While Constructs - Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X Configuration Manual

<# if 0 #>
! This is never output because a value of zero is " false."
<# endif #>
<# // Here's an example with elseif and else. #>
<# color := env.getline("What is your favorite color? ") #>
<# if color = "red" #>
! Red is my favorite color, too.
<# elseif color = "pink" #>
! Pink is a lot like red.
<# elseif color = "black" #>
! Black is just a very, very, very dark shade of red.
<# else #>
! Oh. That's nice.
<# endif #>
<# // Here's a nested if example. #>
<# sure := env.getline("Are you sure that " $ color $ " is your favorite color?
") #>
<# if substr(sure, 0, 1) = 'y' || substr(sure, 0, 1) = 'Y' #>
<# if color != "black" && color != "white";
shade := env.getline("Do you prefer dark " $ color $
" or light " $ color $ "? ") #>
<# if shade = "dark" #>
! I like dark colors, too.
<# elseif shade = "light" #>
! I prefer dark colors myself.
<# else #>
! Hmmm, that's neither dark nor light.
<# endif #>
<# else #>
! Oh. That's nice.
<# endif #>
<# else #>
! I didn't think so!
<# endif #>
<# endtmpl #>

While Constructs

While constructs provide a means to repeatedly execute one or more portions of the
macro based on a condition that changes during the execution. A while construct
consists of the following components:
An opening while expression
A group of any number of additional expressions
An endwhile expression to indicate the end of the while structure
The while expression must include a lone environment value command, a local
variable, a literal, or some operation using one or more operators. Each time that
this expression evaluates to nonzero, the associated expression group is executed.
You can place an iteration expression after the while expression. This optional
expression is evaluated after each execution of the while expression group.
You can include if structures within a while structure. You can also include special
control expressions indicated by the break or continue expressions. The break
expression breaks out of the while structure by halting execution of the expression
group and executing the first expression after the endwhile statement. The continue
Chapter 8: Writing CLI Macros
487
Writing Macros