Solved

Cygwin / Bash - Join command not working as expected

Posted on 2010-09-10
4
893 Views
Last Modified: 2013-11-15
I have two CSV files I need to combine.
Both of them share a key column (ID), but each file has unique columns otherwise.
Not all of the IDs in the first file have matches in the second file.  

I would like the output to include ALL rows from the first file whether they match or not.  The rows that did have a match need the additional columns appended.

This seems to be a fairly common question floating around on the internet. The most common solution I found was to use 'join'.  However, it isn't behaving as I was expecting.



$ ls
test1.csv  test2.csv

$ cat test1.csv
22,Charles,Stross,388
33,William,Shakespeare,389
44,Michael,Jackson,385
55,Tom,Green,103
58,Edgar,Poe,22
66,John,Doe,938
99,Jane,Doe,2388

$ cat test2.csv
22,Stories,10/27/1983
33,Plays,12/31/1980
44,Music,7/23/1937

$ join -a 1 -t , test1.csv test2.csv
,Stories,10/27/198388
,Plays,12/31/1980peare,389
,Music,7/23/1937on,385
55,Tom,Green,103
58,Edgar,Poe,22
66,John,Doe,938
99,Jane,Doe,2388


The output seems to be dropping the "key" value from any rows that match, and I have no idea why the text is overlapping (for example, the Date on output Line 3 is overwriting the name).

Any suggestions?  
0
Comment
Question by:Proots
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 33651437
join -a 1 -t , test1.csv test2.csv
22,Charles,Stross,388,Stories,10/27/1983
33,William,Shakespeare,389,Plays,12/31/1980
44,Michael,Jackson,385,Music,7/23/1937
55,Tom,Green,103
58,Edgar,Poe,22
66,John,Doe,938
99,Jane,Doe,2388

is it possible you have an extra \r character at the end of the lines in test1.csv?
what do you see with
join -a 1 -t , test1.csv test2.csv | cat -v
0
 
LVL 2

Author Comment

by:Proots
ID: 33652073
$ join -a 1 -t , test1.csv test2.csv
,Stories,10/27/198388
,Plays,12/31/1980peare,389
,Music,7/23/1937on,385
55,Tom,Green,103
58,Edgar,Poe,22
66,John,Doe,938
99,Jane,Doe,2388


$ join -a 1 -t , test1.csv test2.csv | cat -v
22,Charles,Stross,388^M,Stories,10/27/1983^M
33,William,Shakespeare,389^M,Plays,12/31/1980^M
44,Michael,Jackson,385^M,Music,7/23/1937
55,Tom,Green,103^M
58,Edgar,Poe,22^M
66,John,Doe,938^M
99,Jane,Doe,2388
0
 
LVL 84

Accepted Solution

by:
ozo earned 50 total points
ID: 33652098
So that's why the text is overlapping.
you may be able to remove it with
tr -d '\r'
0
 
LVL 2

Author Closing Comment

by:Proots
ID: 33653046
Ozo, you are a saint!
It works now; here is the entirety of what I had to do:

cat test1.csv | tr -d '\r' > testa.csv
cat test2.csv | tr -d '\r' > testb.csv
join -a 1 -t , testa.csv testb.csv
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article was originally published on Monitis Blog, you can check it here . If you have responsibility for software in production, I bet you’d like to know more about it. I don’t mean that you’d like an extra peek into the bowels of the sourc…
In this article I discuss my selections of the Top Four free Outlook OST File Viewers available. Open, view and read even damaged OST files by using these tools. They all provide a clear preview of all data such as emails, notes, tasks, calendars, e…
This video shows how use content aware, what it’s used for, and when to use it over other tools.
This video will demonstrate how to find the puppet warp tool from the edit menu and where to put the points to edit.

624 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question