All Questions
Tagged with bash-script or shell-script
16,738 questions
-4votes
0answers
55views
Creating in Linux files in GB or MB range by various random size by read a file [closed]
In Linux in Bash i have this script (thanks to Ed Morton) . $ cat ./tst.sh #!/usr/bin/env bash while read -r idx sfx size; do echo fallocate "file${idx}.${sfx}" "$size" done &...
- 533
12votes
7answers
2kviews
Idiomatic way of generating a unique filename?
In a script I'm writing, I want to create something temporary on my filesystem, but - it's not in /tmp but elsewhere, and may not be a file nor a directory (e.g. maybe it's a named pipe or a symbolic ...
- 10.5k
-2votes
1answer
111views
Creating in Linux files in GB or MB range by various size by read a file [closed]
In Linux with Bash, there is the File numbers_in_one_line. In this file there is only one line with several numbers, all separated by spaces. These numbers are the value in bytes for creating files ...
- 533
-1votes
2answers
81views
Counting unique IP addresses per hour in existing log files
I am trying to determine the number of unique web visitors to my website each hour. The log files (access*.log) contain many lines looking similar to this. 192.168.211.85 - - [29/Sep/2024:10:17:02 -...
- 307
14votes
1answer
3kviews
Why does cd '' succeed in bash?
Maybe I'm missing it, but I don't find it documented that cd '' should succeed. Since there is no directory with the name '', it seems obvious that it should fail. For example, mydir= cd -- "$...
- 1,089
0votes
0answers
48views
How should one choose whether to utilise ~ or $HOME? [duplicate]
Context When utilising the IEEE Standard 1003.1-2017 Shell Command Language, I frequently want to reference the value which $HOME contains. However, two methods of dynamically acquiring the path are ...
-3votes
1answer
97views
bash -n is a not documented in manpages or info documents [closed]
Even though bash -n is a valid and widely used option, some manpages don't clearly document it in the bash options section, even though it is implemented. It's also not in the GNU Bash Reference ...
- 1,166
0votes
1answer
87views
How to create splittet random files and join them with dmsetup
In Linux in Bash, there is a script, a part of the script is this while true ; do echo awk -v x=$(<"$TEMPDIR"size_container_in_byte) -v n=$(<"$TEMPDIR"parts) 'BEGIN{...
- 533
0votes
1answer
104views
How to compare output of a program with a reference value in a shell script?
I have my own implementation of a Redis server which I'd like to test through a shell script. The general idea is to feed it with some commands through nc, and since nc prints the output of my program ...
- 111
0votes
2answers
97views
How to redirect output from a program that waits for input
Following this post I created my own version of the script, with the difference that user and password are forwarded from the environment variables: #!/bin/zsh pamtester login $user authenticate <&...
- 101
0votes
2answers
87views
how do i use pv in a script that has a seq for loop
I have a script that has a for loop in it that runs a specific amount of times, and I was wondering if it is possible to implement the pv command in my script to add a progress bar. Here is my code: ...
-1votes
1answer
33views
How do you know if a package would be upgraded or downgraded by apt?
If you are about to run command sudo apt-get install --allow-downgrades <pkg>/<target-release> how do you know if the package would be downgraded or upgraded before running the command? I ...
- 716
-7votes
2answers
94views
How can I pick random items from a list, but some more often than others, in a Bash config file? [closed]
In Linux, using Bash, I have two scripts: script.sh is the main script, and script_config.sh is the configuration for script.sh. In script.sh, I do source script_config.sh to load all the config ...
- 533
0votes
2answers
88views
List and count ciphers used by cryptsetup in /dev/mapper devices
In my Linux Computer there are many files called file1, file2, file3 ... in /dev/mapper/. Now I want to have an overview from the files what cipher is used how often. I tried this for i in /dev/...
- 533
0votes
2answers
85views
How to analyse a number of different datasets with a script and save the output for each dataset in a different new directory?
I am interested in analysing 50 different datasets with a script and saving the output of each of the 50 analyses in 50 different corresponding directories. To avoid doing this manually, how could ...
