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Replace all backward slashes with forward slashes
Use -i to edit file directly: sed -i 's|\\|\/|g' file

tar a directory and send it to netcat
tar's directory and sends to netcat listening on port 10000 On the client end: netcat [server ip] 10000 | tar xfvz - This will send it over the network and extract it on the clients machine.

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.

Quickly generate an MD5 hash for a text string using OpenSSL
Here Strings / A variant of here documents, the format is:

Transforms a file to all uppercase.
Transforms a file to all uppercase.

move a lot of files over ssh
copy files to a ssh server with gzip compression

backup system over ssh, exlucde common dirs

Normalize volume in your mp3 library
This normalizes volume in your mp3 library, but uses mp3gain's "album" mode. This applies a gain change to all files from each directory (which are presumed to be from the same album) - so their volume relative to one another is changed, while the average album volume is normalized. This is done because if one track from an album is quieter or louder than the others, it was probably meant to be that way.

Debug how files are being accessed by a process
Instead of looking through `lsof` results, use inotifywait!

Verbosely delete files matching specific name pattern, older than 15 days.


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