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
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.
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