11-10-2011
Thank you for your time but if you would read my last post carefully and not skim over it... you'd see that I said "except for loop" which implies that I already know how to do it with a for loop but I was asking you for some other method "if it exits".
Second thing, I KNOW that it can be done by the expr command but I asked you that WHY I am getting away with using a command like $((...mathematical expression...)) if I am working in the bourne shell WHICH implies that I ALREADY understood that expr can be used.
I do understand if "...am i able to..." couldn't really pass my message along clearly but I think "....except for loop...." was mentioned pretty neatly.
Again, thank you for your time and effort but kindly re read the post before tagging my genuine problem as "homework".
Last edited by navienavnav; 11-10-2011 at 11:59 AM..
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while(n) Tcl Built-In Commands while(n)
__________________________________________________________________________________________________________________________________________________
NAME
while - Execute script repeatedly as long as a condition is met
SYNOPSIS
while test body
_________________________________________________________________
DESCRIPTION
The while command evaluates test as an expression (in the same way that expr evaluates its argument). The value of the expression must a
proper boolean value; if it is a true value then body is executed by passing it to the Tcl interpreter. Once body has been executed then
test is evaluated again, and the process repeats until eventually test evaluates to a false boolean value. Continue commands may be exe-
cuted inside body to terminate the current iteration of the loop, and break commands may be executed inside body to cause immediate termi-
nation of the while command. The while command always returns an empty string.
Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the while command starts execut-
ing, which means that variable changes made by the loop body will not be considered in the expression. This is likely to result in an
infinite loop. If test is enclosed in braces, variable substitutions are delayed until the expression is evaluated (before each loop iter-
ation), so changes in the variables will be visible. For an example, try the following script with and without the braces around $x<10:
set x 0
while {$x<10} {
puts "x is $x"
incr x
}
SEE ALSO
break(n), continue(n), for(n), foreach(n)
KEYWORDS
boolean value, loop, test, while
Tcl while(n)