Commands by unixmonkey6437 (1)

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Recursively remove directory with many files quickly
rsync'ing an empty directory over a directory to be deleted recursively is much faster than using rm -rf, for various reasons. Relevant only for directories with really a lot of files.

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.

Command to logout all the users in one command

Remove a file whose name begins with a dash ( - ) character
Using the redundant ./ directory information prevents the dash from occurring at the beginning of the filename, and being interpreted as an option of the rm command. Also works using: $ rm -- -filename

Print number of mb of free ram
This will show the amount of physical RAM that is left unused by the system.

power off system in X hours form the current time, here X=2

Listing today’s files only

list files recursively by size

Create a tar of directory structure only

Print a row of 50 hyphens
Perl is installed by default on most modern OS when jot is not.


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