Easiest way to get the external IP address.

http://ifconfig.me is a web site which shows your public iP address. If you want use your own code, you can use PHP code such as: function getip() { return "".$_SERVER["REMOTE_ADDR"]; } echo getip(); ?> Then, you'll get your IP by 'curl yourfile.php'. Show Sample Output

Download all pdf files off of a website using wget. You can change the file type to download, changing the extension, as an example you can change pdf for txt in command. Show Sample Output

1. No for-loop, but xargs. 2. Append "--" in git-reset HEAD command to deal with filenames contained leading hyphen/minus sign (-). 3. Add "--porcelain" option in git-status command for easy-to-parse format when scripting. 4. Add "--no-run-if-empty" option in xargs command to prevent you run it twice and accidentally reset all staged changes. 5. Use zero byte (NUL character) as line terminator instead of newline (\n) to make it more robust to deal with filename with whitespaces. pipe#1: git-status. pipe#2: Use "grep" to filter out "non-added" files. pipe#3: use "sed" to Trim out the leading three characters, reserve the filename. pipe#4: xargs + git-reset... p.s. The "HEAD" in git-reset can be omitted . And, maybe, the third part of this shell pipe (sed) has potential to be enhanced.

This shell calculator uses POSIX features only and is therefore portable. By default the number of significant figures is limited to 8 with trailing zeros stripped, resembling the display of a basic pocket calculator. You might want to increase this to 12 to emulate a scientific calculator. Show Sample Output