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See a full list of compiler defined symbols
From http://lists.debian.org/debian-devel/2001/01/msg00971.html .

Monitor all DNS queries made by Firefox Mac OS X version

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

shut of the screen ( Fool proof )
Use the command to create a script and bind it to a key using keyboard shortcut. eg: Script locks the screen in a loop until the command is executed again.At first it

Ping all hosts on 192.168.1.0/24

Find the package that installed a command

Check if a web page has changed last time checked.
Checks if a web page has changed. Put it into cron to check periodically. Change http://www.page.de/test.html and mail@mail.de for your needs.

Comparison between the execution output of the last and penultimate command
Useful for checking if there are differences between last and penultimate command.

My PS1
My PS1

Generate binary sequence data


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