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To print a specific line from a file
You can get one specific line during any procedure. Very interesting to be used when you know what line you want.

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.

Doing some floating point calculations with rounding (e.g. at the 3rd decimal)

Outputs a 10-digit random number

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

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.

Create a backup of file being edited while using vi
At the start of a vi session and *before* saving any changes use ":!cp % %-" to make a backup of the current file being edited. example: vi /data/some/long/path/file :!cp% %- creates /data/some/long/path/file-

List the size of all sub folders and files from the current location, with sorting

Are the two lines anagrams?
This is just a slight alternative that wraps all of #7917 in a function that can be executed

Leap year calculation


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