Useful commands
Reload current shell in place (useful for cleanly applying recent shell config updates)
Show current shell level (increases when launching additional shells via bash, zsh etc)
Clear the current screen of text
Time current command execution and output user and system timing information
Prevent computer from sleeping and declare user as active
caffeinate -u -t <seconds>
Other caffeinate options
-i Prevent system idle sleep
-m Prevent disk idle sleep
Generate MD5 and SHA1 hashes
Generate MD5 hash from file
Generate SHA1 hash from file
General maths interpreter (allows general equations entered into command line)
Calculate result of math query using bc
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