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Full Discussion: Transpose Messy Data
Top Forums UNIX for Advanced & Expert Users Transpose Messy Data Post 302943014 by 91674io on Monday 4th of May 2015 03:28:04 PM
Old 05-04-2015
Transpose Messy Data

I have a messy, pipe-delimited ("|") input dataset.

I would like to create a file of ID plus each component of field 4 which is delimited by ";" into a long, skinny shape for easier processing.

A couple of complications are that field 4 may contain both commas and linefeed characters from the source.

Sample data looks like:

Code:
ID1|VAR2|VAR3|VAR4|VAR5
ID2|VAR2|VAR3|PART1;PART2|1;2
ID3|VAR2|VAR3|A, B, C;PART2;BEFORE LF\nAFTER LF|1;2;3
ID4|VAR2|VAR3|1;2;3,;4|1;2;3;4

I would something like data like:

I
Code:
D1|VAR4
ID2|PART1
ID2|PART2
ID3|A, B, C
ID3|PART2
ID3|BEFORE LF  AFTER LF
ID4|1
ID4|2
ID4|3
ID4|4

Is there an elegant way to do this at the command line?

Thanks!

Last edited by Corona688; 05-04-2015 at 04:38 PM..
 

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ID3(1)							      General Commands Manual							    ID3(1)

NAME
id3 - an ID3 tag editor. SYNOPSIS
id3 [-tTaAycg newdata] file1 [file2 [file3...]] id3 -l file1 [file2 [file3...]] id3 -d file1 [file2 [file3...]] id3 -L DESCRIPTION
id3 is an ID3 v1.1 tag editor. ID3 tags are traditionally put at the end of compressed streamed audio files to denote information about the audio contents. Up to thirty characters of Title, Artist, and Album information can be stored, as well as a 28-character comment, four- digit year, track number up to 255, and an enumerated genre. OPTIONS
-t title Sets the title tag to the first 28 characters of title. -T track Sets the track tag to a number between 0 and 255. -a artist Sets the artist tag to the first 28 characters of artist. -A album Sets the album tag to the first 28 characters of album. -y year Sets the year tag to the first 4 characters of year. -c comment Sets the comment tag to the first 28 characters of comment. -g genre Sets the genre number tag using a genre number or predefined genre label. -l List/view the ID3 tag. -L List all genre tags. -R Use rfc822-style output for tag printout. -d Delete the ID3 tag. BUGS
The ID3 format has some shortcomings. There is a 1 in 16777216 chance of your mp3 having a certain bit-pattern, causing id3 to write over the last 128 bytes of your mp3 upon tag creation. If you add a track number to an ID3 v1.0 tag, the last two characters of the comment string will be truncated. Any bugs found in id3 should be forwarded to the author, Robert Woodcock <rcw@debian.org>. ID3(1)
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