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1. Unzip all zip files in the directory tree

   If you have a directory containing a lot of zip files with data.

   You might find the following command useful. It unzips all zip files under the current directory in their current location.

   find . -name '*.zip' -exec sh -c 'unzip -o -d "${0%/*}" "$0"' '{}' ';'
   

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2. Rename all files in a directory to lower case

   I had a directory full of CEL files, which I wanted to bring to lower case for consistency with other CEL files I had within that project.

   To rename all files in a specific directory on a Debian based system you can use:

   rename 'y/A-Z/a-z/' *
   

   Or if you ...

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3. Convert avi to wmv

   If you ever want to embed a video file in a PowerPoint presentation, the following command can be useful. It allows you to convert a video file to wmv.

   The wmv format is better supported for playback within PowerPoint (at least on Windows systems). mencoder luckily makes this very easy ...

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4. Save the first N lines of a gzipped file to a new file (without unzipping)

   I needed to write an import function in R for a certain data file. There was no description of the file format available, but I did have access to the files themselves. These were gzipped text files over 10G.

   Rather than unzipping them first and then use head:

   head -1000 ...

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5. Recursively copy all jpeg files to a single directory

   I have backups from multiple machines on one external hard drive. No I wanted to combine all pictures from those machines into one big folder, so I could easily upload them into owncloud and have one place with all our images.

   This job turned out to be simple using a ...

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