Bash shell supports following
while loop in Shell scripting
Here is a sample where you can find the while loop which execute the commands until it reaches condition false for factorial number the iterate start with i that is initial value. Loop decrements i value and reaches to 0 then it exits.
#!/bin/bash
if [ "$#" -ne 1 ]; then
echo "Usage: $0 Number" >&2
exit 1
fi
i=$1
f=1
echo "Given number is: " $1
while [ $i -gt 0 ]
do
f=$(( $f * $i ))
i=$(( $i - 1 ))
echo "iterating $i"
done
echo "Factorial of "$1 " is " $f
Execution outcome is for you...
The for loop in Shell script
#!/bin/bash
# Description : This script illustrate how to use for loop
for i in `ls`
do
if [ -f $i ];
then
echo $i is file
elif [ -d $i ];
then
echo $i is directory
fi
done
Execution of this for example...
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