How to count the occurrences of a number?

I have a file, consisting of a column of numbers, some of which are the same, I want to count the occurrences of each unique number, here is the simple way:

cat filename | sort | uniq -c

Be sure that the numbers are in a column.

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原文地址：https://www.cnblogs.com/wujingcqu/p/4078413.html