nc – tcp/ip swiss army knife

ABOUT nc Netcat (often abbreviated to nc) is a computer networking utility for reading from and writing to network connections using TCP or UDP. Netcat is designed to be a dependable back-end that can be used directly or easily driven by other programs and scripts. At the same time, it is a feature-rich network debugging …

free – Display amount of free and used memory in the system

A UNIX Command $free total used free shared buffers cached Mem: 507008 432908 74100 0 14700 186816 -/+ buffers/cache: 231392 275616 Swap: 1485972 0 1485972 $free -m total used free shared buffers cached Mem: 495 422 72 0 14 182 -/+ buffers/cache: 225 269 Swap: 1451 0 1451 $ UNIX Explanation Display amount of free …