reading input from a file

nadbar · #1 (**permalink**) 01-07-2009

I am trying to read input for a C program (that expects input from the user) from a file using the shell command:
progname < filename
but it seems that the program considers the char '<'
as the first input, hence causing an "error" in my program.
I checked it with another program and it seems to work properly.
any idea waht could be wrong?

Franklin52 · #2 (**permalink**) 01-07-2009

Post your code within code tags.

Regards

JerryHone · #3 (**permalink**) 01-07-2009

Are you :-
a) taking an argument on the command line and explicitly opening the filename specified in the program?
or
b) is your C program reading standard input?

From your description, it sounds like the program is written assuming (a) but you're attempting to run it assuming (b) i.e. the '<' is causing the shell to open the file and redirect it to your program as STDIN.

As Franklin52 says, a code fragment would clarify things.

Hope that helps.

Jerry

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