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Full Discussion: help with understanding script
Top Forums UNIX for Dummies Questions & Answers help with understanding script Post 302474219 by iluvsushi on Tuesday 23rd of November 2010 03:48:51 PM
Old 11-23-2010
help with understanding script
i am trying to understand this script example. the text does not explain it. can someone tell me briefly what each of the functions do. any help will be appreciated.
Code:
#!/bin/bash

killtree() {
    local _pid=$1
    local _sig=${2-TERM}
    for _child in $(ps -o pid --no-headers --ppid ${_pid}); do
        killtree ${_child} ${_sig}
    done
    kill -${_sig} ${_pid}
}

if [ $# -eq 0 -o $# -gt 2 ]; then
    echo "Usage: $(basename $0) <pid> [signal]"
    exit 1
fi

killtree $@
#
#       ......
#
while [ $(ps -p $! -o etime= | tr -d ": ") -lt 10000 ]
do
  sleep 60
done 2> /dev/null

kill -s SIGHUP $!

function my_ps()
function killps()   # kill by process name
{
   local pid pname sig="-TERM"   # default signal
   if [ "$#" -lt 1 ] || [ "$#" -gt 2 ]; then
       echo "Usage: killps [-SIGNAL] pattern"
       return;
   fi
   if [ $# = 2 ]; then sig=$1 ; fi
   for pid in $(.............) ; do
       pname=$(................... )
       if ask "Kill process $pid <$pname> with signal $sig?"
           then kill $sig $pid
       fi
   done
}
_killall ()
{
    COMPREPLY=( $( /bin/ps -u $USER -o comm  | \
        sed -e '1,1d' -e 's#[]\[]##g' -e 's#^.*/##'| \
        awk '{if ($0 ~ /^$USER/) print $0}' ))

    return 0
}
complete -F _killall killall killps

Last edited by Scott; 11-23-2010 at 04:54 PM.. Reason: Code tags, please...
 

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LEARN ABOUT DEBIAN

opal::manipulate

manipulate(3pm) 					User Contributed Perl Documentation					   manipulate(3pm)

NAME

       OpaL::manipulate - Perl extension for manipulating files.

SYNOPSIS

	 use OpaL::manipulate qw(functions);

       No functions or variables are exported automaticly so you have to specify them here.

DESCRIPTION

       OpaL::manipulate is a module for manipulating files.

       All functions are autoloaded so they will not be loaded into memory if you have not used them before.

FUNCTIONS

       perlmodifyadvanced
	   It simply applies the script to the file to change its content.  You also have to apply a message to tell what you are doing mostly for
	   debugging and if any error occures. The error level tells how critical this action is to the script.

	   USAGE:
	       "perlmodifyadvanced"("file", "script",
				  "message", errorlevel);

	   The errorlevel is optional.

       perlmodify
	   It simply fixes some stuff in the script string and then calls perlmodifyadvanced.

	   USAGE:
	       "perlmodify"("file", "script",
			  "message", errorlevel);

	   The errorlevel is optional.

       perlmodify_insertafter
	   This function searches for something (regular expression). It if is found it inserts the text after it. But it will never insert the
	   text twice.

	   You also have to apply a message to tell what you are doing mostly for debugging and if any error occures. The error level tells how
	   critical this action is to the script.

	   USAGE:
	       "perlmodify_insertafter"("file", "find", "text",
				      "message", errorlevel);

	   The errorlevel is optional.

AUTHOR

       Ola Lundqvist <ola@inguza.com>

REQUIRES

       OpaL::action, OpaL::read.

SEE ALSO

       OpaL::action

       OpaL::read

       perl(1)

perl v5.10.1							    2009-04-21							   manipulate(3pm)
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