Recent questions tagged Bash

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bash - Using Python to open a shell environment, run a command and exit environment

I'm trying to automate a process using python. If I am just in the terminal the workflow looks like: user:> . / ... ", shell = True) p.kill() See Question&Answers more detail:os...

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

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914 views

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bash - UNIX date: How to convert week number (date +%W) to a date range (Mon-Sun)?

I have list of week numbers extracted from huge log file, they were extracted using syntax: $ date --date="Wed Mar ... " - "Sun Mar 25 2012" See Question&Answers more detail:os...

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

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838 views

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bash - Command substitution with string substitution

Is it possible to do something along the lines of: echo ${$(ls)/foo/bar} I'm pretty sure i saw ... I missing something or is this impossible? See Question&Answers more detail:os...

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

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692 views

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bash - git: stage only new files

When I have: dirty working directory, dirty staging area, and I copied some new files to the project, how do ... ones? git alias adduntracked= See Question&Answers more detail:os...

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

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759 views

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bash - Is it possible to distribute STDIN over parallel processes?

Given the following example input on STDIN: foo bar bar baz === qux bla === def zzz yyy Is it possible to ... parallel, but I do not know how. See Question&Answers more detail:os...

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

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829 views

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bash - Simple find and replace with sed

I'm trying to replace a number that is in a couple different strings in a text file. Basically it would ... these are totally noob questions. See Question&Answers more detail:os...

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

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823 views

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bash - Delete all lines before first occurrence of specific string in file

Basically I have a file like: junk morejunk somestring bats car somestring bats car somestring bats car and I want ... line as the first 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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788 views

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bash - Exactly how do backslashes work within backticks?

From the Bash FAQ: Backslashes () inside backticks are handled in a non-obvious manner: $ echo "`echo \a`" " ... produces a. Final result is 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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938 views

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bash - ffmpeg not working with filenames that have whitespace

I'm using FFMPEG to measure the duration of videos stored in an Amazon S3 Bucket. I've read the FFMPEG ... duration of the video is returned. 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 - print double quotes in shell programming

I want to print double quotes using echo statement in shell programming. Example: echo "$1,$2,$3,$4"; prints ... but its not being printed. 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 - How to replace a value with the output of a command in a text file?

I have a file that contains: <?php return 0; I want to replace in bash, the value 0 by the current ... long as they only use shell tools. See Question&Answers more detail:os...

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

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734 views

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bash - What does "cat > somefilename <<EOF" (particularly, the greater-than and double less-than symbols) do in shell?

Just came across the following command: cat > myspider.py <<EOF But I'm not sure of the use of > and <<. See Question&Answers more detail:os...

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

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827 views

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bash - What's the difference between "here string" and echo + pipe

Wondering what is the right use of here-string (here-document) and pipe. For example, a='a,b,c,d' ... anyone explain this? Thanks in advance See Question&Answers more detail:os...

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

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774 views

1 answer

bash - Redirect output from sed 's/c/d/' myFile to myFile

I am using sed in a script to do a replace and I want to have the replaced file overwrite the file. ... file that input was taken from. See Question&Answers more detail:os...

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

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710 views

1 answer

bash - escaping newlines in sed replacement string

Here are my attempts to replace a b character with a newline using sed while running bash $> echo 'abc' | sed 's ... output I want is a c HELP! See Question&Answers more detail:os...

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

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1.5k views

1 answer

bash - Escaping a dollar sign in Unix inside the cat command

On Ubuntu, I would like to end up with a disk file that reads: foo $(bar) I would like to create this ... , and cannot get it to work. See Question&Answers more detail:os...

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

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664 views

1 answer

bash - Eliminate partially duplicate lines by column and keep the last one

I have a file that looks like this: 2011-03-21 name001 line1 2011-03-21 name002 line2 2011-03-21 name003 ... a solution with bash/awk/sed? See Question&Answers more detail:os...

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

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644 views

1 answer

bash - Can git pre-receive hooks evaluate the incoming commit?

I'm trying to write a server side pre-receive git hook to evaluate commits as they are being pushed. According ... 'not-yet-recieved' commit? 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

1 answer

bash - How can I add a comma at the end of every line except the last line?

I want add a comma at the end of every line of this kind of file except the last line: I have this now: ... ? Is it possible with sed command? See Question&Answers more detail:os...

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

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796 views

1 answer

bash - strip comments from xml file and pretty-print it

I have this huge xml file which contains a lot of comments. Whats the "best way" to strip out all the ... xml from the linux 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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752 views

1 answer

bash - Artisan showing inserting "32m", "34;4m" and similar

I have no idea why but my Git Bash terminal is showing 34m and random numbers in places. Here's a screenshot. Thanks for any help. See Question&Answers more detail:os...

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

0 votes

752 views

1 answer

bash - Listing files in date order with spaces in filenames

I am starting with a file containing a list of hundreds of files (full paths) in a random order. I would like ... be simple, but I'm stumped. See Question&Answers more detail:os...

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

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828 views

1 answer

bash - How do I place stdout on edit line?

This is bash 5. I want the output of a command or pipeline to end up on the edit line. $ perl -E'say "hi ... > █ or perhaps $ hi more lines█ See Question&Answers more detail:os...

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

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818 views

1 answer

bash - Shell parameter expansion on arrays

Say I read some data into a Bash array: $ IFS=" " read -a arr <<< "hello/how are/you iam/fine/ ... and doing it against every single one. See Question&Answers more detail:os...

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

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815 views

1 answer

bash - Do I need to quote command substitutions?

According to the Google Shell Style Guide, I should: Always quote strings containing variables, command substitutions, ... (echo foo bar)" See Question&Answers more detail:os...

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

0 votes

771 views

1 answer

bash - Python command line argument semicolon-loop error

I was trying out python -mtimeitso I put python -mtimeit "n = 0; while n < 10: pass" Then an invalid syntax ... in timeit? Thank you very much! See Question&Answers more detail:os...

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

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684 views

1 answer

bash - Why do backslashes disappear when run through echo?

I have code like this, which processes a CSV file: #!/bin/bash while read line do variable=$(echo $line | ... can I ensure that is not deleted? See Question&Answers more detail:os...

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

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834 views

1 answer

bash - shell float number in expr

I'm trying to get a float number from this : totalmark=$(expr $sum / $subjects ) Is this correct? See Question&Answers more detail:os...

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

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