1. # Standard simple if

  2. if {some condition} {

  3.     # Note that the open-brace for the body is on the same line

  4.     # as the if-command and condition.


  6.     some conditionally executed script...

  7. }


  9. # Standard simple if with else clause

  10. if {some condition} {

  11.     some conditionally executed script.

  12. } else {

  13.     some script to execute if the condition is not satisfied.

  14. }


  16. # Standard multi-test if

  17. if {first condition} {

  18.     thing to do if the first condition succeeds

  19. } elseif {second condition} {

  20.     thing to do if the first fails, but the second condition succeeds

  21. } else {

  22.     what to do if none of the conditions match - this one is optional,

  23.     but typically good practice to anticipate unexpected responses

  24. }


  26. # Handling complex (i.e. long) conditions

  27. if {

  28.     this condition stretches over

  29.     multiple lines

  30. } then {

  31.     thing to do if the condition succeeds

  32. }