Description
tty displays
the file name of the terminal device associated with the standard
input.
Options
- –s
- Does not display the name; the exit status of tty indicates
whether the standard input is a terminal.
Localization
tty uses
the following localization environment variables:
- LANG
- LC_ALL
- LC_CTYPE
- LC_MESSAGES
- NLSPATH
See Localization for more
information.
Exit values
- 0
- Standard input is a terminal
- 1
- Standard input is not a terminal
- 2
- Failure because of an unknown command-line option, or too many
arguments
Messages
Possible error messages include:
- Not a tty
- The standard input is not associated with a terminal.
Portability
POSIX.2, X/Open Portability Guide, UNIX systems.
The
POSIX standard considers the -s option to
be obsolete.