这将为您提供重复的代码

This will give you the duplicated codes

awk -F, 'a[$5]++{print $5}'

如果您只对重复代码的计数感兴趣

if you're only interested in count of duplicate codes

awk -F, 'a[$5]++{count++} END{print count}'

要打印重复的行，请尝试

To print duplicated rows try this

awk -F, '$5 in a{print a[$5]; print} {a[$5]=$0}'