Linux shell command

(1) Manipulating a file and slicing the file query rows

　　

grep ' XXX ' Cut 2 (or 1-2)

(2) The operation of the file to remove the weight and show the number of repetitions

grep ' xxx ' Cut 2 Sort Uniq -C

(3) View total number of totals rows

grep ' XXX ' Cut 2 Sort Uniq WC -L

Sort : sorts the contents of the text file.

sort-u [File] = sort [File] | Uniq (de-weight)

Parameter description

-B ignores whitespace characters that begin before each line

-c Check that the files are sorted in order

-D sorting, ignoring other characters, in the case of English letters, numbers, and whitespace characters

-f Sort, lowercase letters are considered uppercase

-L when sorting, ignoring other characters except ASCII characters between 040 and 176

-M merges several sorted files

-M sorts the preceding 3 characters according to the abbreviation of the month

-n Sort by numeric size

-o< output File > Tell the sorted result into the specified file

-R sorted in reverse order

-t< separator character > Specify the field segment character to use when sorting

+< start >-< End fields > Sort by a specified field, ranging from the start to the previous field in the End field

--HELP Display Help

--version displaying version information

-U leaves only one row for rows that are considered identical after sorting

Uniq: checks and deletes duplicate rows in a text file.

syntax : uniq[options] File

most important parameters : Default (de-weight) |   -D (display weight) | -U (delete weight)

Parameters

-C or--count shows the number of occurrences of the row next to each column

-D or--repeat displays only the rows that appear repeatedly

-f< field > or--skip-fields=< column > ignore compare specified field

-s< character position > or--skip-chars=< character position > Ignore comparison of specified characters

-U or--unique only show one row at a time

-w< character position > or--check-chars< character position > Specifies the character to compare

--help Help Information

--version Version Information

Linux shell command