While Loop

while loop in Shell Script

Syntax:

           while [ condition ]
           do
                 command1
                 command2
                 ...................
                 ...................
            done

The while will execute as long as the given condition specified is true. For example : The for loop in last posted program we can be writte that using while loop as follows:

#vi naturalnumber.sh

i=0
while [ $i -le 9 ]
do
  echo $i
  i=`expr $i + 1`
done

Save it and try as
$ sh naturalnumber.sh