User Commands  - tty- (1)

NAME
tty-(1f) - [FUNIX:FILESYSTEM] print information about the file/terminal connected to standard input (LICENSE:PD)

CONTENTS

Synopsis
Description
Options
Example
Reporting Bugs
See Also
Author
License

SYNOPSIS
tty- [OPTION]...

DESCRIPTION
Call INQUIRE(3f) and print information about the file name of the terminal connected to standard input. The results are dependent on the programming environment used, as some of the behavior is system dependent.

OPTIONS
--help display this help and exit
--version
  output version information and exit

EXAMPLE
The standard leaves quite a bit as system dependent. It is always interesting. For example, on CygWin using gfortran V5.4

If I just type in the command at a prompt the INPUT_UNIT of 5 is returned as unit 0. But if I call the tty- from within vim(1) it is returned as 5. 

        tty-
        > for INPUT_UNIT=5
        >====================================================
        >*print_inquire* checking file:/dev/pty10
        >*print_inquire* file exists
        >*print_inquire* using unit number  0
        >*print_inquire* access type SEQUENTIAL,FORMATTED
Even though the file is not a terminal but exists I get a name of "stdin". Other compilers return a null filename, others return the name of the redirected file. What if there was actually a file called "stdin"? 

        tty- </dev/null
        > for INPUT_UNIT=5
        >====================================================
        >*print_inquire* checking file:stdin
        >*print_inquire* file does not exist
Try these: 

        tty- # a simple call from the keyboard
        tty- </tmp/notthere # a file assumed to not exist
        tty- </dev/null   # a special file that exists
        tty- </etc/passwd # some non-terminal file that exists
        tty- < ‘tty‘      # reading the pathname of your terminal
        tty- < /dev/pty08 # some TTY not assigned to your ID

REPORTING BUGS
Report _yes bugs to <http://www.urbanjost.altervista.org/index.html>

SEE ALSO
isatty(3c),tty(1), ttyname(3)

AUTHOR
John S. Urban

LICENSE
Public Domain

Nemo Release 3.1 tty- (1) February 23, 2025
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