsyslog
Example export im using
export ...
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1
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31
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Loggin bash_history using UTC timestamp when not using UTC as system time
I am aware that it is possible to add timestamps to bash_history.
The examples I've seen so far it always uses the current system time. And here is the problem for me: On the one hand, I like to keep ...
- 17
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25
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How to automate mybb installation using ssh bash script [migrated]
I have created this bash script to install mybb application automatically on Centos stream 8.
SSH Bash script
#!/bin/bash
# Define variables for MyBB installation
DB_NAME=mybb_db
DB_USER=mybb_user
...
- 169
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0
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21
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Find directories not containing subdirectories with today file date
Can you please help me with a bash string for finding and listing only parent directories NOT containing subdirectories with today file date, so i can delete them recursively?
My Env is CentOS and dir ...
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29
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is there a shortcut for /dev/stdout like "-" is for /dev/stdin?
is there a bash shorcut for /dev/stdout like there is "-" for /dev/stdin ?
One of the use cases is to get bash history without line numbers. There is simply no option for that in the history ...
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1
answer
31
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Command that run fine... but give me an error when "piped" to grep, inside a docker RUN?
Sorry for the title, I really can't explain better. I'm learning shell programming.
I'm trying to detect if Composer has a script named "post-install-cmd". To do that, one can call composer ...
- 339
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2
answers
82
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Get the actual value of free memory is sun sparc
I am trying to get the current (not the average) free memory size of SUN SPARC remote server, but I don't have the permission to use free -m command or prtconf. So, I used command vmstat 2 and the ...
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1
answer
78
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systemd not able to run some bash scripts
(Update with more info May 16, see end of post for journalctl messages)
I've created a systemd timer and service with the purpose of running a handful of bash scripts. In particular I'm aimed at ...
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1
answer
41
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/etc/cron.d not running job [duplicate]
I need to run a script as a user to backup my database every night. I added the following cron job in /etc/cron.d/backup-mysql via ansible.
0 3 * * * backup_mysql /path/backup-mysql.sh
I can see the ...
- 321
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1
answer
31
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How do you compare time date strings not actual dates and times?
I have a bunch of directories with video files that I would like to merge into larger videos. The logic is that the filenames have date time stamps in them that can be used to figure out which should ...
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1
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84
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Cleaning up WordPress thumbnails; trying to find all thumbnails and delete them on Ubuntu 22
So, I'm trying to clean up some backups I have, and they're getting bigger and bigger because of, mainly, the number of thumbnails generated by WordPress per image. I came close to finding a solution, ...
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1
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65
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$'\r': command not found error when executing find in a bash script
I wrote the following script; it's modified for simplicity and privacy reasons:
FILES_ROOT='/data/FILES'
BACK_B2B_RETURNS_S="$FILES_ROOT"'/wms-m-company/w2z/b2breturns/backup'
...
- 115
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Exim.conf Redirect email to an another folder
I am trying to redirect/route incoming emails to another folder depending if they are listed inside the /etc/email_list file (ON/OFF). I am unsure how would I approach this, I am clearly messing ...
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1
answer
22
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Linux, do I need if, else, or statements to accomplish automation of compiling programs from source [closed]
I am wondering what would be the best way to write a bash script to install packages from source, would it even be needed to go in depth with how to automate the task?
For example let's say I want to ...
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25
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Automatize using bash downloading deb files and dependencies and later extracting them to a unique folder and compress it to use in a live filesystem
I am developing a Live filesystem and need to be able to download deb files with its dependencies which I manually do using:
apt download $(apt-cache depends --recurse --no-recommends --no-suggests \
-...
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1
answer
53
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What does lower case "g" mean in top output?
Can someone please help explain this, I have always used to interprete the "g" in top output to be size in Gigabytes even though the convention is to use uppercase "G" but now I am ...
- 103
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1
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57
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Incremental backup of an entire FTP server with Linux [closed]
I'm looking for a simple way to schedule full + incremental backup of a remote FTP server (that also supports SFTP, but without SSH access) from My NAS that is based on Linux, WITH full SSH access. I'...
