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Cygwin / Bash - Join command not working as expected

Posted on 2010-09-10
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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?  
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Question by:Proots
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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
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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
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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'
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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
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