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Full Discussion: Catching print jobs.
Top Forums UNIX for Dummies Questions & Answers Catching print jobs. Post 302228208 by Danny.Chouinard on Saturday 23rd of August 2008 01:00:39 PM
Old 08-23-2008
"UNIX" can mean a lot of things.

Ok, here's what you can do, replace lpr with a script.

First, find out where it lives. Let's say for example it's /usr/bin/lpr.

Then replace with a script that logs how it's called and tries to copy the printer output to a file.

Code:
$ su
Password:
# mv /usr/bin/lpr /usr/bin/real.lpr
cat > /usr/bin/lpr
#!/bin/sh
exec >/tmp/lpr.debug 2>&1
set +xv
echo "Lpr called on `date` with these arguments:"
echo "0:$0 1:$1 2:$2 3:$3 4:$4 5:$5 6:$6 7:$7 8:$8 9:$9"
filenames=""
args=""
while [ $# -gt 0 ]; do
  case $1 in
    -* ) args="$args $1" ;;
    * ) filenames="$filenames $1" ;;
  esac
  shift
done
if [ "$filenames" = "" ]; then
  filenames=/tmp/lpr.stdin
  cat > /tmp/lpr.stdin
fi
cat /dev/null > /tmp/lpr.output
for f in $filenames; do
  cat $f >> /tmp/lpr.output
done
exec /usr/bin/real.lpr $* < /tmp/lpr.output
exit 0
^D
# chmod 755 /usr/bin/lpr

That should get you started. Check /tmp/lpr.debug to see what's happening.
 

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LEARN ABOUT DEBIAN

t4014

tplot(1)                                                           User Commands                                                          tplot(1)

NAME

       tplot, t300, t300s, t4014, t450, tek, ver - graphics filters for various plotters

SYNOPSIS

       /usr/bin/tplot [-T terminal]

DESCRIPTION

       tplot  reads  plotting  instructions  from  the standard input and produces plotting instructions suitable for a particular terminal on the
       standard output.

       If no terminal is specified, the environment variable TERM is used.  The default terminal is tek.

ENVIRONMENT VARIABLES

       Except for ver, the following terminal-types can be used with `lpr -g' (see lpr) to produce plotted output:

       300             DASI 300 or GSI terminal (Diablo(R) mechanism).

       300s | 300S     DASI 300s terminal (Diablo mechanism).

       450             DASI Hyterm 450 terminal (Diablo mechanism).

       4014 | tek      Tektronix 4014 and 4015 storage scope with Enhanced Graphics Module. (Use 4013 for  Tektronix  4014  or  4015  without  the
                       Enhanced Graphics Module).

       ver             Versatec(R) D1200A printer-plotter. The output is scan-converted and suitable input to `lpr -v'.

FILES

       /usr/lib/t300

       /usr/lib/t300s

       /usr/lib/t4014

       /usr/lib/t450

       /usr/lib/tek

       /usr/lib/vplot

ATTRIBUTES

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

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

SEE ALSO

       lp(1), vi(1), attributes(5)

SunOS 5.10                                                          14 Jul 1994                                                           tplot(1)
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