All Questions
Tagged with bash shell-script
6,897 questions
-2
votes
0
answers
27
views
Creating in Linux files in GB or MB range by various size by read a file
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 ...
- 531
0
votes
1
answer
37
views
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 -...
- 309
12
votes
1
answer
2k
views
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 -- "$...
- 1,069
-3
votes
1
answer
96
views
bash -n is a not documented in manpages or info documents [closed]
Even though bash -n is a valid and widely used option, some manpages don't clearly document it in the bash options section, even though it is implemented. It's also not in the GNU Bash Reference ...
- 1,166
0
votes
1
answer
83
views
How to create splittet random files and join them with dmsetup
In Linux in Bash, there is a script, a part of the script is this
while true ; do
echo
awk -v x=$(<"$TEMPDIR"size_container_in_byte) -v n=$(<"$TEMPDIR"parts) 'BEGIN{...
- 531
0
votes
1
answer
103
views
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
0
votes
2
answers
97
views
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
-7
votes
2
answers
93
views
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 ...
- 531
-1
votes
2
answers
82
views
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 ...
0
votes
2
answers
79
views
How to "catch" the output of a command? [duplicate]
I'm struggling with the vocabulary here, so I'll ask this way:
On an embedded system (Raspberry Pi) I use, there is a command invoked as follows:
$ pin-control poll 25
This command "polls"...
- 3,727
1
vote
1
answer
66
views
How can a bash script determine how it was started? [duplicate]
I am running various scripts on Debian 12.X currently with the following bash:
GNU bash, version 5.2.15(1)-release (x86_64-pc-linux-gnu)
I have the following methods/options to execute the script.
...
- 6,329
-3
votes
1
answer
50
views
Rename files, remove the first four signs [duplicate]
There are many files in this format:
IMG_20240717_191421.jpg
IMG_20240620_165358_BURST001_COVER.jpg
IMG_20240624_173513_2.jpg
how can they renamed in Linux in Bash to:
20240717_191421.jpg
...
- 531
0
votes
5
answers
128
views
Move/mark files and the associated-part too
There is a folder with many files in it:
112.mkv
123.md5
123.mkv
221.mkv
467.mkv
aa1.mkv
abc.md5
abc.mkv
bbc.mkv
dde.md5
dde.mkv
ggh.mkv
....
xxy.md5
xxy.mkv
xxz.mkv
How can I move .md5 files and the ...
- 531
0
votes
2
answers
24
views
create unique folder on startup with rpi cam
I have a pi cam on a pi zero that needs to run for the whole duration of being on. this pi camera module is being used in stratospheric launch and during our last one we were able to get videos back, ...
- 1
1
vote
2
answers
75
views
Multi level submenu, return to previous level and main menu as options
I am working on a multi-level menu and I want to implement the ability for sub menus and sub-sub menus to return to the previous menu or go directly back to the main menu. Please see below...
[Menu]
1 ...
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