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 FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

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