A easy example to tell you what is "2>&am

发布时间：2020-12-15 23:48:18 所属栏目：大数据来源：网络整理

导读：You can decide if make the output shown on command screen by using 21 or NUL Testing script: print "without null n"; system("dir? 21 "); ? print "with null n"; system("dir NUL "); ? print "end n"; ? Result: C:RebeccascriptperlUnicod

You can decide if make the output shown on command screen by using 2>&1 or NUL

Testing script:

print "without null n";

system("dir?2>&1");

print "with null n";

system("dir > NUL");

print "end n";

Result:

C:RebeccascriptperlUnicode>perl calculate.pl

without null

?Volume in drive C isOSDisk

?Volume Serial Numberis BA23-5612

?Directory of C:RebeccascriptperlUnicode

01/22/2015? 04:59PM??? <DIR>????????? .

01/22/2015? 04:59PM??? <DIR>????????? ..

01/22/2015? 04:58PM?????????????? 227 calculate.pl

01/22/2015? 09:19AM?????????????? 194 unicode_test_v1.pl

01/21/2015? 05:23PM?????????????? 193unicode_test_v1.pl.ba

?????????????? 3File(s)??????????? 614 bytes

?????????????? 2Dir(s)? 175,476,535,296 bytes free

with null ? #you can see with NUL,there isn't any output shown here

end

（编辑：李大同）

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A easy example to tell you what is &#34;2&gt;&am

A easy example to tell you what is "2>&am