The journey through the util-linux from the a package set of Slackware continues. First, a tutorial on getopt, an argument parser for Bash and Tcsh. Here is a demonstrative sample script:

#!/usr/bin/bash ## or you can just use /bin/sh

OPTS=getopt --options f --long foo --alternative -- "$@"

eval set -- "$OPTS" echo "Raw input: $OPTS"

while true ; do case "$1" in -f|--foo) echo "Option f has been toggled on" ; shift ;; --) shift ; break ;; esac done

# this outputs anything # left over after parsing # valid options for i in "$@" ; do echo "$i" done

You can add more options, and you can add an allowance for arguments. Here is a slightly more complex version of the script:

#!/usr/bin/bash

OPTS=getopt --options f,b: --long foo,bar: --alternative -- "$@" eval set -- "$OPTS" echo "$OPTS"

while true ; do case "$1" in -f|--foo) echo "Option f has been toggled on" ; shift ;; -b|--bar) echo "Option b has been set to $2" ; shift 2 ;; --) shift ; break ;; esac done

for i in "$@" ; do echo "$i" done

After the coffee break, Klaatu covers kill. Because he recorded this episode on the same night as the previous episode, he does make reference to some settings from the previous episode (specifically, a hostname setting). That makes this episode a sequel to the previous one, meaning Klaatu owes you an extra episode sometime.

Also, mountpoint, mount, unmount, wdctl and watchdog

gnu.org/software/libc/manual/html_node/Example-of-Getopt.html A great article about the eval and set on Linux Journal Watchdog daemon Systemd interface to Watchdog

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