if|if

home
if
- if-fi
- if-else
- if-elif
Loops
- while
- for

syntax of if

if [ expresion ]
then
statement to be executed if expresion is true
fi

Important notice

if expression is a shell comand, then it will be
assumed true if it return 0 after execution
If it is a boolean expression, then it would be true
if it returns true
Space between braces and expression it's important because
no space produce a syntax error
"fi"is "if backward

Exemple

#!/bin/sh
var1=20
var2=10 if[ var1==1var2 ]
then
echo "var1 is equal var2"
fi