Re^3: Reading progress of "copy" executed asynchronously

I was not aware Windows reports incorrect filesizes. Then you have to rely on copy's reporting. Use this pipe-open form instead:

use strict;
use warnings;
my $cmd = 'copy.exe 'from', 'to', '/z' |';
open(EXE, $cmd) || die "$!";
while(<EXE>){
        print "read from program output: ".$_."\n";
}
print "done.\n";
close(EXE);
[download]

Or use IPC::Run or any other IPC::* module mentioned here or there.

Comment on Re^3: Reading progress of "copy" executed asynchronously Download Code

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Re^4: Reading progress of "copy" executed asynchronously by neWerminder (Novice) on Aug 10, 2018 at 08:26 UTC
Hello As for code it wont work. i tried earlier on and it gives output only when its done but i need to monitor progress As for IPC ill check	[reply]
Re^5: Reading progress of "copy" executed asynchronously by vr (Curate) on Aug 10, 2018 at 12:48 UTC
This works for me on Windows: use strict; use warnings; use feature 'say'; use POSIX ":sys_wait_h"; use Capture::Tiny ':all'; my $cmd = 'cmd /c copy a1GBfile a1GBfile_copy /z'; my $out = IO::File-> new_tmpfile; capture_stdout { my $pid = system( 1, $cmd ); while () { last if waitpid( $pid, WNOHANG ); undef local $/; seek $out, 0, 0; my $s = <$out>; next unless $s and $s =~ m/.\D(\d+)%/s; say STDERR "progress so far: $1 percent"; sleep 1; } } stdout => $out; close $out; __END__ progress so far: 0 percent progress so far: 60 percent progress so far: 70 percent progress so far: 80 percent progress so far: 89 percent progress so far: 99 percent [download] I'd prefer to use filehandle opened on Perl scalar, but `Capture::Tiny` isn't happy about the idea. + You can `tee_stdout` instead of `capture_stdout`, to see "normal" output in console, and replace `say STDERR ...` line with real logic of what you trying to do. Or, to see if something* is still happening, just check `-s $out` for change instead of slurping.	[reply] [d/l] [select]
Re^5: Reading progress of "copy" executed asynchronously by bliako (Abbot) on Aug 10, 2018 at 09:52 UTC
You want to say that from `cmd.exe` `copy 'from' 'to' /z` reports on progress as it does the copy but when run via Perl's pipe-open it does not update the output until it finishes? In some OSs I find my luck runnning out faster than in others ...	[reply] [d/l] [select]