Node:Notation (Tcl), Next:Commands to do with variables, Previous:Commands, Up:Commands
A quick word about the notation used to describe Tcl commands.
In general, a description of a command is the name of the command
followed by its arguments separated by spaces.
An example is:
set varName ?value?
which is a description of the Tcl set command, which takes a variable name varName and an optional argument, a value.
Optional arguments are enclosed in question mark, ?, pairs, as in the example.
A series of three dots ... represents repeated arguments. An example is
a description of the unset command:
unset varName ?varName varName ...?
which shows that the unset command has at least one compulsory argument
varName but has any number of subsequent optional arguments.