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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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Don't save commands in bash history (only for current session)
Unsetting HISTFILE avoid getting current session history list saved.

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

Remind yourself to leave in 15 minutes
If you spend most of your time in front of the terminal, leave is a useful reminder. Leave can have absolute form: leave 1555 reminds you to leave at 3:55PM

Block all FaceBook traffic

convert a line to a space

Update twitter with Perl
Requires Net::Twitter. Just replace the double quoted strings with the appropriate info.

list files recursively by size

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Quickly add user accounts to the system and force a password change on first login
This command is a bit Linux specific, as --stdin doesn't exist for passwd on many Unix machines. Further, useradd is high level in most distributions and Unix derivatives except for the Debian family of distros, where adduser would be more appropriate. The last bit, with chage, will force the user to change their password on new login.

Sum file sizes
Even simpler! Use du ... the -s and -c flags summarize and print a grand total of all files recursively. The -b flag prints in byte format. You can use the -h flag instead to print in human readable format.


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