Explanation of the init.d/scripts Fedora
- by Shahmir Javaid
Below is a copy of vsftpd, i need some explanations of some of the scripts mentioned below in this script:
#!/bin/bash
#
### BEGIN INIT INFO
# Provides: vsftpd
# Required-Start: $local_fs $network $named $remote_fs $syslog
# Required-Stop: $local_fs $network $named $remote_fs $syslog
# Short-Description: Very Secure Ftp Daemon
# Description: vsftpd is a Very Secure FTP daemon. It was written completely from
# scratch
### END INIT INFO
# vsftpd This shell script takes care of starting and stopping
# standalone vsftpd.
#
# chkconfig: - 60 50
# description: Vsftpd is a ftp daemon, which is the program \
# that answers incoming ftp service requests.
# processname: vsftpd
# config: /etc/vsftpd/vsftpd.conf
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
RETVAL=0
prog="vsftpd"
start() {
# Start daemons.
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 1
[ -x /usr/sbin/vsftpd ] || exit 1
if [ -d /etc/vsftpd ] ; then
CONFS=`ls /etc/vsftpd/*.conf 2>/dev/null`
[ -z "$CONFS" ] && exit 6
for i in $CONFS; do
site=`basename $i .conf`
echo -n $"Starting $prog for $site: "
daemon /usr/sbin/vsftpd $i
RETVAL=$?
echo
if [ $RETVAL -eq 0 ]; then
touch /var/lock/subsys/$prog
break
else
if [ -f /var/lock/subsys/$prog ]; then
RETVAL=0
break
fi
fi
done
else
RETVAL=1
fi
return $RETVAL
}
stop() {
# Stop daemons.
echo -n $"Shutting down $prog: "
killproc $prog
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$prog
return $RETVAL
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart|reload)
stop
start
RETVAL=$?
;;
condrestart|try-restart|force-reload)
if [ -f /var/lock/subsys/$prog ]; then
stop
start
RETVAL=$?
fi
;;
status)
status $prog
RETVAL=$?
;;
*)
echo $"Usage: $0 {start|stop|restart|try-restart|force-reload|status}"
exit 1
esac
exit $RETVAL
Question I
What the hell is the difference between the && and || signs in the below commands, and is it just an easy way to do a simple if check or is it completely different to a if[..something..]; then ..something.. fi:
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 1
[ -x /usr/sbin/vsftpd ] || exit 1
Question II
i get what -eq and -gt is (equal to, greater than) but is there a simple website that explains what -x, -d and -f are?
Any help would be apreciated
Running Fedora 12 on my OS. Script copied from /etc/init.d/vsftpd
Question III
It says required starts are $local_fs $network $named $remote_fs $syslog but i cant see any where it checks for those.
