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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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MARIA-VIS(1)						      General Commands Manual						      MARIA-VIS(1)

NAME
maria-vis - graph visualization script for maria SYNOPSIS
maria-vis DESCRIPTION
This manual page documents briefly the maria-vis command. maria-vis is a lefty script invoked by maria in order to visually present information to the user. The script reads commands and direc- tives from standard input and may write maria query language commands to standard output. An end-of-file condition on standard input ter- minates the script. The script is built on top of the dotty script that is part of the GraphViz package. The commands prefixed with visual in maria issue two kinds of commands to this script: new(); or add(); followed by a newline character and a graph definition in the dot input language. The new function in the script displays the graph in a new window, while the add function copies information from the graph to the last modi- fied graph. SEE ALSO
dot(1), dotty(1), lefty(1), maria(1). AUTHOR
This manual page was written by Marko Makela <msmakela@tcs.hut.fi>. The maria-vis script and the visualization option were designed and implemented by Marko Makela. Please see the copyright file in /usr/share/doc/maria for details. August 10, 2001 MARIA-VIS(1)
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