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This plugin does not find processes in the format 'interpreter /path/to/script', i.e. 'perl /usr/local/sbin/myscript.pl'. I also wanted to be able to just specify, in this case, 'myscript.pl'. My changes to add those:

@@ -70,12 +70,12 @@
fi

#calculate number of process
-nbproc=$(ps -A -o comm | grep -w $proc | grep -v $0 | wc -l)
+nbproc=$(ps -A -o args | grep -w "$proc" | grep -v $0 | grep -v grep | wc -l)
if [ $nbproc -gt 0 ]
then

#calculate age of oldest process
- ageproc=$(ps -A -o etime,comm,args | grep $proc | grep -v $0 | gawk '{split($1,t,":");split(t[1],td,"-");if (td[2]) {ta=td[1]*86400; t[1]=td[2]} else {ta=0}; if (t[3]) {$1=(t[1]*60+t[2])*60+t[3]+ta} else {$1=t[1]*60+t[2]};if (NR==1) {maxi=$1;} else {if ($1>maxi){maxi=$1;}}};END {print maxi}')
+ ageproc=$(ps -A -o etime,comm,args | grep "$proc" | grep -v $0 | grep -v grep | gawk '{split($1,t,":");split(t[1],td,"-");if (td[2]) {ta=td[1]*86400; t[1]=td[2]} else {ta=0}; if (t[3]) {$1=(t[1]*60+t[2])*60+t[3]+ta} else {$1=t[1]*60+t[2]};if (NR==1) {maxi=$1;} else {if ($1>maxi){maxi=$1;}}};END {print maxi}')
case $ageproc in
?|[0-5]? ) maxage=$ageproc" Seconds";;