On Fri, 2002-06-14 at 08:14, Angela Fisher wrote:
> Hi,
>
> I replaced qx{ ./test.pl -P @ARGV};
> with exec(" ./test.pl -P @ARGV");
>
> This works. I'm very new at this so excuse the
> question. Can "qx{}" be used to execute a command
> or script? It just looks like a way to quote a string
> to me.
>
> Angela
>
<snip />
qx`` is the proper form of `` just like q'' is the proper form of '' or
qq"" for "". The back ticks issue a fork and exec the command line you
provide sending the stdout back as a list. So
foreach my $line (`ls -l`) {
print $line;
}
is equivalent to saying "ls -l" on the command line. the system
function issues a fork/exec/wait combo that returns the return code from
the program (on most OSes this is -128-127).
The exec function replaces the currently running process with the one
named (hence the fork before the exec in system and qx``).
See The following resources for more info
perldoc -f system
perldoc -f exec
perldoc -f fork
perldoc -f wait
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