gnuWorldOrder_13x12

from GNU World Order Linux Cast · host Klaatu

![CDATA[ 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](https://www.gnu.org/software/libc/manual/html_node/Example-of-Getopt.html) A great article about the `eval` and `set` on [Linux Journal](https://www.linuxjournal.com/content/bash-preserving-whitespace-using-set-and-eval) [Watchdog daemon](http://www.sat.dundee.ac.uk/psc/watchdog/watchdog-testing.html) [Systemd interface to Watchdog](http://0pointer.de/blog/projects/watchdog.html) ]]

Episode metadata supplied by the publisher feed · Published Mar 18, 2019

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