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------- Original Message -------
On Tuesday, December 27th, 2022 at 2:10 PM, Rich Shepard
<rshep...@appl-ecosys.com> wrote:
> On Tue, 27 Dec 2022, Reid wrote:
>
> > You could try something like `diff --changed-group-format='%<'
> > --unchanged-group-format=''`, or one of its variants. That example assumes
> > that the first file is the one you want lines from. Check the diff man
> > page under "--GTYPE-group-format=GFMT".
>
>
> diff -y shows differences, but both files being compared. On the other hand
> (besides four fingers and a thum) there's comm:
>
> man comm:
> NAME
> comm - compare two sorted files line by line
>
> SYNOPSIS
> comm [OPTION]... FILE1 FILE2
>
> DESCRIPTION
> Compare sorted files FILE1 and FILE2 line by line.
>
> When FILE1 or FILE2 (not both) is -, read standard input.
>
> With no options, produce three-column output. Column one contains lines
> unique to
> FILE1, column two contains lines unique to FILE2, and column three contains
> lines
> common to both files.
>
> -1 suppress column 1 (lines unique to FILE1)
>
> -2 suppress column 2 (lines unique to FILE2)
>
> -3 suppress column 3 (lines that appear in both files)
>
> --check-order
>
> It's really handy and will do what Ben wants.
For comm, the files have to be sorted. Whether that matters depends on file
size.
>
> Rich
