linux script if code example

Example 1: bash if statement

and - &&
or - ||

# and example
if [ -r $1 ] && [ -s $1 ]
then
echo This file is useful.
fi

# or example
if [ $USER == 'bob' ] || [ $USER == 'andy' ]
then
ls -alh
else
ls
fi

Example 2: if and if bash

if [ "${STATUS}" != 200 ] && [ "${STRING}" != "${VALUE}" ]; then

Example 3: bash if

#!/bin/bash

foo="qux"
bar="qux"

if [ "$foo" = "$bar" ]; then
    echo "The strings are equal."
else
    echo "The strings aren't equal."
fi

Example 4: ash if statment

if [ "$USER" == "Adam" ]
then
	echo "User is Adam"
else
	echo "User is not Adam"
fi