Recent questions tagged Bash

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bash - Save stdout, stderr and stdout+stderr synchronously

For testing purposes, I would like to save stdout and stderr separately for inspection by subsequent code. For example ... all of these 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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bash - Extract pattern from a string

In bash script, what is the easy way to extract a text pattern from a string? For example, I want to extract ... in the end of the string? See Question&Answers more detail:os...

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

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bash /usr/bin/ng: No such file or directory in Angular

When I run my Angular project by ng serve, it gives this error: bash: /usr/bin/ng: No such file or ... have run npm install -g @angular/cli See Question&Answers more detail:os...

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

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bash - Delete everyting preceding and including a certain substring from variable

In Bash, how can I delete characters from a variable until a certain substring? Example: ananas1kiwi2apple1banana2tree shall ... this case is 2. See Question&Answers more detail:os...

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

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bash - How can I read words (instead of lines) from a file?

I've read this question about how to read n characters from a text file using bash. I would like to know ... show me an easy example? Thanks! See Question&Answers more detail:os...

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

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bash - How to propagate a signal through a collection of scripts?

I have an collection of scripts which are controlled by a main one. I want to trap the signal ctrl+c in the ... Any clues how to realize 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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bash - Awk consider double quoted string as one token and ignore space in between

Data file - data.txt: ABC "I am ABC" 35 DESC DEF "I am not ABC" 42 DESC cat data.txt | awk '{print ... and think that it is one single token? See Question&Answers more detail:os...

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

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bash - Execute multiple shell scripts concurrently

I want to do the following things: Execute multiple shell scripts (here 2 scripts) concurrently. Wait until both ... /bash sleep 5 echo 2 See Question&Answers more detail:os...

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

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bash - how to open a gnome terminal to execute a command with gnome-terminal, constantly?

I have a sh file which includes those lines: gnome-terminal --tab --title="ElasticSearch" --working-directory= ... alive? 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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bash - Why does `if $(true) ; then ... fi` succeed?

Inspired by this question: What should an if statement do when the condition is a command substitution where the command ... else echo no ; fi See Question&Answers more detail:os...

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

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bash - How to grep the last occurrence of a line pattern

I have a file with contents x a x b x c I want to grep the last occurrence, x c when I try sed -n "/ ... lists all the lines, beginning x to c. See Question&Answers more detail:os...

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

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bash - How can I scp a file with a colon in the file name?

I'm trying to copy a file using scp in bash with a colon (:) character in the source filename. The ... 's possible to escape the colon. See Question&Answers more detail:os...

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

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bash - Gradle does not recognize the JAVA_HOME I have set

I have set my JAVA_HOME to /usr/lib/jvm/java-7-oracle, which contains a valid JVM, but gradle insists on using ... "/usr/lib/jvm/java-7-oracle" See Question&Answers more detail:os...

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

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bash - how to redirect output of multiple commands to one file

i have a bash script, that has the following two commands: ssh host tail -f /some/file | awk ..... ... commands be directed into the same file. See Question&Answers more detail:os...

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

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bash - Add a big buffer to a pipe between two commands

Given a bash command line of the form commandA | commandB I want to add a buffer of size ~1MB that sits ... So everything runs sequentially :-( See Question&Answers more detail:os...

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

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bash - Replace all IP addresses in a file to a specified string

I have a huge list of IP address in a file and I want to replace all the IP address to a specified ... IP address with a specific string? See Question&Answers more detail:os...

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

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bash - Run expect command inside while loop in shell script

I have list of filenames in a text file,need to transfer each file into server using scp command.I am ... .Please suggest me any solution. See Question&Answers more detail:os...

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

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bash - Trailing new line after piping to a command: is there any standard?

Answering How to remove the last CR char with cut I found out that some programs do add a trailing new line to ... 2 paste (GNU coreutils) 8.21 See Question&Answers more detail:os...

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

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958 views

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bash - `uniq` without sorting an immense text file?

I have a stupidly large text file (i.e. 40 gigabytes as of today) that I would like to filter for unique lines ... trying to figure it out. :-P See Question&Answers more detail:os...

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

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bash - How to decrease TCP connect() system call timeout?

In command below I enable file /dev/tcp/10.10.10.1/80 both for reading and writing and associate it with ... way to decrease this timeout value? See Question&Answers more detail:os...

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

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bash - bg / fg inside a command line loop

ctrl-z (^z) acts in ways I do not understand when done inside a loop executed from a terminal. Say I type ... using & and call it dark magic? See Question&Answers more detail:os...

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

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bash - /dev/stdin with herestring

I would like a Bash script that can take input from a file or stdin, much like grep, for example $ cat hw ... /stdin: No such file or directory See Question&Answers more detail:os...

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

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bash - Delete n1 previous lines and n2 lines following with respect to a line containing a pattern

sed -e '/XXXX/,+4d' fv.out I have to find a particular pattern in a file and delete 5 lines ... a line containing the pattern simultaneously? See Question&Answers more detail:os...

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

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bash - Color escape codes in pretty printed columns

I have a tab-delimited text file which I send to column to "pretty print" a table. Original file: 1<TAB> ... that in a pretty print scheme. 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 compare hexadecimal numbers with hexadecimal numbers in shell?

How to compare hexadecimal number with hexadecimal numbers in shell? See Question&Answers more detail:os...

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

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979 views

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bash - Output for loop to a file

I am trying to have a for loop output a text to a file 10 times. Here is what I have: for ((i=1;i ... prints Hello World to the screen 10 times. 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 answer

bash - Stop git from writing non-errors to stderr

I have a script that I am using to automatically sync various remote git repositories. One thing I am ... while preserving genuine errors. 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 do I use the linux flock command to prevent another root process from deleting a file?

I would like to prevent one of my root processes from deleting a certain file. So I came across the flock ... from deleting a file in linux? See Question&Answers more detail:os...

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

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