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How to get lines with only one occurence of pattern?

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Top Forums Shell Programming and Scripting How to get lines with only one occurence of pattern?
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Old 12-27-2016
Thanks everybody, I found the awk-based solution checking on NF==2 as the most appropriate. This is because I oversimplified the sample I posted, actual data has records with three and more sets and I don't have perl available in this environment.
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LEARN ABOUT DEBIAN

hbpldecode

hbpldecode(1)						      General Commands Manual						     hbpldecode(1)

NAME

       hbpldecode - Decode a HBPL stream into human readable form.

SYNOPSIS

       hbpldecode [options] <hbpl-file

DESCRIPTION

       hbpldecode decodes a HBPL stream into human readable form.

       A HBPL stream is the printer langauge used by the Fuji-Xerox cp105b and the Dell 1250c printers.

COMMAND LINE OPTIONS

       These are the options that can appear on the command line.

       -d basename
	      Basename of .pbm file for saving decompressed planes.

       -h     Print hex file offsets.

       -o     Print file offsets.

       -D level
	      Set Debug level [0].

EXAMPLES

       Decode an HBPL stream file.

       $ hbpldecode -h 1250c-mono.prn
	    0:	  33%-12345X@PJL JOB MODE=PRINTER
	   1f:	  @PJL SET STRINGCODESET=UTF8
	   3b:	  @PJL COMMENT DATE=06/01/2011
	   58:	  @PJL COMMENT TIME=13:28:30
	   73:	  @PJL COMMENT DNAME=empty - Notepad
	   96:	  @PJL SET JOBATTR="@LUNA=rick"
	   b4:	  @PJL SET COPIES=1
	   c6:	  @PJL SET QTY=1
	   d5:	  @PJL SET JOBATTR="@TRCH=OFF"
	   f2:	  @PJL SET DUPLEX=OFF
	  106:	  @PJL SET BINDING=LONGEDGE
	  120:	  @PJL SET RENDERMODE=GRAYSCALE
	  13e:	  @PJL SET ECONOMODE=OFF
	  155:	  @PJL SET RET=ON
	  165:	  @PJL SET JOBATTR="@IREC=OFF"
	  182:	  @PJL SET JOBATTR="@HOAD=I0A00020F"
	  1a5:	  @PJL SET JOBATTR="@JOAU=rick"
	  1c3:	  @PJL SET JOBATTR="@CNAM=RICK-VB"
	  1e4:	  @PJL SET IWAMANUALDUP=OFF
	  1fe:	  @PJL SET IWAJAMRECOVERY=AUTO
	  21b:	  @PJL SET JOBATTR="@MSIP=NORMAL"
	  23b:	  @PJL SET PAPERDIRECTION=SEF
	  257:	  @PJL SET RESOLUTION=600
	  26f:	  @PJL SET BITSPERPIXEL=8
	  287:	  @PJL SET JOBATTR="@DRDM=RASTER"
	  2a7:	  @PJL SET JOBATTR="@TCPR=33"
	  2c3:	  @PJL SET JOBATTR="@TUCR=33"
	  2df:	  @PJL SET JOBATTR="@TTRC=33"
	  2fb:	  @PJL SET JOBATTR="@TSCR=33"
	  317:	  @PJL SET JOBATTR="@GCPR=33"
	  333:	  @PJL SET JOBATTR="@GUCR=33"
	  34f:	  @PJL SET JOBATTR="@GTRC=33"
	  36b:	  @PJL SET JOBATTR="@GSCR=33"
	  387:	  @PJL SET JOBATTR="@ICPR=34"
	  3a3:	  @PJL SET JOBATTR="@IUCR=34"
	  3bf:	  @PJL SET JOBATTR="@ITRC=34"
	  3db:	  @PJL SET JOBATTR="@ISCR=34"
	  3f7:	  @PJL SET JOBATTR="@TDFT=0"
	  412:	  @PJL SET JOBATTR="@GDFT=0"
	  42d:	  @PJL SET JOBATTR="@IDFT=0"
	  448:	  @PJL ENTER LANGUAGE=HBPL
	  461:	  RECTYPE 'A' [0x41]:
	  462:	       81 a1: 0x0
	  465:	       82 a2: 0x7
	  469:	       83 a2: 0x1
	  46d:	  RECTYPE 'C' [0x43]:
	  46e:	       91 a1: 0x0
	  471:	       92 a1: 0x1
	  474:	       93 a1: 0x1
	  477:	       94 a1: 0x0
	  47a:	       95 c2: 0x0
	  480:	       96 a1: 0x0
	  483:	       97 c3: 0x0
	  489:	       98 a1: 0x0
	  48c:	       99 a4: 1 [PAGECNT]
	  492:	       9a c4: 5104x6600 [WxH]
	  49c:	       9b a1: 0x0
	  49f:	       9c a1: 0x1
	  4a2:	       9d a1: 0x9
	  4a5:	       9e a1: 0x2
	  4a8:	       9f a1: 0x5
	  4ab:	       a0 a1: 0x8
	  4ae:	       a1 a1: 0x0
	  4b1:	       a2 c4: 5104x6600 [WxH]
	  4bb:	  RECTYPE 'Q' [0x51]:
	  4bc:	  RECTYPE 'R' [0x52]:
	  4bd:	       a3 a1: 0x0
	  4c0:	       a4 a2: 6457 (0x1939) bytes of data...
	 1dfe:	  RECTYPE 'S' [0x53]:
	 1dff:	  RECTYPE 'D' [0x44]:
	 1e00:	  RECTYPE 'B' [0x42]:
	 1dff:	  33%-12345X@PJL EOJ

FILES

       /usr/bin/hbpldecode

AUTHOR

       Rick Richardson <rick.richardson@comcast.net>