There is a statement
stty onlcr 0>&1
in rc.sysvinit file. What does exactly this line do? What's the reason for redirecting stdin to stdout?
Super User is a question and answer site for computer enthusiasts and power users. It only takes a minute to sign up.Sign up to join this community
$ man stty ... * [-]onlcr translate newline to carriage return-newline ...
and there's even a comment in the file, which you failed to mention:
# Set onlcr to avoid staircase effect.
So that should make it clear what the line does.
stty operates on
stdin by default, but this line changes output settings, so
0>&1 makes it work on
stdout. Which can actually matter if you've a box where the console stdout is hooked up to one serial port, and the console stdin input to some other source ...
stty changes terminal parameters. To do so, it must issue system calls which operate on a file handle that correspond to a terminal. By default, this is
stdin, as the manpage says:
-F, --file=DEVICE open and use the specified DEVICE instead of stdin
I'm not sure what kind of example would help you ...