Functions

General

• When a function is invoked the positional parameters to the script are replaced by the params to the function. When the function finishes, they are restored
• declare local variables to the function using the local keyword
• functions can access shell variables that are part of the global scope
• in the absence of specifying a return value, a function returns the exit status of the last command executed

Syntax

function_name () {
  statements
}

Examples

• Simple example

douche() {
  echo "You are a douche"
}
echo "script starting"
douche
echo "script ending"