A list of useful commands that only get used once in a blue moon

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Groff - A text formatter

- To convert man pages:

groff -T html -mandoc '<input manpage>' > <file_name>.html

Mogrify - An image manipulator

- To resize image by 50%:

mogrify -resize 50% <image.jpg>

- To resize image to 256px * 256px:

mogrify -resize 256x256 <image.jpg>

-To convert from png to jpg:

mogrify -format jpg *.png