Bash Functions

function_name() {
  commands
}

# Or with function keyword:
function function_name {
  commands
}

function_name # call function
function_name arg1 arg2 # call with arguments

$1, $2, ... # positional parameters
$@ # all arguments
$# # number of arguments

# Example:
greet() {
  echo Hello $1
}
greet John

return 0 # return success
return 1 # return error
echo value # return string via stdout

# Capture return:
result=$(function_name)

local var=value # local to function

# Example:
my_func() {
  local name=John
  echo $name
}