Commands by rsimpson (3)

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Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

reverse order of file

Find the package that installed a command

simple port check command

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

List your largest installed packages (on Debian/Ubuntu)

List alive hosts in specific subnet
Works on any machine with nmap installed. Previous version does not work on machines without "seq". Also works on subnets of any size.

Create the directoty recursively

check web server port 80 response header


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