16.break-continue.txt

break
------

Based on some condition, if we want to beak loop execution (i.e to come out of loop) then we should go for break statement.

#! /bin/bash
i=1
while [ $i -le 10 ]
do
   if [ $i -eq 5 ];then
	break
   fi
   echo $i
    let i++
done

	
______________________________________

continue statement:
------------------

We can use coninue statement to skip current itereation and continue for the next iteration.
# to print odd numbers.
#! /bin/bash
i=0
while [ $i -le 10 ]
do 
	let i++
	if [ $[i%2] -eq 0 ];then
		continue
	fi
	echo $i
done

******Output*********
[abhijit@localhost ~]$ ./test36.sh
1
3
5
7
9
11
***********************


Q. write a script to read file name and display its content.
with extra masala to this script.

#! /bin/bash

while [ true ]
do 
	read -p " enter file name to display its content: " fname
	#check whether file exist/regular file or not.
	if [ -f $fname ];then
		echo "the content of $fname: "
		cat $fname
	else
		echo "$fname may not exist/regular file"
	fi
	read -p "do you want to display content of another file[yes/no]: " option
	case $option in
		[yY]|[yY][eE][sS])
			continue
			;;
		[nN]|[nN][oO])
			break
			;;
		*)
			echo "please select one of Yes|No only."
			;;
	esac
done
echo "thanks for using application"

________________________________________________________

Q. Write a script that reads a astring as input and print its reverse?

#! /bin/bash

read -p "enter any string to find reverse: " str
len=$(echo -n $str | wc -c)
output=""

while [ $len -ge 1 ]
do
	ch=$(echo -n $str | cut -c $len)
	output=$output$ch
	let len--
done
echo "the original string: $str"
echo "the reversed string: $output"