case

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       Note: the case command is obsolete and is supported only for backward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



Tcl                                   7.0                           case(3tcl)