By: Dorris in Linux Tutorials on 2011-01-15
In Linux shell script,
if...else...fi is used to conditionally execute statements based on a condition.
The basic syntax for
if condition then statements else statements fi
condition is evaluated and if it is true, the statements within the
then block are executed, otherwise the statements within the
else block are executed.
For example, consider the following script that checks whether a number is even or odd:
#!/bin/bash echo "Enter a number:" read num if (( num % 2 == 0 )) then echo "$num is even." else echo "$num is odd." fi
In this script, the
read command is used to read a number from the user. Then, an
if statement is used to check whether the number is even or odd. If the number is even, the
echo command within the
then block is executed, otherwise the
echo command within the
else block is executed.
Note that the
((...)) syntax is used to perform arithmetic operations and the
-eq operator is used to compare two numbers for equality.
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