User Management

usermod - modify user settings. Add a user to a group

usermod -a -G <examplegroup> <exampleusername>

E.g. add user geek to the sodo group:

usermod -a -G sudo geek

File System Tools

du: disk usage - Summarize disk usage of the set of FILEs, recursively for directories.

du -d2 -h

df - Show information about the file system on which each FILE resides, or all file systems by default.

df -h

ssh - Secure Shell Connect to a remote host

ssh <user>@<host name / ip address>

Run a command on the remote host

ssh <user>@<host name / ip address> '<command to run>'