01-12-2010
Hi,
I don't think I can add much to this observation, other than it is an example of how absurd the cmd shell is! I have wrestled with this from time to time. It should be such an easy thing to just ask for the current time, right?
The env variables DATE and TIME are set at .cmd-file execution start. But not entirely! If You have a script that runs over several minutes it *may* change! Or if You make a "call" to another script (that does echo %DATE% %TIME%), but they may simply
inherit the callers values, I don't recall correctly right now, but please try
If You use TIME You get an interactive command, but it shows You the "correct" time. If You use TIME /T it will only display HH:MM !
If You use TIME < NUL (instead of giving it the output of VER which is just garbage for the TIME command, that's why it works) it will give You an ugly prompt, so You will have to filter it.
So bloody stupid!
And don't get me started on such a simple thing as sleep... arrrrgh!
/Grrrr
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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)