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Shell Programming and Scripting

COMM and Numerical Sorting

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# 1  
Old 02-26-2010
COMM and Numerical Sorting
Hi,

Hope someone can shed some light on this...
I have two lists of numbers I am comparing using COMM. If the first list is empty, and I sort both lists like so:
Code:
DIFF=`comm -3 <(echo "$EMPTY" | sort -n) <(echo "$NUMBERS" | sort -n)`

I get the error: comm: file 2 is not in sorted order

But if I drop the numerical sorting from sort:
Code:
DIFF=`comm -3 <(echo "$EMPTY" | sort) <(echo "$NUMBERS" |  sort)`

It works OK. Is there a bug or am I doing something wrong? I have dropped '-n', but I was just wondering if there is a good explanation for this.

Thanks.
Stephen
# 2  
Old 02-26-2010
Question
What is $EMPTY and $NUMBERS?
Do they hold filenames?
# 3  
Old 02-26-2010
Variables containing the lists. $EMPTY is an empty string.
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