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- Usage: WHILE <boolean> { <cmd> }
- This will execute the given cmd while the given boolean returns
- true. The boolean has the same format as for the IF command, except
- that it is re-evaluated at each loop interation. The same is true
- for cmd. It is re-evaluated at each loop interation.
- Example (in script format):
- alias repeat
- {
- @ rep = 0;
- while (rep < [$0])
- {
- $1-
- @ rep = rep + 1
- }
- assign -rep
- }
-
- This can be used as follows:
- /repeat 10 /msg bigcheese This repeats 10 times
- The repeat alias breaks down into three parts.
-
- @ rep = 0
- while (rep < [$0]) {$1-;@ rep = rep + 1}
- assign -rep
-
- The first is to initialize rep to 0 and the last part is to remove
- rep when done. The first is just like ASSIGN rep 0
- The WHILE portion is described below:
- The boolean for the while loop is (rep < [$0]).
- This is what is then used at each loop interation. At the
- first iteration this will be ( 0<10 ), at the next ( 1<10 ), and so on.
- The cmd part of this looks like {$1-;@ rep = rep + 1}
- When the alias is first parsed, the stuff inside {..} is not expanded but
- is simply executed at each loop interation. It expands to
- 'msg bigcheese This repeats 10 times.;@ rep = rep + 1'
- It sends the MSG to BigCheese and then it increments rep by 1.
- (See HELP @ for more information about this assignment)
-
- The command part while is exactly like the syntax in IF
- and FOREACH.
-
- See Also:
- IF
- FOREACH
- @
- expressions
-