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Filter the output of a file continously using tail and grep
The OPs solution will work, however on some systems (bsd), grep will not filter the data, unless the --line-buffered option is enabled.

Backup a local drive into a file on the remote host via ssh

Analyse writing style of writing style of a document
Style analyses the surface characteristics of the writing style of a document. It prints various readability grades, length of words, sentences and paragraphs. It can further locate sentences with certain characteristics. If no files are given, the document is read from standard input. style is part of "diction" package

Count opening and closing braces in a string.
This function counts the opening and closing braces in a string. This is useful if you have eg long boolean expressions with many braces and you simply want to check if you didn't forget to close one.

Copy ssh keys to user@host to enable password-less ssh logins.
Alternative for machines without ssh-copy-id

List the size (in human readable form) of all sub folders from the current location

Install pip with Proxy
Installs pip packages defining a proxy

ls only directories
Like normal ls, but only lists directories. Can be used with -l to get more details (ls -lad */)

A one-line web server in Ruby
Here's how to serve a directory in one line of Ruby. Handy for sharing files at a conference, for example.

Convert (almost) any video file into webm format for online html5 streaming

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