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cat file1 | perl -e 'while(<>){ next if !/IMO/; print $_;}'

cat file1 | perl -e 'while(<>){ next if !/\bIMO/; print $_;}'

cat file1 | perl -e 'while(<>){ next if !/\bIMO/i; print $_;}'

vi file2
apple
...
banana

grep -f file2 file1