Linux Comm Command to find the intersection of the file, the difference set

A () and B (3,4,5), the intersection of A and B is that the difference of 3,a to B is 1 and the difference of 2,b to A is 4 and the result of the difference between 5,a and B is 1, 2, 4, 5.

You can use the Comm command to find these sets in Linux.

cat <<eof>set1.txt> orange> gold> Apple>  Sliver> steel> iron> EOF

cat <<eof>set2.txt> orange> gold> cookiee>  Carrot> EOF

Use the Comm command.

[email protected] tmp]# Comm set1.txt set2.txtapple                 file 1 inch  file2 in sorted order                Gold        Cookiee        Carrotsilversteeliron

The hints are not sorted, so the Comm must ensure that the compared files are ordered.

sort Set1.txt-o set1.txt; sort Set2.txt-o set2.txt

[Email protected] tmp]# Comm set1.txt set2.txt                             Apple        carrot        cookiee                goldiron                orangesilversteel

3 columns are output in the results, and each column is separated with a tab \ t. The first column is Set1.txt and Set2.txt, the second column is set2.txt and Set1.txt does not, and the third column is Set1.txt and Set2.txt.

The intersection, the difference set and the difference can be obtained according to the three columns.

The intersection is the third column. Use 1 and 2 to delete the first second column is the result of the third column.

[Email protected] tmp]# Comm set1.txt set2.txt-1 -2goldorange

The difference set of a to B is the first column, and the difference between B and A is the second column.

[Email protected] tmp]# Comm set1.txt set2.txt  -2 -3  # A to B difference set Appleironsilversteel

[Email protected] tmp]# Comm set1.txt set2.txt  -1 -3   # b difference set for a carrotcookiee

The difference between A and B is the combination of the first and second columns.

[Email protected] tmp]# Comm set1.txt set2.txt  -3  Apple        Carrot        Cookieeironsilversteel

However, the results of the two columns are not easy to view and should be processed so that they appear on the same column.

[[Email protected] tmp]# Comm set1.txt set2.txt  -3tr"\ t""  / " Applecarrotcookieeironsilversteel

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Linux Comm Command to find the intersection of the file, the difference set