How to sort a file by a column in the file in unix?
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-n : Makes the program sort according to numerical value.
-k opts: Sort data / fields using the given column number. For example, the option -k 2 made the program sort using the second. column of data. The option -k 3,3n -k 4,4n sorts each column. First. it will sort 3rd column and then 4th column.
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