Recent questions tagged bash

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bash - build argument lists containing whitespace

In bash one can escape arguments that contain whitespace. foo "a string" This also works for arguments to ... the arguments contain whitespace? See Question&Answers more detail:os...

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

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625 views

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bash zcat head causes pipefail?

set -eu VAR=$(zcat file.gz | head -n 12) works fine set -eu -o pipefail VAR=$(zcat file.gz | head ... millions of lines (~ 750 MB, compressed). See Question&Answers more detail:os...

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

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655 views

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bash - How is % special in crontab?

In crontab, can you do something like this? * * * * * echo $( date +%F) >> /path/date.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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bash - Using groovy, how do you pipe multiple shell commands?

Using Groovy and it's java.lang.Process support, how do I pipe multiple shell commands together? Consider this ... out any anything. Thoughts? See Question&Answers more detail:os...

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

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931 views

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bash - for name in `ls` and filenames with spaces

next code doesnt work because of spaces in file names, How to fix? IFS = ' ' for name in `ls ` do number=` ... mv "$name" "./$number" fi 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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565 views

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bash - How do I use a regex in a shell script?

I am trying to match a string with a regex in a shell script. This string is a parameter of the script ( $1 ... guys have an idea ? 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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694 views

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bash - Creating tar file and naming by current date

I'm trying to create a backup script in bash, to tar the contents of a folder and move the resulting file ... Intended output: 2013-08-29.tar See Question&Answers more detail:os...

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

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957 views

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bash - Split CSV files into smaller files but keeping the headers?

I have a huge CSV file, 1m lines. I was wondering if there is a way to split this file into smaller ones ... A one-line command would be great. See Question&Answers more detail:os...

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

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519 views

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bash - What does the curly-brace syntax ${var%.*} mean?

I was reviewing some of my old code and came across this syntax: extractDir="${downloadFileName%.*}-tmp" The ... -brace syntax mean in bash? 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

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bash - How to get bc to handle numbers in scientific (aka exponential) notation?

bc doesn't like numbers expressed in scientific notation (aka exponential notation). $ echo "3.1e1*2" | bc ... format that bc will understand? See Question&Answers more detail:os...

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

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772 views

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bash - How to kill all subprocesses of shell?

I'm writing a bash script, which does several things. In the beginning it starts several monitor scripts, each ... way to handle this situation? 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 - Using conditional statements inside 'expect'

I need to automate logging into a TELNET session using expect, but I need to take care of multiple passwords ... for assistance in the matter! See Question&Answers more detail:os...

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

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491 views

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bash - What does 'K' mean in this regex?

Given the following shell script, would someone be so kind as to explain the grep -Po regex please? #!/bin/bash # Issue the ... s*"K([^"]*)') 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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521 views

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bash - Import XML files to PostgreSQL

I do have a lot of XML files I would like to import in the table xml_data: create table xml_data(result xml); ... file at once into single row. See Question&Answers more detail:os...

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

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556 views

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bash - When does command substitution spawn more subshells than the same commands in isolation?

Yesterday it was suggested to me that using command substitution in bash causes an unnecessary subshell to be ... in isolation would not? 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 - Launch Google Chrome from the command line with specific window coordinates

I'm trying to find a shell command that will open Google Chrome with specific x and y coordinates (so that I ... -chrome http://www.google.com/ See Question&Answers more detail:os...

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

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915 views

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bash - How to remove filename prefix with a Posix shell

How can I remove the filename prefix in Bash as in the following example: XY TD-11212239.pdf to get 11212239.pdf i.e, remove XY TD-? 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 I escape double and single quotes in sed?

From what I can find, when you use single quotes everything inside is considered literal. I want that for my ... chars inside the single 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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576 views

1 answer

bash - How to check if another instance of my shell script is running

GNU bash, version 1.14.7(1) I have a script is called "abc.sh" I have to check this from abc.sh ... running or not from that script only ? See Question&Answers more detail:os...

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

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654 views

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bash - How do you kill all Linux processes that are older than a certain age?

I have a problem with some zombie-like processes on a certain server that need to be killed every now and then. ... longer than an hour or so? 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 do I kill a backgrounded/detached ssh session?

I am using the program synergy together with an ssh tunnel It works, i just have to open an console an type these ... has to be an easier 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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540 views

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bash - LINES and COLUMNS environmental variables lost in a script

Consider the following: me@mine:~$ cat a.sh #!/bin/bash echo "Lines: " $LINES echo "Columns: " ... better than losing the previous screen) 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 - Execute a shell function with timeout

Why would this work timeout 10s echo "foo bar" # foo bar but this wouldn't function echoFooBar { echo "foo bar" ... and how can I make it 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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759 views

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bash - Using cut command to remove multiple columns

given input echo 1,2,3,4,5,6,7,8,9,...100 If I want to cut columns 5 I can do cut -d, -f-4,6- ... columns like 5, 7,etc is there a one liner? 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

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bash - How to format a JSON string as a table using jq?

Just started out with Bash scripting and stumbled upon jq to work with JSON. I need to transform a JSON string ... me in the right direction? 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

1 answer

bash - Run one command after another, even if I suspend the first one (Ctrl-z)

I know in bash I can run one command after another by separating them by semicolons, like $ command1; command2 Or ... term for what Ctrl-z 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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808 views

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bash - pipe stdout and stderr to two different processes in shell script?

I've a pipline doing just command1 | command2 So, stdout of command1 goes to command2 , while stderr of ... is still going to command2 ? See Question&Answers more detail:os...

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

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777 views

1 answer

bash - Multiplication on command line terminal

I'm using a serial terminal to provide input into our lab experiment. I found that using $ echo "5X5 ... to execute a multiplication operation? See Question&Answers more detail:os...

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

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