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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>A short one-liner to keep a script from executing more than
one at a time (say a long running script kicked off from cron every minute that
runs more than a minute occasionally...<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>my @ps = `ps -ef | grep $0 | grep -v grep`; exit if ( @ps
> 1);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>and a more advanced version...<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>my @procs = grep /perl .*invan\.pl/, `ps axw`; <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>if (@procs > 1) { <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> unless ($ENV{USER} eq "jhannah")
{ # Hopefully that dork knows what he's doing, so let him do
whatever. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> die "Looks like I'm
already running. I refuse to run on top of myself.\n @procs"; <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> } <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>} <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><strong><b><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray'>Kenn Thompson</span></font></b></strong><o:p></o:p></p>
<p class=MsoNormal><st1:place w:st="on"><st1:PlaceName w:st="on"><font size=2
color=gray face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:gray'>Omni</span></font></st1:PlaceName><font size=2 color=gray
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:gray'> <st1:PlaceType
w:st="on">Hotels</st1:PlaceType> <st1:PlaceName w:st="on">Reservation</st1:PlaceName>
<st1:PlaceType w:st="on">Center</st1:PlaceType></span></font></st1:place><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=gray face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:gray'>Sr. Programmer/Analyst<br>
w:402.952.6521<br>
c:402.598.8818</span></font><font size=1><span style='font-size:7.5pt'><o:p></o:p></span></font></p>
<p><b><i><font size=2 color="#333333" face=Arial><span style='font-size:11.0pt;
font-family:Arial;color:#333333;font-weight:bold;font-style:italic'>Omni Hotels</span></font></i></b><i><font
size=2 color="#333333"><span style='font-size:11.0pt;color:#333333;font-style:
italic'> is proud to be ranked <b><span style='font-weight:bold'>“Highest
in Guest Satisfaction Among Upscale Hotel Chains”</span></b> in the J.D.
Power and Associates 2005 North America Hotel Guest Satisfaction Study<sup>SM</sup>.
</span></font><font color="#333333"><span style='color:#333333'><o:p></o:p></span></font></i></p>
<p class=MsoNormal><i><font size=1 color="#333333" face=Arial><span
style='font-size:7.5pt;font-family:Arial;color:#333333;font-style:italic'>(Study
based on 37,471 responses from guests who stayed in a hotel between December
2004 and May 2005. Fourteen upscale hotel chains were ranked in the
study. </span></font></i><i><font size=2 color="#333333"><span
style='font-size:11.0pt;color:#333333;font-style:italic'><a
href="http://www.jdpower.com" title="http://www.jdpower.com/"><font size=1
face=Arial><span style='font-size:7.5pt;font-family:Arial'>www.jdpower.com</span></font></a></span></font></i><i><font
size=1 color="#333333" face=Arial><span style='font-size:7.5pt;font-family:
Arial;color:#333333;font-style:italic'>) </span></font><font color="#333333"><span
style='color:#333333'><o:p></o:p></span></font></i></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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