expr will give you a quick way to do basic math from the CLI. Make sure you escape things like * and leave a space between operators and digits. Show Sample Output
url can be like any one of followings:
url="MejbOFk7H6c"
url="http://youtu.be/MejbOFk7H6c"
url="https://youtube.com/watch?feature=player_embedded&v=MejbOFk7H6c#t"
url="//www.youtube.com/v/MejbOFk7H6c?hl=ru_RU&version=3&rel=0"
url="http://www.youtube.com/embed/MejbOFk7H6c?feature=player_embedded"
If url mismatching, whole url will be returned.
Show Sample Output
Checks whether IPv6 is enabled system-wide by reading from procfs. Show Sample Output
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