case

case(n)                       Tcl Built-In Commands                      case(n)



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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 ...?}
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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       Note: the case command is obsolete and is supported only for backward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(n)


KEYWORDS
       case, match, regular expression



Tcl                                    7.0                               case(n)