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@defun read-line
@defunx read-line port
Returns a string of the characters up to, but not including a
newline or end of file, updating @var{port} to point to the
character following the newline. If no characters are available, an
end of file object is returned. The @var{port} argument may be
omitted, in which case it defaults to the value returned by
@code{current-input-port}.
@end defun
@deffn {Procedure} read-line! string
@deffnx {Procedure} read-line! string port
Fills @var{string} with characters up to, but not including a newline or end
of file, updating the @var{port} to point to the last character read
or following the newline if it was read. If no characters are
available, an end of file object is returned. If a newline or end
of file was found, the number of characters read is returned.
Otherwise, @code{#f} is returned. The @var{port} argument may be
omitted, in which case it defaults to the value returned by
@code{current-input-port}.
@end deffn
@defun write-line string
@defunx write-line string port
Writes @var{string} followed by a newline to the given @var{port} and returns
an unspecified value. The @var{Port} argument may be omitted, in
which case it defaults to the value returned by
@code{current-input-port}.
@end defun
@defun system->line command tmp
@defunx system->line command
@var{command} must be a string. The string @var{tmp}, if supplied, is a path to use as
a temporary file. @code{system->line} calls @code{system} with @var{command} as argument,
redirecting stdout to file @var{tmp}. @code{system->line} returns a string containing the
first line of output from @var{tmp}.
@code{system->line} is intended to be a portable method for getting one-line results
from programs like @code{pwd}, @code{whoami}, @code{hostname},
@code{which}, @code{identify}, and @code{cksum}. Its behavior when
called with programs which generate lots of output is unspecified.
@end defun
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