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Manual for if - man n if

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if(3,n)(n)                        Tcl Built-In Commands                       if(3,n)(n)

       if(3,n) - Execute scripts conditionally

       if(3,n)  expr1  ?then?  body1  elseif  expr2  ?then? body2 elseif ... ?else?

       The if(3,n) command evaluates expr1 as an expression (in(1,8) the same  way  that
       expr(1,3,n)  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(3,n)  value  such as true or yes for true and false or no for false);
       if(3,n) it is true then body1 is executed by passing it to  the  Tcl  inter-
       preter.   Otherwise  expr2  is  evaluated as an expression and if(3,n) 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 com-
       mand  is  the  result of the body script that was executed, or an empty
       string(3,n) if(3,n) none of the expressions was non-zero and there was no  bodyN.

       expr(1,3,n)(n), for(n), foreach(n)

       boolean, conditional, else, false, if(3,n), true

Tcl                                                                      if(3,n)(n)

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