Recent questions tagged Bash

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bash - How to execute the output of a command within the current shell?

I'm well aware of the source (aka .) utility, which will take the contents from a file and execute them ... exit right away, nothing happens. See Question&Answers more detail:os...

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

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544 views

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bash - How to default to other directory instead of home directory

I am developing on a windows machine. The only place I need for linux command line is Git Bash. The problem is: ... how to create that .sh 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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523 views

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bash - Looping over arrays, printing both index and value

I want to do something like this: foo=( ) foo[0]="bar" foo[35]="baz" for((i=0;i<${#foo[@]};i++)) do ... )' but, can't you do it in another way? 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

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bash - Difference between terms: "option", "argument", and "parameter"?

What are the differences between these terms: "option", "argument", and "parameter"? In man pages these ... seem to be used interchangeably. 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

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bash - How to remove trailing whitespace of all files recursively?

How can you remove all of the trailing whitespace of an entire project? Starting at a root directory, and ... just print everything to stdout. See Question&Answers more detail:os...

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

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599 views

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bash - How can I ssh directly to a particular directory?

I often have to login to one of several servers and go to one of several directories on those machines. Currently I ... or any way to do 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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723 views

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bash - Repeat command automatically in Linux

Is it possible in Linux command line to have a command repeat every n seconds? Say, I have an import ... to have this repeat automatically. See Question&Answers more detail:os...

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

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666 views

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bash - Substitute all characters between two strings by char 'X' using sed

In a Bash script, I am trying to in-file replace the characters between two given strings by 'X'. I have ... But somehow it is not working. See Question&Answers more detail:os...

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

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791 views

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bash - When should wildcards be inside / outside double quotes?

What is the correct way to use a wild card and a variable to delete many files? This is my variable "$dir" ... to be outside the double quotes. 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

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bash - Why does reading and writing to the same file in a pipeline produce unreliable results?

I have a bunch a files that contain many blank lines, and want to remove any repeated blank lines to make ... "direct" method so unreliable? See Question&Answers more detail:os...

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

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562 views

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bash export not working for only one variable

Occasionally when I export in bash it doesn't give an error but it doesn't set the environment variable either. ... I add the underscore in. See Question&Answers more detail:os...

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

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842 views

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bash - How to send a signal SIGINT from script to script?

I want to trap a signal send from Script-A.sh to Script-B.sh so in Script-A.sh i use the command: (Send ... a SIGINT from a script to another? See Question&Answers more detail:os...

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

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488 views

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bash - Counting lines or enumerating line numbers so I can loop over them - why is this an anti-pattern?

I posted the following code and got scolded. Why is this not acceptable? numberOfLines=$(wc -l <"$1") ... to avoid this particular approach? See Question&Answers more detail:os...

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

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1.0k views

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bash - How do you escape a hyphen as character range in a POSIX regex

I have a csv file full of values such as this: 0.00145423,3.03795e-05 I wanted to check that all the lines ... to grep? bash4.3.33, grep2.21 See Question&Answers more detail:os...

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

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814 views

1 answer

bash - Sum duplicate row values with awk

I have a file with the following structure: 1486113768 3656 1486113768 6280 1486113769 530912 1486113769 5629824 ... of second column? See Question&Answers more detail:os...

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

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666 views

1 answer

bash - How to wait on all child (and grandchild etc) process spawned by a script

Context: Users provide me their custom scripts to run. These scripts can be of any sort like scripts to ... hints will be highly 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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587 views

1 answer

bash - echo "-e" doesn't print anything

I'm using GNU bash, version 3.00.15(1)-release (x86_64-redhat-linux-gnu). And this command: echo "-e" doesn' ... get the natural output ("-e"). See Question&Answers more detail:os...

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

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593 views

1 answer

bash - Why doesn't my if statement with backticks work properly?

I am trying to make a Bash script where the user will be able to copy a file, and see if it was successfully ... echo "Copy was not done" 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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666 views

1 answer

bash - Extract version number from a string

I have a string with components and version numbers: data-c(kuh-small1);divider-bin-1.4.4;divider-conf-1.3.3-w ... way to do this? with sed? See Question&Answers more detail:os...

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

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656 views

1 answer

bash - Missing Carriage Return in Docker for Mac Containers

All of a sudden all of my docker/docker-compose exec/run commands are printing logs that are lacking a carriage ... you are voting to close? See Question&Answers more detail:os...

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

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700 views

1 answer

bash - Reading lines from two files in one while loop

I have a file, file1.csv containing: This is some text. I am using while read line to cycle through ... the corresponding line from file2.csv? See Question&Answers more detail:os...

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

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1.1k views

1 answer

bash - Grep and regex - why am I escaping curly braces?

I'm deeply puzzled by the way grep seems to parse a regex: $ echo "@NS500287" | grep '^@NS500[0-9]{3}' ... , but I'm curious about the answer. See Question&Answers more detail:os...

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

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628 views

1 answer

bash - Why doesn't **sort** sort the same on every machine?

Using the same sort command with the same input produces different results on different machines. How do I fix 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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547 views

1 answer

bash - How to check availability of Perl, its version and presence of a required module?

I have written a Perl script, I just want to give it to every one, for that I planned to write a ... suggestion would greatly 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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592 views

1 answer

bash - Difference between launching a script with ./script.sh and . ./script.sh

Please tell me what is the difference in bash shell between launching a script with ./script.sh and . ./script.sh? See Question&Answers more detail:os...

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

0 votes

723 views

1 answer

bash - Run shell script from Java Synchronously

I am trying to execute a Bash Shell script from Java and it runs fine using this piece of code. public ... .sh") completes execution. 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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745 views

1 answer

bash - Failed to connect to repository : Error performing command: git.exe ls-remote -h https://github.com/szabbas/Sample-programs.git HEAD

I am new to programming and trying to work with GIT repository and while configuring with the JENKINS is facing the ... the image with the same. See Question&Answers more detail:os...

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

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667 views

1 answer

bash - Left side of pipe is the subshell?

Edit: My comment below regarding sed 's@^@ @' <(f1) is incorrect While $BASH_SUBSHELL indicates that we are in ... same level as the main 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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