Recent questions tagged Bash

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bash - What does `kill -0 $pid` in a shell script do?

Basically, what signal does '0' represent, because here I see SIGNAL numbers starting from 1. See Question&Answers more detail:os...

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

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694 views

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bash - How do you search for files containing DOS line endings (CRLF) with grep on Linux?

I want to search for files containing DOS line endings with grep on Linux. Something like this: grep -IUr -- ... | xargs -ifile fromdos 'file' See Question&Answers more detail:os...

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

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724 views

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bash - Copy all files with a certain extension from all subdirectories

Under unix, I want to copy all files with a certain extension (all excel files) from all subdirectories to ... Any solutions for these problems? See Question&Answers more detail:os...

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

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536 views

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bash - Script to get the HTTP status code of a list of urls?

I have a list of URLS that I need to check, to see if they still work or not. I would like to write a ... to a page containing the text "404" See Question&Answers more detail:os...

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

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543 views

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bash - How to determine function name from inside a function

If I have a Bash script like: #!/bin/bash f() { # echo function name, "f" in this case } Is there any ... which is the file name of the script. See Question&Answers more detail:os...

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

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893 views

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bash - Padding characters in printf

I am writing a bash shell script to display if a process is running or not. So far, I got this: printf "%-50s %s " ... -------------- [UP] See Question&Answers more detail:os...

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

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826 views

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bash - What is a unix command for deleting the first N characters of a line?

For example, I might want to: tail -f logfile | grep org.springframework | <command to remove first N characters> I ... this but I'm not sure. See Question&Answers more detail:os...

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

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727 views

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bash - Minimal web server using netcat

I'm trying to set up a minimal web server using netcat (nc). When the browser calls up localhost:1500, for ... though. How can I achieve this? See Question&Answers more detail:os...

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

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798 views

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bash - What is the Linux equivalent to DOS pause?

I have a Bash shell script in which I would like to pause execution until the user presses a key. In DOS, this ... I can use in my script? See Question&Answers more detail:os...

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

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619 views

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bash - Remove all files except some from a directory

When using sudo rm -r, how can I delete all files, with the exception of the following: textfile.txt backup ... script.php database.sql info.txt See Question&Answers more detail:os...

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

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964 views

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bash - How do I pause my shell script for a second before continuing?

I have only found how to wait for user input. However, I only want to pause so that my while true doesn't crash my ... '1'. How can it be 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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bash - ls command: how can I get a recursive full-path listing, one line per file?

How can I get ls to spit out a flat list of recursive one-per-line paths? For example, I just want a ... path fragments, I want full paths. See Question&Answers more detail:os...

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

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552 views

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bash - Can't get expand_aliases to take effect

I can't get expand_aliases to take effect in bash. I've tried a lot of different things, and nothing works. Here' ... 's being done.) Any ideas? See Question&Answers more detail:os...

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

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614 views

1 answer

bash - Specify other flags in awk script header

I want to write an awk script file using the #!/bin/awk -f header, but I want this script to always ... /etc/passwd followed by some awk code See Question&Answers more detail:os...

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

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690 views

1 answer

bash - Running shell command that has nested quotes via ssh

I have this following shell command: ssh user@host "df | grep /dev/ | awk 'BEGIN{print "DISK", "%USAGE", ... %USAGE STATUS /dev/sda1 95% GREEN See Question&Answers more detail:os...

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

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790 views

1 answer

bash - Floating point comparison in shell

Can you please suggest to me the syntax for doing floating point comparison in a Bash script? I would ideally like ... then # some code here fi See Question&Answers more detail:os...

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

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1.7k views

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bash - Iterating through JSON array in Shell script

I have a JSON data as follows in data.json file [ {"original_name":"pdf_convert","changed_name":"pdf_convert_1"}, {" ... . How can I do that? See Question&Answers more detail:os...

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

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652 views

1 answer

bash - Add numbers to the beginning of every line in a file

How can I add numbers to the beginning of every line in a file? E.g.: This is the text from the ... 000000002 the text 000000003 from the file. See Question&Answers more detail:os...

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

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619 views

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bash - How do I echo stars (*) when reading password with `read`?

What do I need to do for code in Bash, if I want to echo *s in place of password characters (or even ... the user types something in using read? See Question&Answers more detail:os...

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

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727 views

1 answer

bash - Openssh Private Key to RSA Private Key

(I am using MAC) My id_rsa starts with -----BEGIN OPENSSH PRIVATE KEY----- but I expect it to starts ... should also transfer this. Thank you! See Question&Answers more detail:os...

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

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589 views

1 answer

bash - Piping and Redirection

What is exact difference between piping and redirection? Where should we use piping and where should we use ... How they internally work? See Question&Answers more detail:os...

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

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663 views

1 answer

bash - Passing arguments by reference

I want to ask if it is possible to pass arguments to a script function by reference: i.e. to do ... new Any thoughts would be appreciated. See Question&Answers more detail:os...

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

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590 views

1 answer

bash - run a shell script and immediately background it, however keep the ability to inspect its output

How can I run a shell script and immediately background it, however keep the ability to inspect its output ... may not have been initialized. See Question&Answers more detail:os...

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

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565 views

1 answer

bash - File content into unix variable with newlines

I have a text file test.txt with the following content: text1 text2 And I want to assign the content of the ... suggest me a solution for this? See Question&Answers more detail:os...

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

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808 views

1 answer

bash - How to increment version number in a shell script?

The following simple version control script is meant to find the last version number of a given file, increment ... and drawing a comparison. See Question&Answers more detail:os...

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

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715 views

1 answer

bash - How do I know when my docker mysql container is up and mysql is ready for taking queries?

I am deploying a few different docker containers, mysql being the first one. I want to run scripts as soon as ... ./my_script.sql 2>&1) 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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639 views

1 answer

bash - Node.js Shell Script And Arguments

I need to execute a bash script in node.js. Basically, the script will create user account on the system. ... js over an ssh connection. thanks See Question&Answers more detail:os...

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

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912 views

1 answer

bash - How to remove (base) from terminal prompt after updating conda

After updating miniconda3, whenever I open a terminal it shows "(base)" in front of my username and host. In ... this (base) taking up space. See Question&Answers more detail:os...

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

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