NAME

tty − get the name of the terminal

SYNOPSIS

tty [ −l ] [ −s ]

DESCRIPTION

tty prints the path name of the user’s terminal. 

−l prints the synchronous line number to which the user’s terminal is connected, if it is on an active synchronous line. 

−s inhibits printing of the terminal path name, allowing one to test just the exit code. 

EXIT CODES
2if invalid options were specified,
0if standard input is a terminal,
1otherwise.

DIAGNOSTICS

“not on an active synchronous line” if the standard input is not a synchronous terminal and −l is specified. 
“not a tty” if the standard input is not a terminal and −s is not specified. 

March 13, 1992