Frequently used tools

histogrambead	INTERNAL	A function that can be used to calculate whether quantities are between fixed upper and lower bounds.
kernelfunctions	INTERNAL	Functions that are used to construct histograms
pdbreader	INTERNAL	PLUMED can use the PDB format in several places
switchingfunction	INTERNAL	Functions that measure whether values are less than a certain quantity.

Regular Expressions		POSIX regular expressions can be used to select multiple actions when using ARG (i.e. PRINT).
Files		Dealing with Input/Output