process conflicts

[James W. Meritt]

Is there some way for a script to "tell" if another process with the same
name is running?  I'm trying:
............................................................
#! /bin/csh -f
set j=`ps -ax|grep $0| grep -v grep | grep csh`
echo "got string< $j >- $#j long"
if ($#j != "7") then
      echo have more processes named $0 running
else
      echo only this process named $0 is running
endif
..........................................................

Except that the results are inconsistent, especially if the script is run via
cron.

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    jwm at sun4.jhuapl.edu or jwm at aplcen.apl.jhu.edu or meritt%aplvm.BITNET