Listing and Counting Processes with a Certain Name

Listing and Counting Processes with a Certain Name

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The -C option can be used with ps to display certain processes:

$ ps -C httpd
PID TTY          TIME CMD
726 ?        00:00:00 httpd
732 ?        00:00:00 httpd
6064 ?        00:00:00 httpd
19452 ?        00:00:00 httpd
21047 ?        00:00:00 httpd
21048 ?        00:00:00 httpd
21049 ?        00:00:00 httpd
21060 ?        00:00:00 httpd
30127 ?        00:00:00 httpd
31629 ?        00:00:00 httpd
32380 ?        00:00:00 httpd
32381 ?        00:00:00 httpd
32620 ?        00:00:00 httpd
532 ?        00:00:00 httpd
533 ?        00:00:00 httpd
544 ?        00:00:00 httpd
1699 ?        00:00:00 httpd
1774 ?        00:00:00 httpd
2686 ?        00:00:00 httpd
3427 ?        00:00:00 httpd
3429 ?        00:00:00 httpd
3430 ?        00:00:00 httpd
12571 ?        00:00:00 httpd
12573 ?        00:00:00 httpd
12574 ?        00:00:00 httpd
$

Run this through wc to count the processes:

$ ps -C httpd h | wc -l
24
$

The h option doesn't print the header, so the count is correct. The -l option for wc just prints the number of lines. Add this line to your .bashrc file to get an alias to count these processes:

alias ch="ps -C httpd h | wc -l";

and you can then just type ch to count the httpd processes.

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