The role of *grep-f/f *

(1.) grep-f yourstring-r Path

Function: Search for strings in documents with grep

[Root@sor_sys hahah]# grep-f 0576-r/root/zy/hahah
/root/zy/hahah/b:05766798607
/root/zy/hahah/b:05766798608
/root/zy/hahah/b:05766798609
/root/zy/hahah/a:05766798608

(2.) grep-v-F file1 file2

Function: Outputs the contents of file 2, but rejects the content contained in file 1

Let's look at an application:

[Root@sor_sys hahah]# Cat A
1
4
05766798608
05766798608
6
7
[Root@sor_sys hahah]# Cat B
05766798607
05766798608
05766798609
[Root@sor_sys hahah]# grep-v-F B a |tee 222 | Wc-l
4
[Root@sor_sys hahah]# Cat 222
1
4
6
7

PS:

Tee Syntax: Tee [-a] [-i] [File ...]
Function: equivalent to echo plus >, the standard input output to the standard input and write to the file

-A: (add) does not overwrite the original content, added to the back of the file

-I: (ignore) is not interrupted if not completed

Lists the contents of the text file Slayers.story, and copies 3 copies, with the file names Ss-copy1, Ss-copy2, Ss-copy3, respectively:

Cat slayers.story |tee ss-copy1 ss-copy2 ss-copy3

(3.) grep-f-F file1 file2

function: You can output the line of file 1 in file 2

But I did an experiment, and if there are no duplicate rows in file 1, the result is correct. If there are duplicate rows, the result is the same as a row with no duplicates.

I want to achieve the goal is that the file 1 put the mobile phone number of the first 7, file 2 put the mobile phone number of the first 7 and the provinces represented, output and then statistics file 1 each province has the number of mobile phone numbers.

[Root@sor_sys hahah]# Cat File1
11111
22222
11111
22222
33333
44444
55555
[Root@sor_sys hahah]# Cat File2
11111 BJ
22222 HB
33333 HN
44444 NM
55555 XM
66666 MK

[Root@sor_sys hahah]# grep-f-F file1 file2
11111 BJ
22222 HB
33333 HN
44444 NM
55555 XM
[Root@sor_sys hahah]#

It seems that this is not possible, there are 2 in the File1 11111 and 2 22222, that is, if the file1 has duplicate rows, also repeat the output.

[Root@sor_sys hahah]# join-1 2-2 1 < (sort file1|uniq-c) < (sort file2)
11111 2 BJ
22222 2 HB
33333 1 HN
44444 1 NM
55555 1 XM