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Make less act like cat if its input's contents can fit on one screen

show lines that appear in both file1 and file2

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.

Rename file to same name plus datestamp of last modification.
FILENAME=nohup.out mv -iv $FILENAME{,.$(stat -c %Y $FILENAME)} does it help ?

Find the package that installed a command

Rsync using SSH and outputing results to a text file
--delete will delete copies on remote to match local if deleted on local --stats will output the results -z zip -a archive -A preserve ACL -x don't cross filesystem boundaries -h human readable -e specify the remote shell to use

Rename files in batch

Get HTTP status code with curl

Extract audio from a video

Beep siren
Infinitely plays beeps with sinusoidally changing sound frequency. Ideal for alarm on an event.


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