linux script :Using while loop

http://www.cyberciti.biz/faq/bash-while-loop/

bash while loop syntax

while [ condition ]
do
command1
command2
command3
done

================================
Example:

#!/bin/bash
x=1
while [ $x -le 5 ]
do
echo "Welcome $x times"
x=$(( $x + 1 ))
done

=======================================

#!/bin/bash
while :
do
 echo "infinite loops [ hit CTRL+C to stop]"
done

==========================================

Conditional while loop exit with break statement

while [ condition ]
do
  statements1      #Executed as long as condition is true and/or, up to a disaster-condition if any.
  statements2
 if (disaster-condition)
 then
 break           #Abandon the while lopp.
 fi
 statements3          #While good and, no disaster-condition.
done