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Get max number of arguments
Get max number of arguments that can be accepted by the exec() system call.

Changing the terminal title to the last shell command
You can set the previous bash command as the terminal title by this command. Explanation: -trap assigns a command to execute at a given bash signal. -in the $BASH_COMMAND you find the last command -you can set the terminal title with the escape sequence: \e]0;this is the title\007 -to let the echo care about the backslashes give the -e to it Since trap is a built in bash command you find more informatin in 'man bash'for more Source: http://www.davidpashley.com/articles/xterm-titles-with-bash.html

Get your external IP address

Given $PID, print all child processes on stdout
Simpler.

Compute the average number of KB per file for each dir
Shorter version using --tag

Get a funny one-liner from www.onelinerz.net
Put this command in .bashrc and every time you open a new terminal a random quote will be downloaded and printed from onelinerz.net. By altering the URL in the w3m statement you can change the output: 1 to 10 lines - http://www.onelinerz.net/random-one-liners/(number)/ 20 newest lines - http://www.onelinerz.net/latest-one-liners/ Top 10 lines - http://www.onelinerz.net/top-100-funny-one-liners/ Top 10 lines are updated daily.

nmap port scanning
TCP Connect scanning for localhost and network 192.168.0.0/24

Find the package that installed a command

View internet connection activity in a browser
In addition to generating the current connections, it also opens then in your default browser on gnome.

Detach a process from the current shell
ignore HUP interruptions


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