if list; then list; [ elif list; then list; ] ... [ else list; ] fi

The if list is executed. If its exit status is zero, the then
list is executed. Otherwise, each elif list is executed in
turn, and if its exit status is zero, the corresponding then
list is executed and the command completes. Otherwise, the else
list is executed, if present. The exit status is the exit sta-
tus of the last command executed, or zero if no condition tested
true.

A veces es deseable disponer de un servicio personalizado en /etc/init.d

El método más rápido consiste en copiar un script de los que tengamos en /etc/init.d y retocarlo a nuestro gusto. Aparecerá en la herramienta Servicios (menú Sistema, aunque podemos llamarla desde consola con services-admin)

Por ejemplo, un servicio que borre el tmp mediante la orden /etc/init.d/borra-tmp start puede ser:

#!/bin/sh

set -e

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

usage () {cat << END$initd options:

start

Borra la carpeta tmp

clear

no usado

END

}

case "$1" instart)rm -r /tmp/*

;;

clear)

;;*)if test "$@"; then

echo "Aborting iptables initd: unknown command(s): \"$@\"."

fi

usage

;;

esac

exit 0