On Thu, Jun 11, 2009 at 11:47, Tech W.<tech...@yahoo.com.cn> wrote:
snip
> system "command","-a","-b","-c";
snip
In this case Perl runs command directly
snip
> system "command -a -b -c";
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In this case Perl runs the default shell for the OS and has it run command.
snip
> and, which is better?
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Depends on what you are doing. In general, the first is better
because it does not have to spawn a third process and the shell can't
mess with your arguments; however, if you want shell expansion you
need to use the second form:
system "do_something *.txt";
Of course, you can say
system "do_something", glob("*.txt");
But if you want to do something complicated like
system "somecommand | grep foo | othercommand | thirdcommand";
it gets a lot more complicated to do in Perl.
--
Chas. Owens
wonkden.net
The most important skill a programmer can have is the ability to read.
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