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Shell Programming and Scripting
Setting Variables WITHIN For Loop in DOS Command Shell
Post 302497956 by ProGrammar on Friday 18th of February 2011 01:27:34 PM
02-18-2011
Setting Variables WITHIN For Loop in DOS Command Shell
I'm wondering if any of you could lend an assist with a small problem.
First, I'm under the impression I need to use Delayed Environment Variable Expansion (DEVE), based on other things I've read across the web.
Summary: trying to use command shell (cmd.exe) in XP sp3 (if that's relevant) to write a small script that will rename files.
So I require a for-loop that stores a filename for each iteration (simple enough, just use the %A in:
SETLOCAL ENABLEDELAYEDEXPANSION
for /F "usebackq" in (`dir /b C:\directory\*`) do (
set origname=%A
echo %origname%
echo !origname!
)
which results in the literal strings "%origname%" and "!origname!" being printed to the screen, no variable expansion is taking place except in the line where I attempt to set the variable origname...the %A expands to the iteration of the `dir /b C:\directory\*` output which is being processed at the time.
What am I doing wrong?! From what I can tell, by other people's posts online, it seems like maybe DEVE isn't working for me, if !origname! won't expand to the value of %A after it's set in the first command of the command set for the loop operation.
I can't just use %A either, because I require string manipulation of the value %A and command shell is lame and can only perform string manipulaton of variables with the convention %var%, (e.g. %var:~5,1% which would effectively extract the 6th char from the value of %var%.
I intend to perform checks of the 8th character in the %origname% variable and compare it against if test conditions to determine how to handle the file from there.
Make sense?!
I hope somebody here is familiar with DOS and can help me troubleshoot this. It's frustrating and I feel like I have found a cause in proving I'm smarter than esoteric DOS programming conventions.
First, I'm under the impression I need to use Delayed Environment Variable Expansion (DEVE), based on other things I've read across the web.
Summary: trying to use command shell (cmd.exe) in XP sp3 (if that's relevant) to write a small script that will rename files.
So I require a for-loop that stores a filename for each iteration (simple enough, just use the %A in:
SETLOCAL ENABLEDELAYEDEXPANSION
for /F "usebackq" in (`dir /b C:\directory\*`) do (
set origname=%A
echo %origname%
echo !origname!
)
which results in the literal strings "%origname%" and "!origname!" being printed to the screen, no variable expansion is taking place except in the line where I attempt to set the variable origname...the %A expands to the iteration of the `dir /b C:\directory\*` output which is being processed at the time.
What am I doing wrong?! From what I can tell, by other people's posts online, it seems like maybe DEVE isn't working for me, if !origname! won't expand to the value of %A after it's set in the first command of the command set for the loop operation.
I can't just use %A either, because I require string manipulation of the value %A and command shell is lame and can only perform string manipulaton of variables with the convention %var%, (e.g. %var:~5,1% which would effectively extract the 6th char from the value of %var%.
I intend to perform checks of the 8th character in the %origname% variable and compare it against if test conditions to determine how to handle the file from there.
Make sense?!
I hope somebody here is familiar with DOS and can help me troubleshoot this. It's frustrating and I feel like I have found a cause in proving I'm smarter than esoteric DOS programming conventions.
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POE::Loop::Tk(3pm) User Contributed Perl Documentation POE::Loop::Tk(3pm) sub skip_tests { return "Tk needs a DISPLAY (set one today, okay?)" unless ( (defined $ENV{DISPLAY} and length $ENV{DISPLAY}) or $^O eq "MSWin32" ); my $test_name = shift; if ($test_name eq "k_signals_rerun" and $^O eq "MSWin32") { return "This test crashes Perl when run with Tk on $^O"; } return "Tk tests require the Tk module" if do { eval "use Tk"; $@ }; my $m = eval { Tk::MainWindow->new() }; if ($@) { my $why = $@; $why =~ s/ at .*//; return "Tk couldn't be initialized: $why"; } return; } NAME
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See POE::Loop. DESCRIPTION
POE::Loop::Tk implements the interface documented in POE::Loop. Therefore it has no documentation of its own. Please see POE::Loop for more details. POE::Loop::Tk is one of two versions of the Tk event loop bridge. The other, POE::Loop::TkActiveState accommodates behavior differences in ActiveState's build of Tk. Both versions share common code in POE::Loop::TkCommon. POE::Loop::Tk dynamically selects the appropriate bridge code based on the runtime environment. SEE ALSO
POE, POE::Loop, Tk, POE::Loop::TkCommon, POE::Loop::PerlSignals. AUTHORS &; LICENSING Please see POE for more information about authors, contributors, and POE's licensing. perl v5.10.1 2010-04-11 POE::Loop::Tk(3pm)