Functions
A function may return a value in one of four different ways:
- Change the state of a variable or variables
- Use the
exitcommand to end the shell script - Use the
returncommand to end the function, and return the supplied value to the calling section of the shell script - echo output to stdout, which will be caught by the caller just as c=`expr $a + $b` is caught
Example1:
myfunc()
{
echo "I was called as : $@"
x=2
}
### Main script starts here
echo "Script was called with $@"
x=1
echo "x is $x"
myfunc 1 2 3
echo "x is $x"
Example-2:
#!/bin/sh
factorial()
{
if [ "$1" -gt "1" ]; then
i=`expr $1 - 1`
j=`factorial $i`
k=`expr $1 \* $j`
echo $k
else
echo 1
fi
}
while :
do
echo "Enter a number:"
read x
factorial $x
done
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