awk '{print $4}' nowcoder.txt|
awk -F: '{print $2":"$3}'|
awk '{a[$0]++}END{for(k in a) print a[k],k}'|
sort -k 1 -r
awk '{print $4}' nowcoder.txt|
awk -F: '{print $2":"$3}'|
awk '{a[$0]++}END{for(k in a) print a[k],k}'|
sort -k 1 -r