if then bash file code example

Example 1: bash if else if

if [[ TEST-COMMAND ]]
then
  STATEMENTS1
else
  STATEMENTS2
fi

Example 2: codition in bash

# short if codition
[ $(( 2 + 2 )) -eq '4' ] && echo "yes"

# long if codition
if [ $(( 2 + 2 )) -eq '4' ]
then
  echo "yess"
fi