Here are some useful Linux Commands :-
Enable SSHD
service sshd start
service sshd stop
service sshd status
Set Date/Time
date 0528114711 [MMDDhhmmYY(.ss)]
Directory space usage
du -h –max-depth=1 [Where 1 is the number of subdirectories to show]
Startup the SFTP service
service vsftpd start
Kernel/OS Version
uname -a