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Full Discussion: Bash INKEY$ function...
Top Forums UNIX for Dummies Questions & Answers Bash INKEY$ function... Post 302785499 by Corona688 on Monday 25th of March 2013 06:15:07 PM
Old 03-25-2013
What read -n 1 is doing here is probably something like stty -icanon min 1 ; get_character ; reset

...since it's not BASH that's preventing you from reading one at a time, but the terminal itself. Usually it's in "canon" mode, or line-by-line.
 

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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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