09-25-2008
I might be crazy but...
You show two examples of expected results in your post. I am kind of confused as to which you are looking for. Your first expected output shows two files side by side and the second one shows the output being only what is the same in the file.
But by reading the whole thing it appears that your end goal is to add file2's unique contents to file1, making one file with all of the content. But there are a few assumptions here that I think may hurt you, but before I get into those we need to know the goal.
I am not trying to bash you at all, if you just learned scripting and are already into sed and awk you are way ahead of where I was at 2 weeks, but what exactly are you looking for?
Last edited by ctruhn; 09-25-2008 at 08:42 PM..
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JOIN(1) General Commands Manual JOIN(1)
NAME
join - relational database operator
SYNOPSIS
join [ options ] file1 file2
DESCRIPTION
Join forms, on the standard output, a join of the two relations specified by the lines of file1 and file2. If file1 is `-', the standard
input is used.
File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the first in
each line.
There is one line in the output for each pair of lines in file1 and file2 that have identical join fields. The output line normally con-
sists of the common field, then the rest of the line from file1, then the rest of the line from file2.
Fields are normally separated by blank, tab or newline. In this case, multiple separators count as one, and leading separators are dis-
carded.
These options are recognized:
-an In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2.
-e s Replace empty output fields by string s.
-jn m Join on the mth field of file n. If n is missing, use the mth field in each file.
-o list
Each output line comprises the fields specifed in list, each element of which has the form n.m, where n is a file number and m is a
field number.
-tc Use character c as a separator (tab character). Every appearance of c in a line is significant.
SEE ALSO
sort(1), comm(1), awk(1)
BUGS
With default field separation, the collating sequence is that of sort -b; with -t, the sequence is that of a plain sort.
The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous.
JOIN(1)