The sort command can also merge already sorted files and check whether a file is sorted or not.
sort 命令还可以合并已经排序的文件，并检查某个文件是否已经排序。
2
The uniq command normally operates on sorted files, and removes consecutive identical lines from any file, whether sorted or not.
uniq 命令通常操作已排序的文件，并从文件（不管是否排序）中删除连续的相同行。
3
This historical data can be sorted and exported as a comma-separated value (CSV) file, which enables the data to be imported into spreadsheets and other applications.