How can I check which version of apache is installed on a Debian machine?

Question

The subject says it all. is there a command for doing this?

Answer 1

Try apachectl -V:

$ apachectl -V
Server version: Apache/2.2.9 (Unix)
Server built:   Sep 18 2008 21:54:05
Server's Module Magic Number: 20051115:15
Server loaded:  APR 1.2.7, APR-Util 1.2.7
Compiled using: APR 1.2.7, APR-Util 1.2.7
... etc ...

Answer 2

or, less directly, nmap -A localhost -p 80

Answer 3

thx tgamblin. For me apachectl -V did not work, but apachectl fullstatus gave me my version.

Answer 4

getting error saying that command not found