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Show the date of easter
ncal -e shows the date of Easter this year. ncal -e YYYY shows the date of Easter in a given year. ncal -o works the same way, but for Orthodox dates.

Sort files in folders alphabetically
Creates one letter folders in the current directory and moves files with corresponding initial in the folder.

Convert a flv video file to avi using mencoder

Clean config from # and empty strings

Get the /dev/disk/by-id fragment for a physical drive
Substitute for #11720 Can probably be even shorter and easier.

Find the package that installed a command

Delete all but the latest 5 files
yes 6 (tail from 6th line)

Start dd and show progress every X seconds

notify yourself when a long-running command which has ALREADY STARTED is finished
If you want to be notified when a long-running command is finished, but you have already started it: CTRL+Z $ fg; echo "finished" | sendmail me@example.com I use a script to post a tweet, which sends me a txt: $ fg; echo "finished" | tweet

Screen enable/disable loggin in all windows
The command when added in screenrc enables logging all open windows by using the C-l (control-l key combination) and disable by C-o . The lines need to be added in separate lines .


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