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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

make 100 directories with leading zero, 001...100, using bash3.X

list the top 15 folders by decreasing size in MB
list the top 15 folders by decreasing size in MB

Update all packages installed via homebrew
As of March 7, 2012: $ brew update - downloads upgraded formulas $ brew upgrade [FORMULA...] - upgrades the specified formulas $ brew outdated - lists outdated installations Note updating all packages may take an excruciatingly long time. You might consider a discriminating approach: run `brew outdated` and select specific packages needing an upgrade. For more information see homebrew's git repository: https://github.com/mxcl/homebrew

Hide or show Desktop Icons on MacOS
Hides all Files and Folders on the MacOS Desktop. To show files and folders, type "true" instead of "false". "Finder" at the end is case sensitive, "finder" doesn’t work

Stripping ^M at end of each line for files

Download all files from podcast RSS feed
Neither of the others worked for me. This does.

Delete all files older than X in given path
This will find all files under the path "." which are older than 10 days, and delete them. If you wish to use the "rm" command instead, replace "-delete" with "-exec rm [options] {} \;"

print character classes
Today I needed a way to print various character classes to use as input for a program I was writing. Also a nice way to visualize character classes.

Remove security limitations from PDF documents using ghostscript (for Windows)
#4345 also works under windows


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