Use these commands to check different versions of commonly installed services on your Linux Server on CentOS, Ubuntu, and Fedora.

CentOS/Fedora

Apache: /usr/sbin/httpd -v or httpd -v

Server version: Apache/2.2.29 (Unix) Server built: Oct 7 2014 11:35:25 Cpanel::Easy::Apache v3.26.8 rev9999Apache on cPanel: /usr/local/apache/bin/httpd -v

Server version: Apache/2.2.29 (Unix) Server built: Oct 7 2014 11:35:25 Cpanel::Easy::Apache v3.26.8 rev9999Curl: rpm -q curl

curl-7.19.7-40.el6_6.3.x86_64Bash: bash --version

GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu) Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later Exim: exim -bV

Exim version 4.84 #2 built 10-Sep-2014 15:02:41Glibc: ls /lib/libc-*

/lib/libc-2.12.so*Kernel: uname -r

2.6.32-042stab093.5PHP: php -v

PHP 5.4.33 (cli) (built: Oct 7 2014 11:48:26) Copyright (c) 1997-2014 The PHP Group Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend TechnologiesMySQL: mysql -v

Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 213432 Server version: 5.5.40-cll MySQL Community Server (GPL)CentOS/Fedora: cat /etc/redhat-release

CentOS release 6.6 (Final)

Ubuntu

Apache: /usr/sbin/apache2 -v or apache2 -v

Server version: Apache/2.4.7 (Ubuntu) Server built: Jul 22 2014 14:37:36Curl: curl --version

curl 7.35.0 libcurl/7.35.0 OpenSSL/1.0.1f zlib/1.2.8 libidn/1.28 librtmp/2.3Bash: bash --version

GNU bash, version 4.3.8(1)-release Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later GLibc: ldd --version

ldd (Ubuntu EGLIBC 2.19-0ubuntu6) 2.19 Copyright (C) 2014 Free Software Foundation, Inc.Kernel: uname -r

3.4.86PHP: php --version

PHP 5.5.9-1ubuntu4.5 (cli) (built: Oct 29 2014 12:33:19) Copyright (c) 1997-2014 The PHP GroupMySQL: mysql --version

mysql Ver 14.14 Distrib 5.5.40, for debian-linux-gnuUbuntu: lsb_release -a

No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04 LTS Release: 14.04 Codename: trusty

Other

OpenSSL: openssl version

OpenSSL 1.0.1e-fips 11 Feb 2013Pear: pear info pear | grep Version Plesk: cat /usr/local/psa/version Qmail: man qmail | grep version (This assumes any upgrades installed MAN pages.) sshd: /usr/sbin/sshd -v