Recent questions tagged bash

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Both about -a and -e options in Bash documentation is said: -a file True if file exists. -e file ... result when used inside single brackets? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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704 views

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bash - How to define a shell script with variable number of arguments?

I would like to define a simple abbreviation of a call to gs (ghostscript) via a shell script. The first ... or myscript *.pdf outfile.pdf. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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621 views

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bash - How can I make Perl and Python print each line of the program being executed?

I know that bash -x script.sh will execute script printing each line before actual execution. How to make ... Python interpreters do the same? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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723 views

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bash - Best way to choose a random file from a directory in a shell script

What is the best way to choose a random file from a directory in a shell script? Here is my solution in Bash ... GNU installed but not Perl 5. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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bash - shell variable in a grep regex

I'm trying to use a variable in a grep regex. I'll just post an example of the failure and maybe someone can ... it. $ echo $string test this $ See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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662 views

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bash - Prevent grep returning an error when input doesn't match

I want to write in a bash script a piece of code that checks if a program is already running. I have the ... Is there any solution to that? Thx See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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792 views

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bash - Ending tail -f started in a shell script

I have the following. A Java process writing logs to the stdout A shell script starting the Java process Another shell ... ' exit 0 fi done } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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954 views

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bash - CURL escape single quote

How can I make this work? curl -XPOST 'http://localhost:9290/location/place' -d '{"geoloc": {"lat": "38. ... u0027 (the unicode ') I'm stuck See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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763 views

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bash - Fixing a systemd service 203/EXEC failure (no such file or directory)

I'm trying to set up a simple systemd timer to run a bash script every day at midnight. systemctl --user ... full script if that's helpful. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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742 views

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bash - Pipe | Redirection < > Precedence

I want to make clear when does pipe | or redirection < > takes precedence in a command? This is my thought but need ... and a > with a | ??? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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673 views

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bash - What does the --ntasks or -n tasks does in SLURM?

I was using SLURM to use some computing cluster and it had the -ntasks or -n. I have obviously read the ... test it out in the cluster. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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686 views

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bash - SCP doesn't work when echo in .bashrc?

I have two users in Fedora: Wani root (quite obvious!) My contents of .bashrc of user Wani are: # .bashrc ... not get copied to Wani from root? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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858 views

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bash - How do you send the output of ls to mv?

I know you can do it with a find, but is there a way to send the output of ls to mv in the unix command line? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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908 views

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bash - setting tabwidth to 4 in git show / git diff

At work we are several developers and don't have a code style guide, and some developers indent with tabs, and ... instead of bash. Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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598 views

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bash - Remove a character from the end of a variable

Bash auto completion appends a / at the end of a directory name. How I can strip this off from a ... /$date$target.tar.gz $path } backup See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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800 views

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bash - How can I make a progress bar while copying a directory with cp?

I suppose I could compare the number of files in the source directory to the number of files in the target ... the former is not possible). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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732 views

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bash - Finding empty directories

I need to find empty directories for a given list of directories. Some directories have directories inside it. If ... >C1,C2 this is empty See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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659 views

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bash - Listing the content of a tar file or a directory only down to some level

I wonder how to list the content of a tar file only down to some level? I understand tar tvf mytar.tar ... subdirectories, but not go further. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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559 views

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bash - List files by last edited date

I have a directory: /home/user/ How can I list every file in this directory (including those in sub ... that they were last modified? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.9k views

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bash - Curl with multiline of JSON

Consider the curl command below, is it possible to allow newline in JSON (without the minify) and execute ... sure why problem happen recently. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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789 views

1 answer

bash - How to extract the first two characters of a string in shell scripting?

For example, given: USCAGoleta9311734.5021-120.1287855805 I want to extract just: US See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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932 views

1 answer

bash - Use of an exclamation mark in a Git commit message via the command line

How do I enter an exclamation point into a Git commit message from the command line? It is possible to escape the ... commit -am "Nailed it!" See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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758 views

1 answer

bash - How do I delete/remove a shell function?

I have done this: $ z() { echo 'hello world'; } How do I get rid of it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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839 views

1 answer

bash - How to check if a Docker image with a specific tag exist locally?

I'd like to find out if a Docker image with a specific tag exists locally. I'm fine by using a bash ... a4fbaad9f996 11 weeks ago 131.5 MB See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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878 views

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bash - How to see files and file structure on a deployed Heroku app

My client app that is deployed on Heroku allows the user to upload images onto Heroku. I wanted to test out a ... app. What am I doing wrong? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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754 views

1 answer

bash - How to specify a multi-line shell variable?

I have written a query: function print_ui_hosts { local sql = "select ........." print_sql "$ sql" } ... I split a string into multiple lines? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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706 views

1 answer

bash - Custom format for time command

I'd like to use the time command in a bash script to calculate the elapsed time of the script and write ... into something easier to process. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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744 views

1 answer

bash - How to retrieve absolute path given relative

Is there a command to retrieve the absolute path given the relative path? For example I want $line to contain the ... line; do echo $line done See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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