How do I check if a service is running in Linux?

[petulia3478]

To check whether the httpd service is running:

$ /sbin/service httpd status
httpd (pid  2352) is running...

To check the status of all services:
[output is truncated]

$ /sbin/service --status-all
anacron is stopped
atd (pid  2423) is running...
auditd (pid  1944) is running...
automount is stopped