1case(n) Tcl Built-In Commands case(n)
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8 case - Evaluate one of several scripts, depending on a given value
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11 case string ?in? patList body ?patList body ...?
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13 case string ?in? {patList body ?patList body ...?}
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18 Note: the case command is obsolete and is supported only for backward
19 compatibility. At some point in the future it may be removed entirely.
20 You should use the switch command instead.
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22 The case command matches string against each of the patList arguments
23 in order. Each patList argument is a list of one or more patterns. If
24 any of these patterns matches string then case evaluates the following
25 body argument by passing it recursively to the Tcl interpreter and
26 returns the result of that evaluation. Each patList argument consists
27 of a single pattern or list of patterns. Each pattern may contain any
28 of the wild-cards described under string match. If a patList argument
29 is default, the corresponding body will be evaluated if no patList
30 matches string. If no patList argument matches string and no default
31 is given, then the case command returns an empty string.
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33 Two syntaxes are provided for the patList and body arguments. The
34 first uses a separate argument for each of the patterns and commands;
35 this form is convenient if substitutions are desired on some of the
36 patterns or commands. The second form places all of the patterns and
37 commands together into a single argument; the argument must have proper
38 list structure, with the elements of the list being the patterns and
39 commands. The second form makes it easy to construct multi-line case
40 commands, since the braces around the whole list make it unnecessary to
41 include a backslash at the end of each line. Since the patList argu‐
42 ments are in braces in the second form, no command or variable substi‐
43 tutions are performed on them; this makes the behavior of the second
44 form different than the first form in some cases.
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48 switch(n)
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52 case, match, regular expression
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56Tcl 7.0 case(n)