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lang-c
$4 == pattern, although it would possibly be quicker with a singlejoincommand (no looping).$4 ~ "^"pattern"$"if pattern is actually a regexp and not a fixed string. i.e. normal awk string concatenation. so$4 ~ "^" pattern "$"works just as well and is, perhaps, slightly more readable.'$1 ~ "pattern" {print $0}'seems to do an exact match (in this case a different var, $1). I would be careful though given the difference between AWK versions and flavours.