The linux Command counts the number of times the IP address of the log file appears.

The linux Command counts the number of times the IP address of the log file appears.

One interview question:

How many times does the log file IP value count? The first six most frequently displayed

Solution:

Grep-I-o-E "([0-9] {1, 3 }\.) {3} [0-9] {1, 3} "test1.txt | sort-n | uniq-c | sort-n? -R | head-6

Parameter Details:

Grep command for text search

-E: used for regular expression matching.

-O: only the matching part is displayed.

-I: case insensitive

The sort command is used for sorting

-N: Numerical sorting

-R: reverse sorting

Uniq command for deduplication

-C: displays the number of duplicates.

The head-6 command displays the first six lines