grep AND/OR/NOT

grep PATTERN file

# AND — 파이프 연쇄
grep pat1 file | grep pat2

# AND — 순서 무관 (ERE)
grep -E 'pat1.*pat2|pat2.*pat1' file

# OR
grep -e pat1 -e pat2 file
grep -E 'pat1|pat2' file

# NOT
grep -v pat file