opendarwin man page for if

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)