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. Cheers - t
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