http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/history.htm

    :   '''history''' ?''option''? ?''arg arg ...''?

Supported subcommands are:

    :   '''[history add]''' ''command'' ?'''exec'''?
    :   '''[history change]''' ''newValue'' ?''event''?
    :   '''[history clear]'''
    :   '''[history event]''' ?''event''?
    :   '''[history info]''' ?''count''?
    :   '''[history keep]''' ?''count''?
    :   '''[history nextid]'''
    :   '''[history redo]''' ?''event''?

Without any ''option'', '''history''' is equivalent to '''[history info]'''.

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