linuxcommands.md

User Administration

Adding a user to a group

$ usermod -a -G GROUP USER  # Add USER to GROUP

Image manipulation

Converting image formats

• Using imageMagick. Image format is guessed from the extension. You can also specify new image height and width.

$ convert FROM_IMG TO_IMAGE

• Using inkscape. Gives better result than imageMagic for SVG image formats

$ inkscape -z -e TO_IMAGE FROM_IMAGE

Taking Screenshots

• Using imagemagick. Issuing this command will change the cusrsor to select a rectagular area. If clicked rather than selecting area entire active window will be captured. Image format will be guessed from the extension provided with the image name.

$ import NAME