The smbclient command line application included in Backtrack Linux is a staple for pentesting. I would imagine anyone that has done a pentest has used it to quickly verify SMB (Server Message Block) or CIFS (Common Internet File System) shares. The smbclient manpage describes it as a FTP-like client to access SMB/CIFS resources on servers. Below we describe varios smbclient commands in details to provide a basic understanding of its capabilities and what output will look like when using this tool in Backtrack Linux.
The ss command is not necessarily specific to Backtrack but is typically included in most Linux or UNIX distributions. This is definitely a core utility though that should be in any pen testers arsenal as it provides great information about any type of socket socket including DCCP sockets, RAW sockets, TCP sockets, UDP sockets and UNIX sockets. There are various switches that are useful based on the task and below I go into multiple examples of using switches for different scenarios.