On Tue, 2013-05-14 at 09:56 +0100, Frank Murphy wrote:
> Having looked at "man join" wasn't sure of it's use here.
'join' is more like a database table join (think of two tables being
joined horizontally).
> Unknown number of files, constant is extension .list
> (For testing purposes only using two)
>
> cat *.list >> output.joined | sort -u
That's almost certainly not what you want:
1) You probably want '>' rather than '>>' if you're only running this
once. Not that it makes a difference here but it's superfluous.
2) Since you're sending the output of 'cat' to a file, the pipe won't
get any input, so you're you sorting nothing. If you actually want to
capture the output in a file, you can use 'tee':
sort *.list | tee output | sort -u
or just run the two commands separately:
cat *.list > output
sort -u < output
If not, then "cat *.list|sort -u" is enough.
poc
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