GNU World Order Linux Cast

Util-link continued, starting with the utilities in /sbin:

* sbin/adjtimex

* sbin/agetty

* sbin/blkdiscard

* sbin/blkid

* sbin/blockdev

* sbin/cfdisk

Plus some listener feedback about getopt and getopts, bzip2, good bad sound,

and more.

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Let's build a flatpak together!

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Listener feedback. GNU World Order is voted best Linux Podcast of 2018 by

[linuxquestions.org](http://linuxquestions.org) but fame is fleeting, and it

is no longer 2018. Bzip2 compression. You should run bzip2 compression tests

and send Klaatu your results. Controversy over scripts that download and

install automatically. A bakery that runs on Emacs and PostgreSQL. Further

Grav commentary. Pico CMS. And more!

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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)

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Heaps of listener feedback about licensing, the difference between a user and

a developer, the `atool` archive tool, old GNU World Order shownotes, the

first couple of applications from **util-linux**: `dmesg`, `findmnt`,

`hostname`, `more`.

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Coffee across the globe. From the **a** package set of default Slackware

packages: udisks, udisks2 (udiskctl), unarj, upower, usb_modeswitch, usbutils,

and the utemptor interface to utmp, btmp, and wtmp.

Udisks is a friendly interface for interacting with drives.

$ udisks --enumerate

/org/freedesktop/UDisks/devices/sdc1

/org/freedesktop/UDisks/devices/sdc2

/org/freedesktop/UDisks/devices/sdc

/org/freedesktop/UDisks/devices/sde

[...]

/org/freedesktop/UDisks/devices/sdf1

$ udisks --mount /dev/sdf1

Mounted /org/freedesktop/UDisks/devices/sdf1 at /media/white8gb

$ udisks --unmount /dev/sdf1

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Episode audio levels adjusted, Flatpak tips, and three great coffees in

downtown Raleigh North Carolina. Finishing up the applications-that-start-

with-"t" from the **a** set of Slackware: `time` (not the built-in Bash one)

and **tree**.

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Webhosting.coop vouchers, THE CLOUD is just a virtual computer on somebody

else's (or your own?) cluster of computers, building dependencies on things

you already own.

In the **t** packages in the **a** set: heaps of tar tips, and some thoughts

about tcsh.

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Deep thoughts about licensing, effective licensing, and why groups of free

software developers haven't the luxury of turning a blind eye.

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Tech talk, licensing, ZFS, and more.

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