Re: Shell input redirection question

[<Jim.Dailey@dell.com>]

The shell's pci command was not written to read from standard input. It
expects all its input on the command line.

I would say in general that if you execute a command and pass it no
parameters, and it then prompts you in some way for input, then that
command will likely accept input redirected from a file.

If you execute pci without any parameters, it simply lists all the
devices in the system and terminates, so it clearly is not prepared to
read from standard input (or a redirected file).

It is strictly up to whomever writes a program/command whether they do
so in a manner that allows it to accept input from standard input. For
example, I have written a grep utility for the shell that expects one or
more filenames to search to be on the command line; however, if there
are no filenames on the command line, the utility searches standard
input.

Regards,
Jim

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Tiger Liu
Sent: Thursday, September 21, 2017 1:11 AM
To: edk2-devel@lists.01.org
Subject: [edk2] Shell input redirection question

Hi, experts:
I have a question about input redirection in Shell environment.

Take pci command as sample.
I wrote a txt file(file name is : inputsample.txt), its content is:
00 00 01 -i
00 00 02 –i

It means I just wanted to dump D0F1/D0F2’s config space.

Then, I use this command sequence in shell :
pci <a inputsample.txt

But it seems not recognize this input file’s content.

Why?

Thanks

best wishes,


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