A easy example to tell you what is & quot; 2 & gt; & amp; 1 & quot; in Perl, easyexample

A easy example to tell you what is "2> & 1" in Perl, easyexample

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

Testing script:

Print "without null \ n ";

System ("dir2> & 1");

 

Print "with null \ n ";

System ("dir>NUL");

 

Print "end \ n ";

 

Result:

C: \ Rebecca \ script \ perl \ Unicode> perl calculate. pl

Without null

Volume in drive C isOSDisk

Volume Serial Numberis BA23-5612

 

Directory of C: \ Rebecca \ script \ perl \ Unicode

 

01/22/2015 PM <DIR>.

01/22/2015 PM <DIR> ..

01/22/2015 PM 227 calculate. pl

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

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

3 File (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