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#!/usr/local/bin/perl
use strict;
use Fcntl;
# copy-if-different.pl
# Copy to the destination if the source is not the same as it.
my @filelist;
foreach my $arg (@ARGV) {
$arg =~ s|\\|/|g; # compensate for bug/feature in cygwin glob...
foreach (glob $arg)
{
push @filelist, $_;
}
}
my $fnum = @filelist;
if ($fnum <= 1)
{
die "Need at least two filenames";
}
my $dest = pop @filelist;
if ($fnum > 2 && ! -d $dest)
{
die "Destination must be a directory";
}
foreach (@filelist)
{
my $dfile;
if (-d $dest)
{
$dfile = $_;
$dfile =~ s|^.*[/\\]([^/\\]*)$|$1|;
$dfile = "$dest/$dfile";
}
else
{
$dfile = $dest;
}
my $buf;
if (-f $dfile)
{
sysopen(IN, $_, O_RDONLY|O_BINARY) || die "Can't Open $_";
sysopen(OUT, $dfile, O_RDONLY|O_BINARY)
|| die "Can't Open $dfile";
while (sysread IN, $buf, 10240)
{
my $b2;
goto copy if !sysread(OUT, $b2, 10240) || $buf ne $b2;
}
goto copy if sysread(OUT, $buf, 1);
close(IN);
close(OUT);
print "NOT copying: $_ to $dfile\n";
next;
}
copy:
sysopen(IN, $_, O_RDONLY|O_BINARY) || die "Can't Open $_";
sysopen(OUT, $dfile, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY)
|| die "Can't Open $dfile";
while (sysread IN, $buf, 10240)
{
syswrite(OUT, $buf, length($buf));
}
close(IN);
close(OUT);
print "Copying: $_ to $dfile\n";
}
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