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1
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39
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Is posible to write script that checks for differences between two patterns in configuration files
Linux. I have for example two config files.
First:
criticalexceptions => [
'yum-updatesd-helper: error',
'cups: cupsd shutdown succeeded',
'hda: drive_cmd: error',
'end_request: ...
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2
votes
1
answer
199
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How to load modules on Synology NAS on boot?
I have a Synology NAS (DSM 6.2.4) and I would like to load usbserial.ko and cp210x.ko on boot.
When I run:
sudo insmod /lib/modules/usbserial.ko
sudo insmod /lib/modules/cp210x.ko
The drivers work ...
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2
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1
answer
125
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Is sudo -u username command the same as doing sudo -i -u username then command?
Is a terminal prompt sudo -u username command
same as doing
sudo -i -u username then command in the next line?
If no, what is the differences? What are the use cases when doing the first is better or ...
- 21
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1
answer
71
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Why can't ssh run rbenv in the shell?
I'm trying to run a bash script on a remote server to install ruby via rbenv.
#!/bin/bash
# ssh deploy@192.168.50.2 'bash -s' < configure.sh
echo "ruby 3.2.1"
rbenv install 3.2.1 --...
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1
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1
answer
118
views
Redirecting stdout and stderr doesn't work with cron
I have the following cron task. Expected behavior is that every output (standard output and standard error output) of this task will be redirected to /dev/null. Unfortunately this doesn't work. Emails ...
- 239
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1
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321
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openssl functions randomly returns warning: command substitution: ignored null byte in input
I try to encrypt some loads, here is a minimum working example (is RSA private key)
to_be_signed="2f93992bb1db9cab0b3b8fc2de0a2863"
#to_be_signed="7d6d2a584a227574e1c113aab56ea490&...
- 2,263
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0
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40
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running "ssh $hostname -o ConnectTimeout=..." again and again in close time seems to disable ConnectTimeout option
I am improving a script made by third parts.
The script runs on a Ubuntu OS.
This scripts contains a loop in which about there are about 10 if statements (they involve only localhost), and each one ...
- 103
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1
answer
682
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Change Alpine Linux default shell
Alpine defaults to ash as the login shell, I want to change it to bash.
What I did so far:
installed bash by sudo apk add bash
installed shadow by sudo apk add shadow
I changed my user's login shell ...
- 405
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votes
1
answer
30
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searching for multiple files, but if one file is missing I want to know from the output + find
$ find ./ -name "AABE*" ## this returns nothing
$ echo $?
0
$ find ./ -name "AWGT*" ## this returns locations of were files matching the criteria
./Atempt3A/AWGT-modified.txt
....
- 101
0
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2
answers
39
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Bash sed command with sed itself as replacement, quotes not outputted
I need to modify the content of a file, with the following sed command (which works fine):
sed -i 's@date.timezone.*@'"date.timezone = $TZ"'@' $PHP_INI_DIR/conf.d/symfony.ini
This line ...
- 339
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31
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How do I configure users on my ubuntu system without shell and execute only one command?
I need to build a Ubuntu server where users will be logged in but I dont want them to give a shell access. As soon as the user logs in one custom command will be executed and it will be allow certain ...
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1
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171
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ansible print folder path from register variable
I'm trying to print just the path of a register var that has multiple values, however I can only print a specific value. how can I print multiple values?
---
- name: find directories
find:
...
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67
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Odd behavior of bash array
I've recently encountered a strange script behavior and still don't understand y the array behaves this way.
Here is a piece of the script:
for nCDATAReg in $(seq 1 4)
do
sTestBuffer1=$(...
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0
answers
19
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forwarding agent via Apache http
In my web application (Apache httpd) at Centos 7, I'm making an SSH connection with forward agent
example:
ssh -A $user@$proxyIP $user@DestinationIP ls -l
if I want it to run in the terminal of ...
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0
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222
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how to make a shell execute with suid
I'm trying to suid a shell and it's not working. I need help understanding why, and how to fix it...
I'm following these steps (as root)
cp /usr/bin/bash /usr/bin/bash-emergency
chmod 4755 /usr/bin/...
