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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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Download free e-books
Mask the user agent as firefox, recursively download 2 levels deep from a span host with a maximum of 1 redirection, use random wait time and dump all pdf files to myBooksFolder without creating any other directories. Host will have no way of knowing that this is a grabber script.

Find files and calculate size of result in shell
Using find's internal stat to get the file size is about 50 times faster than using -exec stat.

Check if variable is a number

write by vim need root privilege

Find the biggest files
Also: * find . -type f -exec ls -s {} \; | sort -n -r | head -5 * find . -type f -exec ls -l {} \; | awk '{print $5 "\t" $9}' | sort -n -r | head -5

Add the time to BASH prompt
Adds the time in 12hr AM/PM format to the beginning of a prompt. Change \@ to \t for 24-hour time or \T for 12hr without AM/PM. To keep the time the next time you open a terminal, edit ~/.bashrc and stick the command at the bottom.

Search google.com on your terminal
I found this command on a different site and thought you guy might enjoy it. Just change "YOURSEARCH" to what ever you want to search. Example, "Linux Commands"

Find out my Linux distribution name and version

Calculate pi to an arbitrary number of decimal places

Ping all hosts on 192.168.1.0/24


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