$ cat /etc/redhat-release
CentOS Linux release 7.1.1503 (Core)
$ sshd -V
unknown option -- V
OpenSSH_6.6.1p1, OpenSSL 1.0.1e-fips 11 Feb 2013
$ vsftpd -v
vsftpd: version 3.0.2
# httpd -v
Server version: Apache/2.4.6 (CentOS)
# perl -v
This is perl 5, version 16, subversion 3 (v5.16.3) built for x86_64-linux-thread-multi
(with 33 registered patches, see perl -V for more detail)
# php -v
PHP 5.4.16 (cli) (built: Nov 15 2017 16:33:54)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
# psql -V
psql (PostgreSQL) 9.2.23
# mysql -V
mysql Ver 15.1 Distrib 5.5.56-MariaDB, for Linux (x86_64) using readline 5.1