On 3/14/11 Mon Mar 14, 2011 1:49 PM, "Mark" <goo...@markginsburg.com> scribbled:
> I need to detect if input has been to my script or not. > > For example, I would like to differentiate between an invocation from > the two lists below: > > Examples where input is "provided": > perl myscript.pl input.txt > perl myscript.pl < input.txt > executable_that_writes_to_sdtout | perl myscript.pl > > Example of where no input is "provided": > perl myscript.pl > > I'm using Windows XP. > The standard Unix function for determining this is isatty(in fd), where fd is the file descriptor for the input/output stream. I don't know the equivalent in Windows. However, there is the file test operator -t that returns true if "Filehandle is opened to a tty", and the POSIX module includes the isatty function. Try those. perldoc -f -X perldoc POSIX -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
