Bash if elif else fi

Bash If..elif..else..fi

if [ conditional expression1 ]
  then
    statement1
    statement2
elif [ conditional expression2 ]
  then
    statement3
    statement4
  else
    statement5
fi

example

  if [ "$opt" = "some string" ]; then
    some_command
  fi

OR example

 if [[ "$VARIABLE" == "something" || "$VARIABLE" == "else" ]]; then</nowiki>
    some_command
 fi

conditional based on string compare

if a variable contains a string...

 string='foobar'
 if [[ $string == *"bar"* ]]; then
   echo "your bar is in my foo!"
 fi