On 2021-06-23 08:22, to...@tuxteam.de wrote:
On Wed, Jun 23, 2021 at 06:51:39AM +0300, Andrei POPESCU wrote:

[...]

comm -23 <(apt-mark showmanual | sort -u) <(gzip -dc /var/log/installer/initial-status.gz | sed -n 's/^Package: //p' | sort -u)

Command substitution without '$'? I must be missing something and would
appreciate a pointer.

As David pointed out (as a pointer), the <(...) is a bashism for
"pretend this is
a file name whose content is provided by the enclosed command's output".

Perhaps more readable in the symmetrical variant

  diff -u <(ls dir1) <(ls dir2)

Very handy.

does not the excellent guide also say not to try to do anything with the output of "ls" ?
mick

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