|
|||||
|
|
|||||
| control structure | do when, do unless | ||||
| Related Syntax | Related Concepts | ||||
Syntax
do (when|unless) condition?
local declaration*
action*
(else condition
local-declaration*
action*)*
(else
local-declaration*
action*)?
done
You can use do when and do unless to make a group of actions conditional:
do when count > 5
output "more than 5"
done
You can use else to specify actions to be taken if the condition is not met:
do when count > 5
output "more than 5"
else
output "less than 6"
done
You can use one or more else when statements to provide multiple conditional alternatives:
do when count > 5
output "more than 5"
else when count = 5
output "exactly 5"
else
output "less than 5"
done
In all these circumstances you can use do unless in place of do when to reverse the test. do unless is equivalent to do when not, but in many cases do unless will be more readable.
|
Related Syntax do select do sgml-parse do skip do scan do xml-parse when, unless |
Related Concepts Conditional constructs |
| ---- |
