Command line tipps

Unless you are doing some sort of cropping there is no reason to load up Photoshop or the Gimp. A simple command will usually suffice for almost all your image resizing needs.

convert -resize 300 image.jpg image-small.jpg

If you finding yourself doing lots of image resizing during the day, this command could potentially save you a LOT of time. You can even do mass image resizing.

I found myself spending a ton of time adding drop shadows to images. Using a simple command I was able to create drop shadows in seconds.

convert screenshot.jpg \( +clone -background black -shadow 60×5+0+5 \) +swap -background white -layers merge +repage shadow.jpg

Note: You must have Imagemagick installed for this command to work. Debian/Ubuntu users can use apt-get install imagemagick.

Obviously, I don’t expect you to memorize this command. To shorten it use an alias.

If you want simple MP3 splicing this command has your back:

cat 1.mp3 2.mp3 > combined.mp3

DD is one the most simplistic and powerful image applications out there.

dd if=/dev/hda of=/dev/hdb

Why open up K3B or some other program just to burn an ISO? Map this command to an alias and get burning.

cdrecord -v speed=8 dev=0,0,0 name_of_iso_file.iso

Note: You need to get the info for the ‘dev=’ part by running ‘cdrecord -scanbus’

Let’s say you want to convert an AVI to an Mpeg file:

ffmpeg -i video_origine.avi video_finale.mpg

Or convert an Mpeg to AVI:

ffmpeg -i video_origine.mpg video_finale.avi

There are all sorts of things you can do with ffmpeg.

No need to open up a GUI text editor when you have sed.

This command from Eric’s Wendelin’s blog will replace all instances of a color in CSS with another one.

sed ’s/#FF0000/#0000FF/g’ main.css



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