Tool Command language -Lecture 4(Use of Switch)

The use of Switch replaces multiple if-else. The syntax is as 
  
switch string pattern 1 body 1 pattern 2 body 2 ... pattern n body n
                                    or
switch string {pattern 1 body 1 pattern 2 body 2... pattern n body n}
example :

set x one
switch $x "ONE" "puts ONE=1" "two" "puts 2"
           or           
set c hate  
switch  $c {
"love" {
puts "i hate u"
 }
"hate" {
 puts "i know"
        }
     }