Recent questions tagged Bash

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bash - bash4 read file into associative array

I am able to read file into a regular array with a single statement: local -a ary readarray -t ary < $fileName ... - all on arrays. 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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680 views

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bash - how to redirect stdout of 2nd process back to stdin of 1st process?

I have two processes which I need to connect like this: proc1 -- sends output to proc2 proc2 -- sends ... this big response to the client. See Question&Answers more detail:os...

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

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697 views

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bash - Is there a grep equivalent for find's -print0 and xargs's -0 switches?

I often want to write commands like this (in zsh, if it's relevant): find <somebasedirectory> | grep ... -regex, or perhaps Perl? See Question&Answers more detail:os...

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

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636 views

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bash - Replacement for source in sh

I need to set the environment variables, usually we do this by source script.sh But now, I am automating it ... I source this script in sh? See Question&Answers more detail:os...

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

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711 views

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bash - How can I count the occurrences of a string within a file?

Just take this code as an example. Pretending it is an HTML/text file, if I would like to know the total number ... function ;; *) exit ;; esac 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 - Display only the n'th match of grep

onefish onechicken twofish twochicken twocows threechicken What if I want to grep for lines containing "two", but ... the result "twochicken". See Question&Answers more detail:os...

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

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859 views

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bash - How to remove all of the diacritics from a file?

I have a file containing many vowels with diacritics. I need to make these replacements: Replace ā, á, ǎ, and ... way to replace all of these? See Question&Answers more detail:os...

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

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618 views

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bash - Installing Ruby with Homebrew

I installed Ruby with Homebrew: brew install ruby Under "Caveats" it said: NOTE: By default, gem installed ... bash_profile but new to 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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567 views

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bash - Git: Show content of file as it will look like after committing

After reading Git pre-commit hook : changed/added files, the following question arose: Given I have a file ... previous contents of file] foo See Question&Answers more detail:os...

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

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827 views

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bash - Use GNU find to show only the leaf directories

I'm trying to use GNU find to find only the directories that contain no other directories, but may or may not ... long list of "." 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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644 views

1 answer

bash - How to get the difference (only additions) between two files in linux

I have two files A1 and A2 (unsorted). A1 is previous version of A2 and some lines have been added to A2. ... Please suggest a 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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682 views

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bash - Why child process still alive after parent process was killed in Linux?

Someone told me that when you killed a parent process in linux, the child would die. But I doubt it. So ... . Could anyone explain why? thx See Question&Answers more detail:os...

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

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670 views

1 answer

bash - Linux: remove file extensions for multiple files

I have many files with .txt extension. How to remove .txt extension for multiple files in linux? I found that ... this for files in sub-folders. See Question&Answers more detail:os...

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

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705 views

1 answer

bash - reverse the order of characters in a string

In string "12345", out string "54321". Preferably without third party tools and regex. See Question&Answers more detail:os...

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

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721 views

1 answer

bash - Ruby - See if a port is open

I need a quick way to find out if a given port is open with Ruby. I currently am fiddling around with this: ... although I do prefer Ruby 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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1.0k views

1 answer

bash - How do I test (in one line) if command output contains a certain string?

In one line of bash, how do I return an exit status of 0 when the output of /usr/local/bin/monit --version ... exit status of 1 when it does? See Question&Answers more detail:os...

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

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930 views

1 answer

bash - How to wait for an open port with netcat?

I'm trying to do a custom dockerfile with jenkins on it. I would to wait until port 8080 is open instead ... 8080 done echo "Jenkins launched" See Question&Answers more detail:os...

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

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873 views

1 answer

bash - How does one change the language of the command line interface of Git?

I'd like to change the language of git (to English) in my Linux installation without changing the language for other ... settings. How to do it? See Question&Answers more detail:os...

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

0 votes

668 views

1 answer

bash - How do you append to an already existing string?

I want append to a string so that every time I loop over it will add say "test" to the string. Like in PHP ... need to do this in a shell 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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1.1k views

1 answer

bash - apt-get install tzdata noninteractive

When I try to apt-get install -y tzdata the command line option for picking timezone shows up. I am trying to ... it is not working as expected. See Question&Answers more detail:os...

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

0 votes

645 views

1 answer

bash - Ignoring specific errors in a shell script

I have a small snippet of a shell script which has the potential to throw many errors. I have the script ... this? Bash Version 3.00.16 See Question&Answers more detail:os...

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

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1.2k views

1 answer

bash - How to decode URL-encoded string in shell?

I have a file with a list of user-agents which are encoded. E.g.: Mozilla%2F5. ... > y.log 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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606 views

1 answer

bash - How to create a frequency list of every word in a file?

I have a file like this: This is a file with many words. Some of the words appear more than once. ... a file, along with frequency information? See Question&Answers more detail:os...

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

0 votes

609 views

1 answer

bash - Search for executable files using find command

What type of parameter/flag can I use with the Unix find command so that I search executables? 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 - How to avoid echo closing FIFO named pipes? - Funny behavior of Unix FIFOs

I want to output some data to a pipe and have the other process do something to the data line by line. ... have them processed as they arrive? See Question&Answers more detail:os...

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

0 votes

893 views

1 answer

bash - For files in directory, only echo filename (no path)

How do I go about echoing only the filename of a file if I iterate a directory with a for loop? for filename in ... . I just want the file name. See Question&Answers more detail:os...

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

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693 views

1 answer

bash - Clean way to launch the web browser from shell script?

In a bash script, I need to launch the user web browser. There seems to be many ways of doing this: $BROWSER ... the web browser to use." fi See Question&Answers more detail:os...

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

0 votes

842 views

1 answer

bash - Switch case with fallthrough?

I am looking for the correct syntax of the switch statement with fallthrough cases in Bash (ideally case-insensitive). In ... $C is 2 OR 3. See Question&Answers more detail:os...

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

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