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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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copy from host1 to host2, through your host
Good if only you have access to host1 and host2, but they have no access to your host (so ncat won't work) and they have no direct access to each other.

Summarize size of all files of given type in all subdirectories (in bytes)
This deals nicely with filenames containing special characters and can deal with more files than can fit on a commandline. It also avoids spawning du.

Route outbound SMTP connections through a addtional IP address rather than your primary

Which files/dirs waste my disk space
I added -S to du so that you don't include /foo/bar/baz.iso in /foo, and change sorts -n to -h so that it can properly sort the human readable sizes.

List bash functions defined in .bash_profile or .bashrc

Show a Command's Short Description
The whatis command displays a short description for the command you list on the command line. It is useful to quickly learn what a command does

Check the current price of Bitcoin in USD

list block devices
Shows all block devices in a tree with descruptions of what they are.

Set OS X X11 to use installed Mathematica fonts

check open ports without netstat or lsof


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