////////
# exit #
////////

## default code is 0 ##
//check-exit-code-afterwards 0
~> exit

## explicit code ##
//check-exit-code-afterwards 1
~> exit 1

## runs pre-exit hooks ##
//check-pre-exit-hook-afterwards
~> exit

## wrong arity ##
~> exit 1 2
Exception: arity mismatch: arguments must be 0 to 1 values, but is 2 values
  [tty]:1:1-8: exit 1 2

/////////////////////
# external commands #
/////////////////////

//only-on unix
//set-env PATH /bin

~> has-external sh
▶ $true
~> search-external sh
▶ /bin/sh
~> (external sh) -c 'echo external-sh'
external-sh
~> has-external random-invalid-command
▶ $false
~> search-external random-invalid-command
Exception: exec: "random-invalid-command": executable file not found in $PATH
  [tty]:1:1-38: search-external random-invalid-command