Re: a one-liner for this trivial problem?

[PrakashK]

perl -ne 'BEGIN {open my $sh, "<", shift; %h = map {$_ => 1} <$sh>} print unless $h{$_}' small large

Read the small file in the BEGIN block and shift it out of @ARGV.

A minor plus of this approach is that any number of "large" files can be passed, after the "small" file.

If you have File::Slurp available:

perl -MFile::Slurp=slurp -ne 'BEGIN {%h = map {$_ => 1} slurp shift} print unless $h{$_}' small large

[tbone654]

exclude smallfile from largefile

grep -i -v -f smallfile largefile

include only smallfile from largefile

grep -i -f smallfile largefile

include only smallfile from largefile in reverse order numberic by kolumn 2

grep -i -f smallfile largefile | sort -r -b -g -k 2