题解 | #打印空行的行号#
第二列是否有重复
http://www.nowcoder.com/practice/61b79ffe88964c7ab7b98ae16dd76492
awk '
{
freqs[$2] += 1
}
END {
for (x in freqs) {
print(freqs[x], x)
}
}
' nowcoder.txt |
awk '
{
if ($1 > 1) {
print($0)
}
}
'