Bash Tricks

bash_tricks.md

Passing arguments

• Verify is Supplied any argument

  ((!$#)) && echo No arguments supplied! && exit 1

• If you need to ensure a minimum ammount of args

  if [ $# -ge 3 ]
  then
    echo script has at least 3 arguments
  fi

In this case, if needed can use comparators (-eq, -lt, -ge, etc.) but only works for integer comparison For example:

  if [[ $# -eq 0 ]] ; then
    echo 'Must pass at least one argument'
    exit 1
  fi

References:

• Arguments: https://stackoverflow.com/questions/6482377/check-existence-of-input-argument-in-a-bash-shell-script