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Create an eicar.com test virus
Test whether real-time virus detection is working by running this command and checking for eicar.com in /tmp. Requires real-time scanning to be enabled and active on the /tmp directory. If scanning is active, the file should be quarantined/deleted (depending on your settings) moments after running this command. If not, the (harmless) test file should remain in your /tmp directory.

Rename .JPG to .jpg recursively
This command is useful for renaming a clipart, pic gallery or your photo collection. It will only change the big caps to small ones (on the extension).

Compare prices in euro of the HTC Desire on all the european websites of Expansys.
You think Expansys in all these countries will sell the HTC Desire for the same price? Well, you'll be surprised. Most of them will be sold at 499.99 EUR but the cheapest can be found in Germany and the most expensive, in Belgium.

Lists architecture of installed RPMs
Lists all installed RPM packages with name and architecture, which is useful to check for compability packages (+ required i386 packages) on a 64bit system.

Update your journal
prerequisite: $ mkdir ~/journal

list files recursively by size

STAT Function showing ALL info, stat options, and descriptions
This shows every bit of information that stat can get for any file, dir, fifo, etc. It's great because it also shows the format and explains it for each format option. If you just want stat help, create this handy alias 'stath' to display all format options with explanations. $ alias stath="stat --h|sed '/Th/,/NO/!d;/%/!d'" To display on 2 lines: $ ( F=/etc/screenrc N=c IFS=$'\n'; for L in $(sed 's/%Z./%Z\n/'

last.fm rss parser
you can just use one awk script to parse the rss feed. No need to pipe so many awk's and sed's. Its ugly and inefficient.

easily find megabyte eating files or directories
sorts the files by integer megabytes, which should be enough to (interactively) find the space wasters. Now you can $ dush for the above output, $ dush -n 3 for only the 3 biggest files and so on. It's always a good idea to have this line in your .profile or .bashrc

Make window transparent (50% opacity) in Gnome shell
Click window to change its opacity. Source: https://unix.stackexchange.com/a/494289


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