File comparision

[gunnerjoe]

Hi All,

Hope someone can point me in the right direction.

If you have two text files, we will call them

fileA.txt
fileB.txt

fileA.txt contains a list of usernames that have logged into Apache web server on any given day and the list is small say 5 user names or so.

fileB.txt contains the full list of users authorized to login to Apache web server, say 25 usernames.

What I would like to know, does any user in fileA.txt not exist in fileB.txt and I'm not sure how to do that.

Any ideas greatly appriciated.

Thanks,

Joe

[tpl]

well, if you sort both files, then you can use "diff" to show where
they differ: something like this

sort fileA.txt >a
sort fileB.txt >b
diff a b

anything after '<' is unique to file a, i.e. to one.txt

[Franklin52]

How about:

grep -vf fileA.txt fileB.txt

[gunnerjoe]

Hi All,

Just to post an answer to the problem below:

'comm -23 fileA.txt fileB.txt'

The output will report the uniq username'(s) and nothing else.

Thanks,

Joe



=============================================
If you have two text files, we will call them

fileA.txt
fileB.txt

fileA.txt contains a list of usernames that have logged into Apache web server on any given day and the list is small say 5 user names or so.

fileB.txt contains the full list of users authorized to login to Apache web server, say 25 usernames.

What I would like to know, does any user in fileA.txt not exist in fileB.txt and I'm not sure how to do that.
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