scan_df

UNIX下perl实现代码

#!/usr/bin/perl -P

# $RCSfile: scan_df,v $$Revision: 4.1 $$Date: 92/08/07 17:20:33 $

# This report points out filesystems that are in danger of overflowing.

(chdir '/usr/adm/private/memories') || die "Can't cd to memories: $!\n";
`df >newdf`;
open(Df, 'olddf');

while (<Df>) {
    ($fs,$kbytes,$used,$avail,$capacity,$mounted_on) = split;
    next if $fs =~ /:/;
    next if $fs eq '';
    $oldused{$fs} = $used;
}

open(Df, 'newdf') || die "scan_df: can't open newdf";

while (<Df>) {
    ($fs,$kbytes,$used,$avail,$capacity,$mounted_on) = split;
    next if $fs =~ /:/;
    next if $fs eq '';
    $oldused = $oldused{$fs};
    next if ($oldused == $used && $capacity < 99);	# inactive filesystem
    if ($capacity >= 90) {
#if defined(mc300) || defined(mc500) || defined(mc700)
	$_ = substr($_,0,13) . '        ' . substr($_,13,1000);
	$kbytes /= 2;		# translate blocks to K
	$used /= 2;
	$oldused /= 2;
	$avail /= 2;
#endif
	$diff = int($used - $oldused);
	if ($avail < $diff * 2) {	# mark specially if in danger
	    $mounted_on .= ' *';
	}
	next if $diff < 50 && $mounted_on eq '/';
	$fs =~ s|/dev/||;
	if ($diff >= 0) {
	    $diff = '(+' . $diff . ')';
	}
	else {
	    $diff = '(' . $diff . ')';
	}
	printf "%-8s%8d%8d %-8s%8d%7s    %s\n",
	    $fs,$kbytes,$used,$diff,$avail,$capacity,$mounted_on;
    }
}

rename('newdf','olddf');