What does a shell script look likeI in Linux?

Answer 1

Something like this:

#!/bin/sh

### BEGIN INIT INFO

# Provides: mpd

# Required-Start: $local_fs $remote_fs

# Required-Stop: $local_fs $remote_fs

# Should-Start: autofs $network $named alsa-utils pulseaudio

# Should-Stop: autofs $network $named alsa-utils pulseaudio

# Default-Start: 2 3 4 5

# Default-Stop: 0 1 6

# Short-Description: Music Player Daemon

# Description: Start the Music Player Daemon (MPD) service

# for network access to the local audio queue.

### END INIT INFO

. /lib/lsb/init-functions

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

NAME=mpd

DESC="Music Player Daemon"

DAEMON=/usr/bin/mpd

MPDCONF=/etc/mpd.conf

START_MPD=true

# Exit if the package is not installed

[ -x "$DAEMON" ] exit 0

# Read configuration variable file if it is present

[ -r /etc/default/$NAME ] && . /etc/default/$NAME

if [ -n "$MPD_DEBUG" ]; then

set -x

MPD_OPTS=--verbose

fi

DBFILE=$(sed -n 's/^[[:space:]]*db_file[[:space:]]*"\?\([^"]*\)"\?/\1/p' $MPDCONF)

PIDFILE=$(sed -n 's/^[[:space:]]*pid_file[[:space:]]*"\?\([^"]*\)"\?/\1/p' $MPDCONF)

mpd_start () {

if [ "$START_MPD" != "true" ]; then

log_action_msg "Not starting MPD: disabled by /etc/default/$NAME".

exit 0

fi

log_daemon_msg "Starting $DESC" "$NAME"

if [ -z "$PIDFILE" -o -z "$DBFILE" ]; then

log_failure_msg \

"$MPDCONF must have db_file and pid_file set; cannot start daemon."

exit 1

fi

PIDDIR=$(dirname "$PIDFILE")

if [ ! -d "$PIDDIR" ]; then

mkdir -m 0755 $PIDDIR

if dpkg-statoverride --list --quiet /run/mpd > /dev/null; then

# if dpkg-statoverride is used update it with permissions there

dpkg-statoverride --force --quiet --update --add $( dpkg-statoverride --list --quiet /run/mpd ) 2> /dev/null

else

# use defaults

chown mpd:audio $PIDDIR

fi

fi

start-stop-daemon --start --quiet --oknodo --pidfile "$PIDFILE" \

--exec "$DAEMON" -- $MPD_OPTS "$MPDCONF"

log_end_msg $?

}

mpd_stop () {

if [ -z "$PIDFILE" ]; then

log_failure_msg \

"$MPDCONF must have pid_file set; cannot stop daemon."

exit 1

fi

log_daemon_msg "Stopping $DESC" "$NAME"

start-stop-daemon --stop --quiet --oknodo --retry 5 --pidfile "$PIDFILE" \

--exec $DAEMON

log_end_msg $?

}

# note to self: don't call the non-standard args for this in

# {post,pre}{inst,rm} scripts since users are not forced to upgrade

# /etc/init.d/mpd when mpd is updated

case "$1" in

start)

mpd_start

;;

stop)

mpd_stop

;;

status)

status_of_proc -p $PIDFILE $DAEMON $NAME

;;

restart|force-reload)

mpd_stop

mpd_start

;;

force-start)

mpd_start

;;

force-restart)

mpd_stop

mpd_start

;;

force-reload)

mpd_stop

mpd_start

;;

*)

echo "Usage: $0 {start|stop|restart|force-reload}"

exit 2

;;

esac