file extension name
Returns all of the characters in name after and including the last dot in the last element of name. If there is no dot in the last element of name then returns the empty string.
AMG: http://www.fileinfo.net/ can be used to make sense of many common and uncommon file extensions.
Its entry for .tcl [L1 ] is rather curious:
Script written in the Tool Command Language (pronounced "tickle"), a simple textual language used for sending commands to text editors, debuggers, and shells
So... how does Tcl send commands to text editors, debuggers, and shells?
See also: