After search it seems the ascii of EOF is -1,but how can I echo it out?
My purpose of doing this is to test whether it behaves the same as pressing ctrl-d if I just echo out EOF.
Asked
Active
Viewed 2.8k times
2 Answers
12
There is no way to echo out an EOF. An EOF can only be generated either by reaching the end of a file or by invoking the keypress bound to the eof terminal setting (CtrlD by default) when the file being read is bound to the terminal.
Ignacio Vazquez-Abrams
- 45,019
- 5
- 78
- 84
-
isn't `EOF` defined as `-1` in stdio.h? why can't echo it out if we know its ascii value? – locale Jun 08 '11 at 09:13
-
So what. An `int` with the value of -1 (or 4294967295 if we consider the unsigned version) can't possibly be a character anyway since characters can only have a value from 0 to 255 inclusive. – Ignacio Vazquez-Abrams Jun 08 '11 at 09:15
-
how do you know it's an `int` in the first place? – locale Jun 08 '11 at 09:18
-
6Because I do things like look at the `fgetc(3)` man page. – Ignacio Vazquez-Abrams Jun 08 '11 at 09:20
10
In bash you could write exec 1>&- in order to close the file descriptor known as stdout.
As Ignacio already said, EOF is not a character, so the question how to "echo EOF" doesn't make any sense in the first place. You can echo characters (bytes) or you can close a file descriptor, but you can never echo an EOF.
lekro
- 109
- 2