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OpenDarwin 7.2.1 - man page for if (opendarwin section n)

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

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NAME
       if - Execute scripts conditionally

SYNOPSIS
       if expr1 ?then? body1 elseif expr2 ?then? body2 elseif ... ?else? ?bodyN?
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DESCRIPTION
       The  if	command evaluates expr1 as an expression (in the same way that expr evaluates its
       argument).  The value of the expression must be a boolean (a numeric  value,  where  0  is
       false and anything is true, or a string value such as true or yes for true and false or no
       for false); if it is true then body1 is executed by passing it  to  the	Tcl  interpreter.
       Otherwise  expr2  is  evaluated as an expression and if it is true then body2 is executed,
       and so on.  If none of the expressions evaluates to true then bodyN is executed.  The then
       and else arguments are optional ``noise words'' to make the command easier to read.  There
       may be any number of elseif clauses, including zero.  BodyN may also be omitted as long as
       else  is  omitted too.  The return value from the command is the result of the body script
       that was executed, or an empty string if none of the expressions was  non-zero  and  there
       was no bodyN.

SEE ALSO
       expr(n), for(n), foreach(n)

KEYWORDS
       boolean, conditional, else, false, if, true

Tcl											    if(n)
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