shebang

#!/bin/bash

stdout to var

# whole output
var="$(ls -al)"

# last line
var="$(ls -al | tail -1)"

Script parameters

• $* Returns a single string (``$1, $2 … $n’’)
• $1, $2 ... $n Refers to a numbered argument to the script
• $0 Refers to the name of the script itself
• $# Refers to the number of arguments

• Check if arguments are available

    if [ $# -eq 0 ]
      then
        echo "No arguments supplied"
    fi
  

• Switch Case

    case "$1" in
      "foo")
        doFoo
        ;;
      "bar")
        doBar
        ;;
      *)
        echo "You have failed to specify what to do correctly."
        exit 1
        ;;
    esac