How about...

cat file1 | perl -e 'while(<>){ next if !/IMO/; print $_;}'
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If the lines can only begin with IMO then:

cat file1 | perl -e 'while(<>){ next if !/\bIMO/; print $_;}'
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If case is not important then:

cat file1 | perl -e 'while(<>){ next if !/\bIMO/i; print $_;}'
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If you have multiple words to search for, then create another file named file2 and enter the search words:

vi file2
apple
orange
banana

grep -f file2 file1
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From the unix command-line... file2 is the list of words to search for from lines in file1... Note: you may have to run "dos2unix file2" to remove LF/CR or use chomp somehow...