Linux support

The default result of the sum command under linux is different than
Solaris an HP-UX. To compensate, I did this:

diff -c -r1.3 Isconf.pm
*** lib/perl5/Isconf.pm 11 Feb 2003 17:22:49 -0000      1.3
--- lib/perl5/Isconf.pm 18 Feb 2003 13:23:15 -0000
***************
*** 255,261 ****
                error("File $file does not have a sum set."), return;
        }

!       $nsum = qx(cat $file | grep -v '^#' | sum | awk '{print \$1'});
        chomp $nsum;
        unless ($nsum)
        {
--- 256,263 ----
                error("File $file does not have a sum set."), return;
        }

!       $sysv_flag = (defined $ENV{'IS_OS'} && $ENV{'IS_OS'} eq 'linux')
? " -s
" : "";
!       $nsum = qx(cat $file | grep -v '^#' | sum $sysv_flag | awk
'{print \$1'}
);
        chomp $nsum;
        unless ($nsum)
        {


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