Understanding Loop in Unix or Linux

Published: 17 May 2020
on channel: Interview Question Bank

364

Understanding Loop in Unix or Linux

loop in Unix and Linux:

a.for loop
b.while loop
c.until loop

What is a loop?
Something that iterates continuously.

Why we need?
If there is a repetitive task required we can use loop.

How to implement?

for(( index = 0;index less than 10;index++ ))
do
statements;

done

0 less than 10---true
1 less than 10---true
2 less than 10---true

10 less than 10---false

for(( initialization;condition;increment ))
do
statement;
done

while [ condition ]---true
do
statements;
done
exit condition

until [ condition ]---false
do
statements;
done
exit condition

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