case man page on OpenDarwin

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


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

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

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

       Note:  the  case command is obsolete and is supported only for backward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	 argu‐
       ments  are in braces in the second form, no command or variable substi‐
       tutions are performed on them;  this makes the behavior of  the	second
       form different than the first form in some cases.


       case, match, regular expression

Tcl				      7.0			       case(n)

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