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Remove all zero size files from current directory (not recursive)
works only in zsh

Remove duplicate rows of an un-sorted file based on a single column
$F[0] filters using first word. $F[1] - 2nd, and so on.

Remove security limitations from PDF documents using QPDF
Remove security restrictions from PDF documents using this very simple command on Linux and OSX. You need QPDF installed (http://qpdf.sourceforge.net/) for this to work.

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"

Rename files in batch

Show bash's function definitions you defined in .bash_profile or .bashrc
If you omit the function name, the command will display all definitions

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"

Download files linked in a RSS feed
The difference between the original version provided and this one is that this one works rather than outputting a wget error

Windows telnet
Check if TCP port is reacheable

Check the age of the filesystem
Very useful set of commands to know when your file system was created.


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