Need help with comm command


 
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# 1  
Need help with comm command

Hello , I am trying to get contents which are only present in a.csv ,so using comm -23

Code:
cat a.csv | sort > a.csv
cat b.csv | sort > b.csv
comm -23 a.csv b.csv > c.csv.

Code:
a.csv
SKU     COUNTRY     CURRENCY     PRICE_LIST_TYPE     LIST_PRICE_EFFECTIVE_DATE
TG430ZA    ZA    USD    DF    2012-03-28    9999-12-31    120000    
TG431ZA    ZA    USD    DF    2012-03-28    9999-12-31    96000    
TG432ZA    ZA    USD    DF    2012-03-28    9999-12-31    1200    
TG433ZA    ZA    USD    DF    2012-03-28    9999-12-31    12000

Code:
b.csv 
SKU     COUNTRY     CURRENCY     PRICE_LIST_TYPE     LIST_PRICE_EFFECTIVE_DATE  
TG431ZA    ZA    USD    DF    2012-03-28    9999-12-31    96000    
TG432ZA    ZA    USD    DF    2012-03-28    9999-12-31    1200    
TG433ZA    ZA    USD    DF    2012-03-28    9999-12-31    12000

When I run the script , expected result is (2nd line of a.csv TG430ZA is not present in b.csv)
Code:
TG430ZA    ZA    USD    DF    2012-03-28    9999-12-31    120000

but I am getting
Code:
SKU     COUNTRY     CURRENCY     PRICE_LIST_TYPE     LIST_PRICE_EFFECTIVE_DATE
TG430ZA    ZA    USD    DF    2012-03-28    9999-12-31    120000

Can any help me on this please. I have tried using comm -2 -3 also ..its same

Last edited by methyl; 07-10-2012 at 07:38 AM.. Reason: Please use code tags.
# 2  
There's probably some difference between the headers. Perhaps a carriage return, or an extra space or tab somewhere? Take a close look with od, hd, hexdump, or sed -n l.

Regards,
Alister
# 3  
I copied exact same line from a.csv into b.csv
SKU COUNTRY CURRENCY PRICE_LIST_TYPE LIST_PRICE_EFFECTIVE_DATE

without any spacing errors , but output is same ... I do not understand why comm is unable to comprehend this line . Have been on this issue for a lot of time Smilie
# 4  
Did you take a look at it with one of the tools I suggested? If not, do so. If you do not know how to interpret their output, post it here (and make sure to use code tags to preserve the formatting).

Regards,
Alister
This User Gave Thanks to alister For This Post:
# 5  
Hello alister ,

Thank you . I got the mistake , there is a blank space appended at the end of first line . Thanks a lot for the help .
 

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