Nested if-else-fi in Linux Shell Script
By: Dorris
You can write the entire if-else construct within either the body of the if statement of the body of an else statement. This is called the nesting of ifs.
$ vi nestedif.sh
osch=0
echo "1. Unix (Sun Os)"
echo "2. Linux (Red Hat)"
echo -n "Select your os choice [1 or 2]? "
read osch
if [ $osch -eq 1 ] ; then
echo "You Pick up Unix (Sun Os)"
else #### nested if i.e. if within if ######
if [ $osch -eq 2 ] ; then
echo
"You Pick up Linux (Red Hat)"
else
echo
"What you don't like Unix/Linux OS."
fi
fi
Run the above shell script as follows:
$ chmod +x nestedif.sh
$ ./nestedif.sh
1. Unix (Sun Os)
2. Linux (Red Hat)
Select you os choice [1 or 2]? 1
You Pick up Unix (Sun Os)
$ ./nestedif.sh
1. Unix (Sun Os)
2. Linux (Red Hat)
Select you os choice [1 or 2]? 2
You Pick up Linux (Red Hat)
$ ./nestedif.sh
1. Unix (Sun Os)
2. Linux (Red Hat)
Select you os choice [1 or 2]? 3
What you don't like Unix/Linux OS.
Note that Second if-else constuct is nested in the first else statement. If the condition in the first if statement is false the the condition in the second if statement is checked. If it is false as well the final elsestatement is executed.
You can use the nested ifs
as follows also:
Syntax:
if condition
then
if condition
then
.....
..
do this
else
....
..
do this
fi
else
...
.....
do this
fi
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