shell Archives - IT Nursery

linux, Programming

IT Nursery

How to preserve line breaks when storing command output to a variable?

I’m using bash shell on Linux. I have this simple script … #!/bin/bash TEMP=`sed -n "https://stackoverflow.com/""Starting deployment of"'/,/'"Failed to start context"'/p' "/usr/java/jboss/standalone/log/server.log" | ...

June 4, 2022
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bash, Programming

IT Nursery

Run a string as a command within a Bash script

I have a Bash script that builds a string to run as a command Script: #! /bin/bash matchdir="/home/joao/robocup/runner_workdir/matches/testmatch/" teamAComm="`pwd`/a.sh" teamBComm="`pwd`/b.sh" include="`pwd`/server_official.conf" serverbin='/usr/local/bin/rcssserver' cd ...

June 4, 2022
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bash, Programming

IT Nursery

How do I delete/remove a shell function?

I have done this: $ z() { echo 'hello world'; } How do I get rid of it? 2 Answers 2

June 3, 2022
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bash, Programming

IT Nursery

Print a file’s last modified date in Bash

I can’t seem to find how to print out the date of a file. I’m so far able to print out all the ...

June 3, 2022
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linux, Programming

IT Nursery

The ‘eval’ command in Bash and its typical uses

After reading the Bash man pages and with respect to this post, I am still having trouble understanding what exactly the eval command ...

June 3, 2022
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bash, Programming

IT Nursery

List files with certain extensions with ls and grep

I just want to get the files from the current dir and only output .mp4 .mp3 .exe files nothing else. So I thought ...

June 3, 2022
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Programming, shell

IT Nursery

How to set child process’ environment variable in Makefile

I would like to change this Makefile: SHELL := /bin/bash PATH := node_modules/.bin:$(PATH) boot: @supervisor \ --harmony \ --watch etc,lib \ --extensions js,json ...

June 3, 2022
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json, Programming

IT Nursery

How to merge 2 JSON objects from 2 files using jq?

I’m using the jq tools (jq-json-processor) in shell script to parse json. I’ve got 2 json files and want to merge them into ...

June 2, 2022
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linux, Programming

IT Nursery

How to use sed to remove the last n lines of a file

I want to remove some n lines from the end of a file. Can this be done using sed? For example, to remove ...

June 2, 2022
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bash, Programming

IT Nursery

How to get the part of a file after the first line that matches a regular expression

I have a file with about 1000 lines. I want the part of my file after the line which matches my grep statement. ...

June 2, 2022
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