Bash Script

variable

syntax: <variable-name>=<value> For variables to work you cannot leave a space between the variable name, the ”=” and the value. They cannot have spaces in. After decalring you can use the variable anywhere in the script using a $ followed by the variable name.

#!/bin/bash

name="Jammy"

echo $name

//output: Jammy

Debugging

Bash script can be directly debugged by running using:

bash -x file.sh

also set -x and set +x can also be used to debug bash script

set -x
# This part will be debugged
set +x

Parameters

Parmeters can be read using $1, $2, ...

name=$1

echo $name

If we want to read user input on runtime, read command can do the work

#!/bin/bash

echo "Enter name: "
read name

echo $name

Some of the intersting variables are:

$0 # name of the script executed
$# # Number of arguements passed down to script