osx man page for line

line(1) 							   User Commands							   line(1)

NAME
       line - read one line

SYNOPSIS
       line

DESCRIPTION
       The  line utility copies one line (up to and including a new-line) from the standard input and writes it on the standard output. It returns
       an exit status of 1 on EOF and always prints at least a new-line. It is often used within shell files to read from the user's terminal.

EXIT STATUS
       Exit status is:

       0	Successful completion

       >0	End-of-file on input.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       sh(1), read(2), attributes(5)

SunOS 5.10							    1 Feb 1995								   line(1)