Shortcut Function
ctl+k Clear the terminal window
ctl+t Open a new tab in the current window

Commands

Find the PID of a process listening on a port (pass the -i flag and the port number to significantly speed up the searching):

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$ lsof -Pi :3000
COMMAND   PID  USER   FD   TYPE            DEVICE SIZE/OFF NODE NAME
node    10832 yulin   27u  IPv4 0xc9491b9285959cf      0t0  TCP *:3000 (LISTEN)

Kill this process:

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$ kill 10832

Port 3000 is the default port used by Node.

Delete the .DS_Store file manually Get into the folder containing the .DS_Store file you want to delete.

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find . -name '.DS_Store' -type f -delete

The .DS_Store file will disappear.