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Count lines in a file with grep
Returns the number of lines in a file, emulates "wc -l" behavior with grep.

Set all CPU cores' CPU frequency scaling governor to maximum performance

Function to change prompt
Bash function to change your default prompt to something simpler and restore it to normal afterwards.

Rsync files with spaces
Using the double dash before the source and target makes the command work fine with weird filenames.

Find last reboot time
Displays time of last system boot

Find all files larger than 500M and less than 1GB

zsh suffix to inform you about long command ending
make, find and a lot of other programs can take a lot of time. And can do not. Supppose you write a long, complicated command and wonder if it will be done in 3 seconds or 20 minutes. Just add "R" (without quotes) suffix to it and you can do other things: zsh will inform you when you can see the results. You can replace zenity with other X Window dialogs program.

url shortner using google's shortner api
First get a api key for google url shortner from here https://developers.google.com/url-shortener/ Then replace the API_KEY in the command

List bash functions defined in .bash_profile or .bashrc
http://stackoverflow.com/questions/2625783/listing-defined-functions-in-bash#2627461

The NMAP command you can use scan for the Conficker virus on your LAN
This was posted on reddit. replace 192.168.0.1-256 with the IP's you want to check.


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