Exiting from a loop with a break statement in Linux bash script

In the previous tutorial, we discussed about how continue can be used to exit from the current iteration of a loop. The break command is another way to introduce a new condition within a loop. Unlike continue, however, it causes the loop to be terminated altogether if the condition is met.

In the for_12.sh script, we check the directory’s content. If the directory is found, then we are exiting the loop and displaying the message that the first directory is found:


rm -rf sample* 
echo > sample_1 
echo > sample_2 
mkdir sample_3 
echo > sample_4 
for file in sample* 
  if [ -d "$file" ]; then 
echo The first directory is $file 
rm -rf sample* 
exit 0 

Let’s test the program, as follows:

$ chmod +x for_12.sh
$ ./for_12.sh

The following will be the output after executing the preceding commands:


The first directory is sample_3

In the for_13.sh script, we ask the user to enter any number. We print the square of the numbers in the while loop. If a user enters the number 0, then we use the break command to exit the loop:


typeset -i  num=0 
while true 
  echo -n "Enter any number (0 to exit): " 
  read num junk 
  if (( num == 0 )) 
    echo "Square of $num is $(( num * num ))." 
echo "script has ended" 

Let’s test the program:

$ chmod +x for_13.sh
$ ./for_13.sh

The following will be the output after executing the preceding commands:


Enter any number (0 to exit): 1
Square of 1 is 1.
Enter any number (0 to exit): 5
Square of 5 is 25.
Enter any number (0 to exit): 0

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