Lets you filter a list by searching for a matching string or regex within the pretty-printed contents.
Follows a file as it is written, handy e.g.
Follows a file as it is written, handy e.g. for log files. Returns an iterator which you can then print to standard out or use for other things.
Used to split a stream down two or three different path, e.g.
Used to split a stream down two or three different path, e.g. to print out intermediate values in the middle of a longer pipeline