commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
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(relies on 'imagemagick')
Convert all .png files to .gif. This can also go the other way if you reverse the file extensions in the command, e.g.:
for file in *.gif; do convert "$file" "$(basename $file .gif).png"; done
If the file is named 'example1.png' it will be named 'example1.gif' when it is complete.
(relies on 'imagemagick')
This command will convert all .pdf files in a directory into a 800px (wide or height, whichever is smaller) image (with the aspect ratio kept) .jpg.
If the file is named 'example1.pdf' it will be named 'example1.jpg' when it is complete.
This is a VERY worthwhile command! People pay hundreds of dollars for this in the Windows world.
My .jpg files average between 150kB to 300kB, but your's may differ.
.daa is a non-standard disk image format that can not be read by any other program. This is how you can extract the files though.
PowerISO binary for Linux: http://www.poweriso.com/poweriso-1.3.tar.gz
"This is a free utility for linux which can extract, list, and convert image files (including ISO, BIN, DAA, and other formats). Type " poweriso -? " for detailed usage information. File Size: 278KB"
In July 2008, there was an uproar over Foxconn motherboards feeding Linux installs incorrect ACPI information (http://ubuntu-virginia.ubuntuforums.org/showthread.php?t=869249).
Foxconn has gladly corrected their mistake, but make sure it's not happening on your motherboard!
After running the command, just view the 'dsdt.dsl' in any editor you like.
Use mencoder to concatenate (join) multiple video files together.