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User Commands postio(1)
NAME
postio - serial interface for PostScript printers
SYNOPSIS
postio -l line [-D] [-i] [-q] [-t] [-S] [-b speed] [-B num]
[-L file] [-P string] [-R num] [file...]
/usr/lib/lp/postscript/postio
DESCRIPTION
postio sends files to the PostScript printer attached to
line. If no files are specified the standard input is sent.
OPTIONS
The first group of options should be sufficient for most
applications:
-D Enable debug mode. Guarantees that every-
thing read on line will be added to the log
file (standard error by default).
-q Prevents status queries while files are
being sent to the printer. When status
queries are disabled a dummy message is
appended to the log file before each block
is transmitted.
-b speed Transmit data over line at baud rate speed.
Recognized baud rates are 1200, 2400, 4800,
9600, and 19200. The default speed is 9600
baud.
-B num Set the internal buffer size for reading and
writing files to num bytes. By default num
is 2048 bytes.
-l line Connect to the printer attached to line. In
most cases there is no default and postio
must be able to read and write line. If the
line does not begin with a / it may be
treated as a Datakit destination.
SunOS 5.10 Last change: 9 Sep 1996 1
User Commands postio(1)
-L file Data received on line gets put in file. The
default log file is standard error. Printer
or status messages that don't show a change
in state are not normally written to file
but can be forced out using the -D option.
-P string Send string to the printer before any of the
input files. The default string is simple
PostScript code that disables timeouts.
-R num Run postio as a single process if num is 1
or as separate read and write processes if
num is 2. By default postio runs as a single
process.
The next two options are provided for users who expect to
run postio on their own. Neither is suitable for use in
spooler interface programs:
-i Run the program in interactive mode. Any files are
sent first and followed by the standard input.
Forces separate read and write processes and over-
rides many other options. To exit interactive mode
use your interrupt or quit character. To get a
friendly interactive connection with the printer
type executive on a line by itself.
-t Data received on line and not recognized as printer
or status information is written to the standard
output. Forces separate read and write processes.
Convenient if you have a PostScript program that
will be returning useful data to the host.
The last option is not generally recommended and should only
be used if all else fails to provide a reliable connection:
-S Slow the transmission of data to the printer.
Severely limits throughput, runs as a single pro-
cess, disables the -q option, limits the internal
buffer size to 1024 bytes, can use an excessive
amount of CPU time, and does nothing in interactive
mode.
SunOS 5.10 Last change: 9 Sep 1996 2
User Commands postio(1)
The best performance will usually be obtained by using a
large internal buffer (the -B option) and by running the
program as separate read and write processes (the -R 2
option). Inability to fork the additional process causes
postio to continue as a single read/write process. When one
process is used, only data sent to the printer is flow con-
trolled.
The options are not all mutually exclusive. The -i option
always wins, selecting its own settings for whatever is
needed to run interactive mode, independent of anything else
found on the command line. Interactive mode runs as separate
read and write processes and few of the other options accom-
plish anything in the presence of the -i option. The -t
option needs a reliable two way connection to the printer
and therefore tries to force separate read and write
processes. The -S option relies on the status query mechan-
ism, so -q is disabled and the program runs as a single pro-
cess.
In most cases postio starts by making a connection to line
and then attempts to force the printer into the IDLE state
by sending an appropriate sequence of ^T (status query), ^C
(interrupt), and ^D (end of job) characters. When the
printer goes IDLE, files are transmitted along with an occa-
sional ^T (unless the -q option was used). After all the
files are sent the program waits until it's reasonably sure
the job is complete. Printer generated error messages
received at any time except while establishing the initial
connection (or when running interactive mode) cause postio
to exit with a non-zero status. In addition to being added
to the log file, printer error messages are also echoed to
standard error.
EXAMPLES
Example 1: Examples of the postio command.
Run as a single process at 9600 baud and send file1 and
file2 to the printer attached to /dev/tty01:
example% postio -l /dev/tty01 file1 file2
Same as above except two processes are used, the internal
buffer is set to 4096 bytes, and data returned by the
printer gets put in file log:
example% postio -R 2 -B 4096 -l/dev/tty01 -L log file1 file2
Establish an interactive connection with the printer at
Datakit destination my/printer:
SunOS 5.10 Last change: 9 Sep 1996 3
User Commands postio(1)
example% postio -i -l my/printer
Send file program to the printer connected to /dev/tty22,
recover any data in file results, and put log messages in
file log:
example% postio -t -l /dev/tty22 -L log program >results
EXIT STATUS
The following exit values are returned:
0 Successful completion.
non-zero An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWpsf |
|_____________________________|_____________________________|
SEE ALSO
download(1), dpost(1), postdaisy(1), postdmd(1), postmd(1),
postprint(1), postreverse(1), posttek(1), attributes(5)
NOTES
The input files are handled as a single PostScript job.
Sending several different jobs, each with their own internal
end of job mark (^D) is not guaranteed to work properly.
postio may quit before all the jobs have completed and could
be restarted before the last one finishes.
All the capabilities described above may not be available on
every machine or even across the different versions of the
UNIX system that are currently supported by the program.
There may be no default line, so using the -l option is
strongly recommended. If omitted, postio may attempt to con-
nect to the printer using the standard output. If Datakit is
involved, the -b option may be ineffective and attempts by
postio to impose flow control over data in both directions
may not work. The -q option can help if the printer is con-
nected to RADIAN. The -S option is not generally
SunOS 5.10 Last change: 9 Sep 1996 4
User Commands postio(1)
recommended and should be used only if all other attempts to
establish a reliable connection fail.
SunOS 5.10 Last change: 9 Sep 1996 5
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This page was generated on Wed Sep 12 11:25:15 GMT 2007
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