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Full Discussion: Controlling user input
Top Forums Shell Programming and Scripting Controlling user input Post 303038292 by Chubler_XL on Thursday 29th of August 2019 05:51:12 PM
Old 08-29-2019
Nice idea Corona668 .

I don't have access to MacOS, I'm amazed the most recent releases ship with a 12 year old shell (whats going on there). Checking the exit status of read after the stty command appears to work OK in bash 4.4.12 and 5.0.7

Code:
# Timeout is 1/10 of a second, minimum read is 0 characters
stty -icanon min 0 time 1

# Continue until read finds nothing
while read 2> /dev/null ; do : ; done

# Reset terminal to normal
stty sane

I found the redirect of stderr necessary because cygwin sometimes reports read: read error: 0: Resource temporarily unavailable, but I never caught it not flushing all the input.
This User Gave Thanks to Chubler_XL For This Post:
 

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stty(2) 							System Calls Manual							   stty(2)

NAME
stty(), gtty() - control terminal device (Bell Version 6 compatibility) SYNOPSIS
Remarks These system calls are preserved for backward compatibility with Bell Version 6. They provide as close an approximation as possible to the old Version 6 functions. All new code should use the and calls described in termio(7). DESCRIPTION
For certain status settings and status inquiries about terminal devices, the functions and are equivalent to and respectively (see ioctl(2) and termio(7). RETURN VALUE
and return the following values: Successful completion. Failure. is set to indicate the error. ERRORS
If or fails, is set to one of the following values: [EBADF] is not a valid file descriptor. [EFAULT] points to an invalid address. WARNINGS
Obsolescent Interfaces and are to be obsoleted at a future date. SEE ALSO
stty(1), exec(2), ioctl(2), sttyV6(7), termio(7), tty(7). TO BE OBSOLETED stty(2)
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