> -----Original Message----- > From: redhat-list-bounces@xxxxxxxxxx > [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Steve Buehler > Sent: Monday, March 14, 2005 2:02 PM > To: redhat-list@xxxxxxxxxx > Subject: shell script to count httpd processes > > I am running RHL 7.3. > I am trying to create a shell script with /bin/sh that will > count how many httpd processes are running at the time. > This is how it would look as a perl script: > ---start of script--- > #!/usr/bin/perl > $count = 0; > @hits = (`ps -afe | grep httpd | grep -v grep`); > foreach $entry (@hits) { > $count++; > } > print "$count\n"; > ---end of script--- > > I am trying to do this in an sh script. Partly for learning > partly because I want to do some other things to, but can > only know how to do them in a shell script. Any help would > be greatly appreciated. > > Thanks > Steve > > -- > redhat-list mailing list > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/redhat-list > The following shell script should do the trick: --- start of script --- #!/bin/bash COUNT=`ps -aef | grep httpd | grep -c -v grep` echo $COUNT --- end of script --- If the reason for your question is to understand how to use a for loop, the following script will also work: --- start of script --- #!/bin/bash PROCIDLIST=`ps -aef | grep httpd | grep -v grep | awk '{print $2}'` for PROCID in $PROCIDLIST do COUNT=$((COUNT+1)) done echo $COUNT --- end of script Please note there is another syntax for the 'for' command, which looks like the following: ---- for (( statement1; statement2; statement3)) do statement block done ---- The above 'for' syntax works like the 'for' statement in C. Michael -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
