Re: Checking for new files

Sort the two lists and compare with comm:

$ cat a
one
two
three
four
five
six
seven
$ cat b
two
four
five
six
seven
$ sort a > a.sorted
$ sort b > b.sorted
$ comm -23 a.sorted b.sorted
one
three
$
[download]

Update 2009 sep 2.

See Re^2: Joining two files on common field for a list of other nodes where unix textutils is suggested to merge files.

Comment on Re: Checking for new files Download Code

Replies are listed 'Best First'.
Re^2: Checking for new files by kelan (Deacon) on Jan 28, 2005 at 14:56 UTC
Use zsh! :) `$ comm -23 <(sort a) <(sort b)` [download]	[reply] [d/l]
Re^3: Checking for new files by ambrus (Abbot) on Jan 28, 2005 at 15:02 UTC
That works in bash too, and I'd use that too; but it's not as portable so I didn't write it here. Compare Re: comparing arrays and Re: help with lists.	[reply]

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