Process running? Stop it Post: 302500815

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Top Forums Shell Programming and Scripting Process running? Stop it Post 302500815 by Corona688 on Tuesday 1st of March 2011 03:35:35 PM

03-01-2011

Registered User

Quote:

Originally Posted by LukasB

Thank you! Sorry I am a newbie. So, the whole script would be like this?

Your code isn't that bad actually, there's just a few things to learn which will help simplify what you do. Remember you can use 'exit' to make the script quit at any time, which helps avoid n+1 levels of nested nesting.
Also get in the habit of bracketing and quoting your variables. The quotes prevent things from being split into several arguments when you end up with spaces in filenames and such. And the brackets let you "${put}_${together}_${variables}" when "$it_$wont_$work_$without_$them": (because _ is a valid char for a variable name, making it look for $it_ instead of $it, etc.

Code:

#!/bin/bash

PIDFILE="/tmp/php.pid"
PHPSCRIPT="/home/www/mydomain.com/subdomains/www/parser.php"

echo 'Checking php process from PID file'
# We can split this out to reduce the amount of nesting
if [ ! -f "$PIDFILE" ]
then
        echo "Hey no file - first time maybe?"
        # Don't need the & after $PIDFILE.
        php $PHPSCRIPT & echo $! > "$PIDFILE"
        # not all shells need this, but bash does
        disown
        # Script will quit here.
        exit 0
fi

# We know the PID file must exist to get to this point.

# cat is not needed here.  read and redirection are much more direct and efficient.
read PID < "$PIDFILE"

# Don't need to run ps and grep.
# All running processes will have directories under /proc.
# Things under /proc/ aren't really files and directories, it's a direct view
# of what the kernel believes is going on.
if [ -d "/proc/$PID" ]
then
        echo "php process still running - let us kill it!!!"
        kill "$PID" || echo "Couldn't kill $PID"
else
        echo "php process not running - crap!!!"
        rm -f "$PIDFILE"
        # You don't need the & after $PIDFILE.
        php "$PHPSCRIPT" & echo $! > "$PIDFILE"
        # not all shells need this, but bash does
        disown
fi

Ideally, your PHP script should be responsible for making, and deleting, its own PID file.

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LEARN ABOUT CENTOS

pppoe-connect

PPPOE-CONNECT(8)					      System Manager's Manual						  PPPOE-CONNECT(8)

NAME

       pppoe-connect - Shell script to manage a PPPoE link

SYNOPSIS

       pppoe-connect [config_file]

       pppoe-connect interface user [config_file]

DESCRIPTION

       pppoe-connect  is  a  shell  script  which  manages a PPPoE connection using the Roaring Penguin user-space PPPoE client.  If you omit con-
       fig_file, the default file /etc/sysconfig/network-scripts/ifcfg-ppp0 is used.  If you supply interface and user,  then  they  override  the
       Ethernet interface and user-name settings in the configuration file.

       Note that normally, you should not invoke pppoe-connect directly.  Instead, use pppoe-start to bring up the PPPoE connection.

       pppoe-connect  first  reads a configuration file.  It then brings up a PPPoE connection.  If the connection ever drops, a message is logged
       to syslog, and pppoe-connect re-establishes the connection.  In addition, each time the connection is dropped  or  cannot  be  established,
       pppoe-connect executes the script /etc/ppp/pppoe-lost if it exists and is executable.

       The shell script pppoe-stop causes pppoe-connect to break out of its loop, bring the connection down, and exit.

TECHNICAL DETAILS

       pppoe-connect uses the following shell variables from the configuration file:

       ETH    The Ethernet interface connected to the DSL modem (for example, eth0).

       USER   The PPPoE user-id (for example, b1xxnxnx@sympatico.ca).

       PIDFILE
	      A file in which to write the process-ID of the pppoe-connect process (for example, /var/run/pppoe.pid).  Two additional files ($PID-
	      FILE.pppd and $PIDFILE.pppoe) hold the process-ID's of the pppd and pppoe processes, respectively.

       By using different configuration files with different PIDFILE settings, you can manage multiple PPPoE connections.  Just specify  the  con-
       figuration file as an argument to pppoe-start and pppoe-stop.

AUTHOR

       pppoe-connect was written by David F. Skoll <dfs@roaringpenguin.com>.

       The pppoe home page is http://www.roaringpenguin.com/pppoe/.

SEE ALSO

       pppoe(8),  pppoe-start(8),  pppoe-stop(8), pppd(8), pppoe.conf(5), pppoe-setup(8), pppoe-status(8), pppoe-sniff(8), pppoe-server(8), pppoe-
       relay(8)

4th Berkeley Distribution					 21 February 2000						  PPPOE-CONNECT(8)