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case(3tcl) Tcl Built-In Commands case(3tcl) 





NAME


case - Evaluate one of several scripts, depending on a given
  value






SYNOPSIS


case string ?in? patList body
    ?patList body ...?


case string ?in? {patList body
    ?patList body ...?}










DESCRIPTION


Note: the case command is obsolete and is
    supported only for backward compatibility. At some point in the
    future it may be removed entirely. You should use the
    switch command instead.


The case command matches string against each of the
    patList arguments in order. Each patList argument is a list of
    one or more patterns. If any of these patterns matches string then
    case evaluates the following body argument by passing it
    recursively to the Tcl interpreter and returns the result of that
    evaluation. Each patList argument consists of a single pattern or
    list of patterns. Each pattern may contain any of the wild-cards described
    under string match. If a patList argument is default,
    the corresponding body will be evaluated if no patList matches
    string. If no patList argument matches string and no
    default is given, then the case command returns an empty string.


Two syntaxes are provided for the patList and body
    arguments. The first uses a separate argument for each of the patterns and
    commands; this form is convenient if substitutions are desired on some of
    the patterns or commands. The second form places all of the patterns and
    commands together into a single argument; the argument must have proper list
    structure, with the elements of the list being the patterns and commands.
    The second form makes it easy to construct multi-line case commands, since
    the braces around the whole list make it unnecessary to include a backslash
    at the end of each line. Since the patList arguments are in braces in
    the second form, no command or variable substitutions are performed on them;
    this makes the behavior of the second form different than the first form in
    some cases.








SEE ALSO


switch(3tcl)








KEYWORDS


case, match, regular expression







  

    7.0
    Tcl