openInOut
openInOut "fff" -- opens an input output file whose
filename is fff.
openInOut "!cmd" -- opens an input file which corresponds to a pipe
receiving the output from the shell command cmd.
openInOut "$hostname:service" -- opens an input output file
by connecting to the specified service port at the specified host.
openInOut "$:service" -- opens an input output file by
listening to the specified service port on the local host, and
waiting for an incoming connection.
openInOut "$hostname" -- opens an input output file
by connecting to the Macaulay2 service port (2500) at the specified host.
openInOut "$" -- opens an input output file by listening to the
Macaulay2 service port (2500) on the local host, and waiting for an
incoming connection.
openInOut f -- opens an input output file by accepting a
connection to the listener f, previously created with
openListener.
In order to open a socket successfully, there must be a process
accepting connections for the desired service on the specified host.
Socket connections are not available on Sun computers, because Sun
doesn't provide static versions of crucial libraries dealing with
network communications, or the static version doesn't provide network
name service for looking up hostnames.
The various forms listed above can be used also with openIn
and openOut, with data transfer possible only in the
direction specified.The return value is of type File. See File for information
about how to use such values.
