Useful Linux Commands

Show what devices are connected to local network:
$ nmap -sP 10.0.0.ip/24

Download all PDFs from a webpage: $ wget --user=username --ask-password -r -l1 -H -t1 -nd -N -np -A.pdf -erobots=off http://path.to.page/

Reload .bashrc without logging back in:
$ . ~/.bashrc

Set github remote to use SSH instead of HTTPS:
$ git remote set-url origin git@github.com:username/your-repository.git

Print file from command line:
$ lp /path/to/file

Display the file system disk space usage in human readable form:
$ df -h

Make an audio recording:
$ arecord /path/to/filename.wav

Switch back to last working directory $ cd -

Unfreeze your Linux terminal from accidental Ctrl+S Ctrl+Q

Move to beginning/bnd of terminal line
Ctrl+A / Ctrl+E

Open a new terminal tab
Shift + Ctrl + T

View file in terminal cd - $ less <filename>

Reverse Search
Ctrl+R

List all commands available in current session
compgen -c

Close current window
Ctrl+Q or the classic Alt+F4

Remove prefix from all files in working directory for file in pref_*; do mv "$file" "${file#pref_}";done;