A.P. Lawrence

Using Netcat for a simple lpr client

Are you looking for FAQ: what is netcat and how do I use it?

If you like you can even use a simple shell/awk-script to build a lpr like client arount netcat.

It looks like this:

#!/bin/sh
# Simple pseude lpr-like client for transmission of arbitrary controlfile
# parameters
# Carsten Hammer <Hammer.Carsten@oce.de>, 2002
#set -x
# Programmname zielhost queuename
# Counter maintained in /tmp/nr

echo "Host:" $1
echo "Queue:" $2
echo "Dateiname:" $3

Size=`ls -lL $3|tr -s ' '|cut -d' ' -f5`
echo "Dateigr�sse:" $Size

# netcat
NC=/usr/local/bin/nc

awkscript="BEGIN {
n=sprintf(\"%03d\",ARGV[2] +0);
size=sprintf(\"%d\",ARGV[3] +0);
queuename=ARGV[1]
c=c \"HSYSM\n\"
c=c \"PSAF0006\n\"
c=c \"fdfA\"n\"SYSM\n\"
c=c \"UdfA\"n\"SYSM\n\"
c=c \"NDEFSYSM.SAF0006.SAF00066.JOB07513.D0000103.?\n\"
c=c \"-odatat=l\n\"
c=c \"-ofileformat=record\n\"
c=c \"-occ=yes\n\"
c=c \"-oro=e\n\"
c=c \"-occtype=a\n\"
c=c \"-ochars=315A\n\"
c=c \"-ocop=001\n\"
c=c \"-ous=SAF0006\n\"
c=c \"-ono=DEFSYSM\n\"
c=c \"-opr=AUGUST\n\"
c=c \"-opa=forms=STD,class=8,destination=PWSCHU01\n\"

clen=sprintf(\"%04d\",length(c))
ca=ca\"\002\"queuename\"\n\"
ca=ca\"\002\"clen\" cfA\"n\"SYSM\n\"
e= \"+\"
da=da \"\003\"size\" dfA\"n\"SYSM\n\"
e= \"+\"
printf ca
printf c
printf e
printf da
}"

if [ ! -f "/tmp/nr" ] ; then echo "1" >/tmp/nr; fi
awk '{ print $1+1 }' /tmp/nr.bak;mv /tmp/nr.bak /tmp/nr
{ awk "$awkscript" "$2" "`cat /tmp/nr`" "$Size"|tr '+' '\000';cat $3;printf
'\000';}|\
$NC -v -v  -w 2 -o bla.log $1 515

# print any waiting jobs
#printf "\001blubb\n" | $NC -v localhost 515
# send queue state (short)
#printf "\003blubb\n" | $NC -v localhost 515
# send queue state (long)
#printf "\004blubb\n" | $NC -v localhost 515
#printf "\004oce\n" | $NC -v localhost 515

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/Unixart/netcatlpr.html copyright September 2002 Carsten Hammer All Rights Reserved

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