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how to combine 2 files by join

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# 1  
Old 04-27-2009
how to combine 2 files by join
i wanna combine 2 files that need to use join(need to use -a1 -a2) to produce a new file and also need to sort the new file in numerical order by ID.

The format of 2 files is:
Filename: Prac1
# Results for Prac1. The format is:
# 12345677 10
20693680 10
20179687 9
20781637 5
21907894 6

Filename: Prac2
# Results for Prac2. The format is:
# 12345677 10
20693680 8
20179687 6
21907894 2

also need to ignore the # in the file.

The format of the file produced by the 2 files is
20179687 9 8
20693680 10 8
20781637 5
21907894 6 2

Can anyone please help me with this question?
# 2  
Old 04-28-2009
You input files to join MUST be sorted by the key value in order for join to work.

Is that enough hint?
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