A Note on Grep
Match pattern1 AND pattern2, but NOT pattern3
ordered:
$ grep -E ‘pattern1.*pattern2’ filename | grep -Ev ‘pattern3’
unordered:
$ grep -E ‘pattern1’ filename | grep -E ‘pattern2’ | grep -Ev ‘pattern3’
Match pattern1 OR pattern2, but NOT pattern3 in the same line:
$ grep -E ‘pattern1|pattern2’ filename | grep -Ev ‘pattern3’
grep -E = egrep = match everwhere