while loop shell code example

Example 1: while loop bash

while true;
do
	#code
done

Example 2: while loop shell script

#!/bin/sh

a=0

while [ $a -lt 10 ]
do
   echo $a
   a=`expr $a + 1`
done

Example 3: shell script:while done

# The syntax is as follows:

while [ condition ]
do
   command1
   command2
   command3
done

# command1 to command3 will be executed repeatedly till the 'condition'
# is true.
# The argument for a while loop can be any boolean expression.
# Infinite loop occurs when the conditional never evaluates to false.
# Here is the while loop for a one-liner syntax:

while [ condition ]; do commands; done
while control-command; do COMMANDS; done

# For example, the following while loop will print 'welcome x times' 5 times
# on the screen:



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


# as one-liner:
x=1; while [ $x -le 5 ]; do echo "Welcome $x times" $(( x++ )); done



# Here is a sample shell code to calculate factorial using while loop:



#!/bin/bash
counter=$1
factorial=1
while [ $counter -gt 0 ]
do
   factorial=$(( $factorial * $counter ))
   counter=$(( $counter - 1 ))
done
echo $factorial



# To run just type:
$ chmod +x script.sh
$ ./script.sh 5

Example 4: linux while loop

while true;
do
	#code
;done

Example 5: for while bash

Use for in bash for iterating words in a string or values in an array as:
for value in {1, 2, 3}; do echo $value; done
for value in $(cat arguments_files.txt); do [some_command]; done
And use while for iterating lines from a pipe output as:
cat arguments_file.txt | while read line; do [some_command]; done