sed - How can I emulate `uniq -d` in awk? -


i've got busybox system doesn't have uniq , i'd generate unique list of duplicated lines.

a plain uniq emulated in awk be:

sort <filename> | awk '!($0 in a){a[$0]; print}'

how can use awk (or sed matter, not perl) accomplish:

sort <filename> | uniq -d

could (needn't sort it):

awk '{++a[$0]; if(a[$0] == 2) print}'

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