- 418
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3
answers
373
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Check if IP Belongs to a CIDR
We have a list of CIDR's
1.10.10.0/24
5.154.0.0/16
5.181.219.0/24
23.90.68.0/24
31.40.214.0/24
I want to check if a IP for example : 23.90.68.56 belongs to any of the above CIDR's. If yes then we get ...
- 125
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0
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9
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Is there a way to script addons for Java Dev Eclipse on Linux (specifically C++ pluggins)?
I am trying to write a deployment script via USB for computer science linux labs in academia. To deploy we are having an admin user run the script locally on each machine, each user that needs to ...
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1
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71
views
How can I verify if time is set correctly on server in my bash script?
I'm working on ultimate backup script for very important server. My script already:
creates a backup
verifies copied file(-s)
verifies gz archive
compares MD5 on local and remote after sending file ...
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312
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How to use gpg without --keyserver (which is deprecated too, just like apt-key)
The background
For some time now, apt-key warn users with deprecated messages like this one:
use of apt-key is deprecated, except for the use of apt-key del in maintainer scripts to remove existing ...
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1
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239
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bash heredoc and code block
Script has to log everyting in it to output and to log file
Like this it works OK:
#!/usr/bin/env bash
some_command_1
((
echo "Some text (in parenthness too)"
echo "Another text ...
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57
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Bash Shell Script Executing 3 Times in /etc/profile.d within Nanoseconds apart
g'day all.. in a spot of bother and a starter of ten for someone. I have placed a simple bash shell script into the root of "/etc/profile.d" and without fail, the script executes 3 times ...
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1
answer
216
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Bash loop through dates
I'm trying to copy data from psql via a bash script now I'm stuck with a loop my bash script is as following:
#!/bin/bash
DATEBEGIN=2016-03-01
DATEEND=2016-03-31
DATEMONTH=2016-03
echo "Copy ...
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votes
2
answers
113
views
Unable to delete file in Centos
I can't remove certain file in Linux. Here the example:
[root@HBL01 home]# ls -ltira index.php
393591 -r--r--r-- 1 apache apache 14335 Nov 23 2021 index.php
[root@HBL01 home]# rm -rf index.php
...
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284
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i want to restrict all commands for user except ssh command
I am a root user and don't want that users can execute all linux command except ssh. They only have to use ssh command in their user. How to do that? please anyone help.
1
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1
answer
104
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why "grep -v" or "tail -f" stop my program's output?
I have a server for Euro Truck Simulator 2 which is called by the following command:
LD_LIBRARY_PATH='$ORIGIN/../../linux64' eurotrucks2_server
When the server is running, sometimes I get these lines ...
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1
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320
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Dump a Table from MySQL Database directly from sql server using bash
How can I dump a table from a MySQL database using a bash script?
Like we can use the below command to dump a table
mysql -u username -p database_name > file.sql
But how can I dump only a single ...
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1
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63
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Fswatch observing folder for new files error from the example doc
I am trying to "listen in" on changes in a particular folder, then once a file comes in, I want to copy the file to another folder. I figured fswatch would be a great choice for this.
And as ...
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1
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71
views
is my crontab syntax invalid?
simple question:
10 4 * * * rm -rf ~/code/rehlds/build/ && ~/code/rehlds/build.sh --compiler=gcc --jobs=4 > /dev/null 2>&1
I checked an there is no /build folder which indicates ...
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0
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1
answer
990
views
Bash script buildscript error. Line 20: syntax error near unexpected token 'fi'
In my bash script I'm getting an error:
./buildscriptbuild.sh: line 20: syntax error near unexpected token 'fi'
I have tested the below bash script in my local system.
Can anyone help me in this ...
- 1
0
votes
0
answers
47
views
GAWK not running in crontab
I have the below script running successfully manually. But when it is executed in crontab (below), I dont see anything happening.
Script
#!/usr/bin/gawk -f
#!/bin/bash
PATH=/usr/local/bin:/usr/bin
#...
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0
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7
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Narrow Down Ubuntu Lock And Active User?
I have been trying to create a bash Script to Locked and Active ,locked User.Can anyone please guide me to narrow down locked and Active User list.tnx
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