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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