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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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Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

check the status of 'dd' in progress (OS X)
Your platform may not have pv by default. If you are using Homebew on OSX, simply 'brew install pv'.

Determine whether a CPU has 64 bit capability or not

Get your external IP address ( 10 characters long )
Shortest url to a external IP-service, 10 characters.

Lists the size of certain file in every 10 seconds
watch is a command especially designed for doing this job

do a full file listing of every file found with locate

Find the package that installed a command

Shows all packages installed that are recommended by other packages
Shows the packages installed on your system that are recomemnded by other packages. You should remove these packages.

Duplicate installed packages from one machine to the other (RPM-based systems)

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.


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