awk in UNIX to split a file based on change in field of header records and group them into files. TRU64 IBM UX

Posted on 2012-03-30
Last Modified: 2012-04-03
Need an awk or sed command which will split a file based on a change of PO number in the HDR record.

If /^HDR/ evaluate expression from position 47 through 57.  
     If expression in 47 through 57 is unchanged when compared with last HDR, keep record with the last HDR850 and DET grouping.
     If expression in 47 through 57 changes from last HDR split to a new file.

For example a file contains multiple HDR records, grouped on the field beginning in position 47.  Group the HDR and associated DET records together by PO number contained int the field at postion 47.

HDR850                              VPD        C20731589
HDR850                              VPD        C20731589
HDR850                              VPD        C20731590
HDR850                              VPD        C20731591
Question by:eshapley
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LVL 84

Expert Comment

ID: 37789988
awk '/^HDR/{file=substr($0,47,11)}{print >>file}'
LVL 51

Expert Comment

ID: 37790150
# same as ozo's solution but more lazy
gawk '/^HDR/{f=$NF}{print > f}'

IIRC, traditional AT&T awk does not support "print >file", hence gawk

Author Comment

ID: 37797564
First tried:
/fdmdev/edi-imp>awk `/^HDR/{ProEDI.SHP=substr($0,47,11)}{print>>ProEDI.SHP}`
ksh: 0403-057 Syntax error: `(' is not expected.

Next tried:
awk `/^HDR/{ProEDI.DSH=substr($0,47,11)} {print>>/fdmdev/edi-imp/splitfiles1/proedi.dsh1}

ksh: 0403-057 Syntax error: `(' is not expected.

I tried this command:
awk 'BEGIN { i=0 } /^HDR/ {file=substr($0,47,11)} {++i} { print > "/fdmdev/edi-imp/splitfiles1/ProEDI.DSH."(i) }' /fdmdev/edi-imp/ProEDI.DSH

It ran, but created a new file for every record regardless of whether the record began with HDR or DET.  I need it to create a separate file only when the record is HDR and the PO number in that record changes.
LVL 84

Accepted Solution

ozo earned 500 total points
ID: 37798597
you used ` where you should have used '

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