Are you ready to let it run (y/n)? y
Pre-loading started at: Tue Jul 28 16:10:13 UTC 2015
Please wait for pre-loading to finish...

X records loaded into system in N seconds...
X records loaded into system in N seconds...
...

##</code><code>##

Are you ready to let it run (y/n)? y
Pre-loading started at: Tue Jul 28 16:10:13 UTC 2015
Please wait for pre-loading to finish...

File1 loaded...
File2 loaded...
...

X records loaded into system in N seconds...
X records loaded into system in N seconds...
...

##</code><code>##

$s1_output = $s1_cli->cmd("/path/to/pre-loader.pl arg1 arg2 2>&1");