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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Directory : /usr/share/doc/perl-IPC-System-Simple/examples/

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Current File : //usr/share/doc/perl-IPC-System-Simple/examples/rsync-backup.pl

#!/usr/bin/perl -w

# The following example code uses IPC::System::Simple to mount
# a /mnt/backup directory, run an rsync command, and then unmount
# the directory again.

use strict;
use IPC::System::Simple qw(run capture);
use POSIX qw(nice strftime);
use Fatal qw(open close nice);
use constant NICE_VALUE => 10;

die "Must be root" if $> != 0;

nice(NICE_VALUE);

my $mounted = 0;
my $today   = strftime('%Y-%m-%d',localtime);

# The capture() from IPC::System::Simple either works, or dies.
my $machine_name = capture("hostname");

open(my $mtab_fh, '<', '/etc/mtab');

while (<$mtab_fh>) {
	if (m{/mnt/backup}) {
		$mounted = 1;
		last;
	}
}

close($mtab_fh);

if (not $mounted) { 
	# Our run() from IPC::System::Simple either works, or dies.
	run(qw(/bin/mount /mnt/backup));
}

my $last_backup = '';

foreach my $dir ( glob("/mnt/backup/$machine_name/*") ) {

	next if not -d $dir;

	# 'gt' is correct here, since we're delaing with YYYY-MM-DD
	if ($dir gt $last_backup) {
		$last_backup = $dir;
	}
}

die "Cannot find last backup" unless $last_backup;

#  0 - Successful backup
# 24 - Files disappeared during backup.  This is expected on
#      an active filesystem, and not considered an error.

run([0,24],
	qw(/usr/bin/rsync -aH --exclude-from=/etc/rsync-ignore), 
	"--link-dest=$last_backup","/",
	"/mnt/backup/teddybear/$today",
);

# Unmount our filesystem if we found it unmounted to begin with.
# Again, run() either succeeds, or dies.

if (not $mounted) {
	run(qw(/bin/umount /mnt/backup));
}

haha - 2025