'''info vars''' ''?pattern?''

If ''pattern'' isn't specified, returns a list of all the names of currently-visible variables. This includes locals and currently-visible globals. If ''pattern'' is specified, only those names matching ''pattern'' are returned. The matching of ''pattern'' is determined using the same rules as for [string match]. ''Pattern'' can be a qualified name like Foo::option*. That is, it may specify a particular namespace using a sequence of namespace names separated by ::s, and may have pattern matching special characters at the end to specify a set of variables in that namespace. If ''pattern'' is a qualified name, the resulting list of variable names has each matching namespace variable qualified with the name of its namespace.

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Question: in what cases do these two info commands differ?

  set a 1

  set b [info exists a]

and

  set c [info vars a]

The doc for [info exists] indicates
that the variable exists and has a value in either the current or global
space.

Certainly, one potential problem is if the variable has any pattern characters
in it.

Are there other differences between the two?

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See also:

   * [info]
   * [vargrep]

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[Category Command] - [Tcl syntax help]