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Gli script in bash vanno ben oltre l’idea di semplici sequenze di comandi eseguiti l’uno dopo l’altro.
Si può persino avere GUI, interfacciarsi con altri programmi, mostrare notifiche, barre di scorrimento, finestre di dialogo.
Questo è un esempio di un semplicissimo player che utilizza zenity e rhythmbox-client per controllare un’instanza di rhythmbox.

#!/bin/bash
# Copyright (C) 2009 Lorenzo Sfarra

# Rhythmobx is running?
RHYTHMBOXPID=”`pidof rhythmbox`”
if [ “x$RHYTHMBOXPID” == “x” ]; then
# Launch rhythmbox…
rhythmbox &
else
echo “Found a rhythmbox instance with PID: $RHYTHMBOXPID”;
fi

RHYTHMBOX=”rhythmbox-client –no-start”

# ACTIONS AND INFOS
commands=( Pause Play Next Previous Info Details Close )
actionslist=””
command=”zenity –title Player –list –radiolist –column=* –column=Action “

# Add the commands to the list
for act in ${commands[@]}
do
actionslist=”$actionslist $act $act”
done
command=”$command $actionslist –height 300″

# Infinite loop
while [ 1 ]; do
action=”`$command`”
case “$action” in
Pause)
$RHYTHMBOX –pause
;;
Play)
$RHYTHMBOX –play
;;
Next)
$RHYTHMBOX –next
;;
Previous)
$RHYTHMBOX –previous
;;
Info)
# Display track name and track artist
playing=”`$RHYTHMBOX –print-playing`”
zenity –info –title “Now playing…” –text “$playing”
;;
Details)
# A detailed list of info about the currently played song
playing=”`$RHYTHMBOX –print-playing-format “%tt (%td) from %at (%ay, %ag) by %ta”`”
zenity –info –title “Details about the current track” –text “$playing”
;;
Close)
$RHYTHMBOX –quit
break;
;;
*)
break;
;;
esac
done

#vim: ai ts=2 sw=2 et sts=2

Per vedere il codice formattato e con l’highlight della sintassi, clicca qui.