system function behaviour

dharanivasan has asked for the wisdom of the Perl Monks concerning the following question:

What different between below system() function call.
First one wait until specified sleep values . But second one does not .
Note :
+ I have to run child as background process
+ Parent process should not wait for the child process completion.
code of bar.pl file :

use strict;
use warnings;

print "Before background process start \n";
system("foo.pl","&");
#system("foo.pl  & ");
print "After  background process start ";
[download]

code of foo.pl file :

use strict;
use warnings;

sleep(100);
[download]

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Re: system function behaviour by lakshmananindia (Chaplain) on Apr 04, 2009 at 06:35 UTC
`system("foo.pl","&");#& will pass as an argument to foo.pl #Try printing the @ARGV in foo.pl.` [download] `system("foo.pl &"); #Process runs in the background.` [download] --Lakshmanan G. The great pleasure in my life is doing what people say you cannot do.	[reply] [d/l] [select]
Re^2: system function behaviour by Anonymous Monk on Apr 04, 2009 at 06:41 UTC
Proc::Background	[reply]
Re: system function behaviour by shmem (Chancellor) on Apr 04, 2009 at 12:33 UTC
`system("foo.pl","&");` [download] This calls `foo.pl` with the character `&` as its first argument. `system("foo.pl & ");` [download] This calls `/bin/sh` (or your appropriate system shell) and passes it the whole string as command. The shell then interprets the `&` as a directive to background the command. The next two are equivalent, but only in the second the shell is involved: `system("foo.pl", "&"); system("foo.pl '&' ");` [download]	[reply] [d/l] [select]
Re: system function behaviour by nagalenoj (Friar) on Apr 04, 2009 at 06:38 UTC
Dear monk, Hope this will help you system.	[reply]