How to install rsync in Linux/Unix

rsync is a program that behaves in much the same way that rcp does, but has many more options and uses the rsync remote-update protocol to greatly speed up file transfers when the destination file already exists.

The rsync remote-update protocol allows rsync to transfer just the differences between two sets of files across the network link, using an efficient checksum-search algorithm described in the technical report that accompanies this package.

Debian or Ubuntu Linux

apt-get install rsync


sudo apt-get install rsync

Red Hat Enterprise Linux (RHEL)

up2date rsync

CentOS/Fedora Core Linux

yum install rsync

Check Apache version by PHP

Beside use command to check the version, you can use the php script to check the php version. Why that so? So application do need to verify by php first before allow you to install the apps.


$ar = split("[/ ]",$_SERVER['SERVER_SOFTWARE']);
for ($i=0;$i<(count($ar));$i++)
case 'APACHE':
$Apache_Version = $ar[$i];
case 'PHP':
$PHP_Version = $ar[$i];
case 'MOD_SSL':
$MOD_SSL_Version = $ar[$i];
case 'OPENSSL':
$OPENSSL_Version = $ar[$i];

Echo "Apache Version: $Apache_Version<br>\n";
Echo "PHP Version: $PHP_Version<br>\n";
Echo "mod_ssl Version: $MOD_SSL_Version<br>\n";
Echo "OpenSSL Version: $OPENSSL_Version<br>\n";