Test files
Copy Code code as follows:
[Root@bogon ~]# Cat >test
Jason
Jason
Jason
Fffff
Jason
Press CTR + D to save
1, Sort-u
Copy Code code as follows:
[Root@bogon ~]# sort-u Test
Fffff
Jason
2, Uniq
Copy Code code as follows:
[Root@bogon ~]# Uniq Test
Jason
Fffff
Jason
This shows that uniq need to be sorted before they can be heavy
3, sort, pipe and uniq combined use
Remove duplicates and keep a duplicate of the data
Copy Code code as follows:
[Root@bogon ~]# Sort Test|uniq
Fffff
Jason
Removes all duplicate rows (without retaining duplicate rows) and calculates the number of rows
Copy Code code as follows:
[Root@bogon ~]# Sort Test|uniq-uc
1 fffff
Finds all duplicate rows and calculates the number of rows
Copy Code code as follows:
[Root@bogon ~]# Sort TEST|UNIQ-DC
4 Jason
To weight according to a field
Change the original data to
Copy Code code as follows:
[Root@bogon ~]# more Test
Jason 1
Jason 2
Jason 1
FFFFF 2
Jason 3
[Root@bogon ~]# sort-k 1,1-u test
FFFFF 2
Jason 1
Man sort looks at the use of sort, which is described in the-K argument:
Copy Code code as follows:
-K,--key=pos1[,pos2]
Start a key at POS1 (Origin 1), end it at POS2 (default "line")
That is, k which columns are sorted, POS1 is the beginning column, Pos2 is the end column
