Category Archives: Bash

List open or listening ports

Posted on March 29, 2019 by ronaldpringadi

You started a service, you can’t tell whether it actually bound to its port, and you want to see what’s listening — or you want to find out which process is squatting on port 8080. Two one-liners, two operating systems: … Continue reading →

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Bash string comparison

Posted on September 6, 2016 by ronaldpringadi

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465#!/bin/bash function test(){ echo "" echo "TEST $1" echo "VAR_1: $VAR_1 VAR_2: $VAR_2 " if [ "$VAR_1" = "false" ]; then echo " VAR_1 is false"; fi if [ "$VAR_2" = "false" ]; then echo " VAR_2 is false"; fi … Continue reading →

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Crontab header

Posted on February 1, 2016 by ronaldpringadi

123456# minute (0-59), # |      hour (0-23), # |      |       day of the month (1-31), # |      |       |       month of the year (1-12), # … Continue reading →

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Using grep as highlighter

Posted on December 18, 2015 by ronaldpringadi

1$ grep –color -E ‘^|pattern1|pattern2’ file name

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Simple unit test is bash file

Posted on October 28, 2015 by ronaldpringadi

Consider the following 3 files: 1. shellTestFramework.sh 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647#!/bin/bash # Copyright (c) Ronald Pringadi # Before each Test function setUpTest(){     #"Please overwrite this function on your unit test. Something that need to be done before each test"     … Continue reading →

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Linux find files and total their size

Posted on July 22, 2015 by ronaldpringadi

1find ./ -type f -newerct "1 May 2015" ! -newerct "1 Jul 2015" -print0 | du –files0-from=- -hc| tail -n1

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Search and replace withing a file

Posted on April 14, 2014 by ronaldpringadi

1234567sed -i -e"s/SEARCH_TEXT/REPPLACE_TEXT/g" FILENAME.txt # another example using bakup sed -i.bak -e"s/SEARCH_TEXT/REPPLACE_TEXT/g" FILENAME.txt # another example using variable sed -i -e"s/\/pathname/\/pathname-$date/g" "filename-"$date".xml"

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Bash Scripting Basics (Variable Assignment, If, Loop)

Posted on March 20, 2014 by ronaldpringadi

12345678910111213141516171819202122232425262728293031#!/bin/bash ################################################## # Benchmark the processing time when wkhtmltopdf # converts an html file to a pdf file ################################################## if [[ $1 = "" || $2 = "" || $3 = "" ]]; then         echo "Usage: … Continue reading →

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Compress and Extract Files in Linux

Posted on March 10, 2014 by ronaldpringadi

Extract: .tar.bz2 To extract a tar (Tape ARchiver) file, type the following in the shell prompt: 1tar xvjf yourFileName.tar.bz2 Which will untar it to the current directory. Depending on the file structure that being compressed, it might create sub-directories. Parameters: … Continue reading →

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Delete files older than X number of days in Linux

Posted on November 17, 2013 by ronaldpringadi

Say you backup your database daily and you need to delete the old backup files. You can issue the command bellow which will erase any files within the specified directory that are older than 7 days. 1$ find /your/target/directory* -mtime … Continue reading →

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