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Top Forums Shell Programming and Scripting need to create lines from ones that begin with the field separator Post 302468703 by script_op2a on Wednesday 3rd of November 2010 02:59:06 PM
Old 11-03-2010
need to create lines from ones that begin with the field separator

Hello,

I need to modify an awk script to recognize the last field $NF when the line is split over more than 1 line.

In my input file the field separator is the exclamation mark ! so FS="!"

So here is my input file infile.txt, it has 2 records, the field separator is in bold:

INPUT

Code:
4888689!?!Change of PROD
!TX!?!DETAILS
!US!?!?!file_937_20101024_065520.txt 

48887370!Change of PROD!?!?!cmt_det3_937_20101024_065520.txt

Before I do anything in the AWK script I need to be able recognize the last field for each line type.

For record type #1 the $NF (last field) is on a different line (I need to be able to get the last field for these) (AWK recognizes record one as being 3 different lines) ($NF would be file_937_20101024_065520.txt)

For record type #2 the $NF (last field) is on the same line (this is the way AWK would read most of them) ($NF would be cmt_det3_937_20101024_065520.txt)

So the rule would be:

If the field separator is the 1st character on the line then look at the previous line until the line does not start with the field separator and so then
$1 would be on the first line and the $NF will be at the end of the last line.

Then print the lines to an output file

OUTPUT

Code:
4888689!?!Change of PROD!TX!?!DETAILS!US!?!?!file_937_20101024_065520.txt 

48887370!Change of PROD!?!?!cmt_det3_937_20101024_065520.txt

Moderator's Comments:
Mod Comment Please use code tags

Last edited by vgersh99; 11-03-2010 at 04:34 PM.. Reason: Please use code tags!
 

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JOIN(1) 						      General Commands Manual							   JOIN(1)

NAME
join - relational database operator SYNOPSIS
join [ options ] file1 file2 DESCRIPTION
Join forms, on the standard output, a join of the two relations specified by the lines of file1 and file2. If file1 is `-', the standard input is used. File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the first in each line. There is one line in the output for each pair of lines in file1 and file2 that have identical join fields. The output line normally con- sists of the common field, then the rest of the line from file1, then the rest of the line from file2. Fields are normally separated by blank, tab or newline. In this case, multiple separators count as one, and leading separators are dis- carded. These options are recognized: -an In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2. -e s Replace empty output fields by string s. -jn m Join on the mth field of file n. If n is missing, use the mth field in each file. -o list Each output line comprises the fields specifed in list, each element of which has the form n.m, where n is a file number and m is a field number. -tc Use character c as a separator (tab character). Every appearance of c in a line is significant. SEE ALSO
sort(1), comm(1), awk(1) BUGS
With default field separation, the collating sequence is that of sort -b; with -t, the sequence is that of a plain sort. The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous. JOIN(1)
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