ssh root@remoteIP /usr/bin/ls 

##</code><code>##

system("ssh root@remoteIP /usr/bin/ls"); 

##</code><code>##

ssh: Could not resolve hostname root.remoteIP: Name or service not known remoteIP is the real IP address of the remote computer. 

##</code><code>##

ssh root@remoteIP /usr/bin/ls

##</code><code>##

system("ssh root\@\remoteIP /usr/bin/ls");