In Linux, tasks can be automated by writing several commands in one script and then executing the script whenever the same set of commands are needed. These scripts accept a variety of command-line arguments, which are often passed collectively when the script is executed. The good thing is that a built-in function (called getopts) is available […]
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Want to learn about base64 encode and decode method? Here in this tutorial, we explain the base64 encode and decode steps using bash shell scripting with various examples.
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This guide explains what Bash case statement is and how to use case statement in Bash shell scripts, with examples.
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The ‘!’ symbol or operator in Linux can be used as Logical Negation operator as well as to fetch commands from history with tweaks or to run previously run command with modification. All the commands below have been checked explicitly in ba…
Bash supports two types of arrays, namely Indexed Array and Associative Array. This guide explains the Bash associative array in Linux.
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Bash supports two types of arrays namely Indexed Array Associative Array. This guide explains Bash indexed array in detail with examples.
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Loops are useful for automating repetitive tasks in Bash shell scripting. In this guide, we will learn about the for loop with examples.
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In Bash scripting, functions are ways to group the set of instructions together to get a specific outcome. This guide explains how to use functions in bash scripts in Linux with examples.
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When working with Bash scripts, you may end up in a situation where you have to process a series of inputs using the same command. Fortunately, there is a way in Bash to achieve this in a more optimal way using HereDoc. HereDoc, an acronym for Here Document, is an input redirection method to pass multiple […]
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Redirection and piping are two useful features in bash scripting that sysadmins and developers use often. This guide explains what Bash Redirection is and how to work with Redirection in Bash with example commands.
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Using Bash scripts can ensure consistent configuration of SSH and other services. Bash is the default shell on most Linux systems these days. It can be used as an interactive command-line interpreter as well as a scripting language to automate common tasks. This article shows you how to use a Bash script to ensure specific […]
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This shell script will trigger an email when more than 60% of your system memory is used.
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There are many reasons why it’s useful to use bash and the command line. For example, command-line skills help with building repeatable data processes, the command-line makes working with text files easier, it uses fewer resources, can improve productivity and workflow, it’s great for scripting, and command-line skills are useful for cloud services. This is […]
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If you have a long group of commands you need to run press Ctrl-X, followed by Ctrl-E This will open your default editor. When you’re done close the editor (saving the file) and the command will run.
ls -l|awk ‘length($6)==3{x[$6″ “$7]+=$5};END{for(i in x)printf”%s:\t%d\n”,i,x[i]}’
cat list-1 list-2 list-3 | sort | uniq > final.list
Debugg bash scripts by runing with option -x example bash -x scriptname.sh
#! /bin/bash DIR=$1 for a in `ls $DIR` do fname=`echo $a | tr A-Z a-z` mv $DIR/$a $DIR/$fname done; exit 0
# .bash_profile # Get the aliases and functions if [ -f ~/.bashrc ]; then . ~/.bashrc fi # User specific environment and startup programs PATH=$PATH:$HOME/bin:/sbin export JAVA_HOME=/usr/java/jdk1.6.0_05/bin/java export PATH=$PATH:/usr/java/jdk1.6.0_05/bin export HISTIGNORE=”&” export EDITOR=nano export PATH unset USERNAME alias rm=’rm -i’ alias cp=’cp -i’ alias ls=’ls –color’ alias zf=’zf.sh’ echo -e “\033[36m########################## \033[0m” echo -e “\033[36mServer $HOSTNAME \033[0m” echo -e “\033[36mWelcome back $USER \033[0m” echo -e “\033[36musers loggged in: \033[0m” echo -e “\033[36m `users ` \033[0m” echo -e “\033[36m`uptime` \033[0m” echo […]
Here is my typical .bashrc file # .bashrc # Source global definitions if [ -f /etc/bashrc ]; then . /etc/bashrc fi # append commenads to bash_history (when using more then one window) shopt -s histappend PROMPT_COMMAND=’history -a’ # User specific aliases and functions PATH=$PATH:$HOME/bin:/sbin #export JAVA_HOME=/usr/java/jdk1.6.0_05/bin/java export HISTIGNORE=”&” export EDITOR=nano export PATH unset USERNAME #function PWD { #pwd | awk -F\/ ‘{print $(NF-1),$(NF)}’ | sed ‘s/ /\\//’ #} #export PS1=”\[\033[0;32m\]\u@\h \[\033[33m\]\$(pwd 3)\[\033[0m\] \$ “;