Text file commands (Wc,cut,sort,uniq) and common parameters

WC Word Count

WC [OPTION] ... [FILE] ...

-L,--lines shows the number of rows

-W,--words displays the number of words

-C,--bytes shows the number of bytes

- L,--max-line-length prints the length of the longest line.

eg

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Cut file Extraction command

Official explanation: Remove sections from all line of files

Select a section from each line in the file

According to the official explanation, you know that cut is the object of every action.

Usage: Cut OPTION ... [FILE] ...

Common parameters: (Other parameters please refer to the command manual: Man cut)

-d ', indicating the separator

-F, indicating the field to keep;

-f#:

Single: #

Discrete multiple: #,#,#

Number of consecutive: #-#

eg:1, only displays the UID, GID of the user in the/etc/passwd

#head/etc/passwd | Cut-d:-f1,3,4

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2. List the user names of all logged-in users on the current system;

Note: The same user logged in multiple times, only one time can be displayed;

#:who|cut-d '-f1|sort-u

Sort is a command that sorts a text file (by default, sorted by character)

Official explanation: Sort lines of the text files

--Distinguish lines of text files

Sort is also the object that is handled by the behavior

Usage:sort [OPTION] ... [FILE] ...

Common parameters:

-R: Reverse order:

-F: Ignores character case;

-T: Specify field Delimiter

-K: Choose which interval to sort by

-N: Numeric size sorting

-U: Go back to "focus" after sorting

Eg:1, sort/etc/passwd by uid size

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2. The/etc/passwd file is sorted by UID size, and only the user name and UID number are displayed

SORT-T:-k3-n/etc/passwd |cut-d:-f3,1

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Uniq: Go to the heavy command

Official explanation: report or omit repeated lines

--- to display or delete duplicate rows

Common parameters:

-I: Ignore case

-D: Show only duplicate rows

-u: Show only rows that appear once

-C: Displays the number of occurrences of each row after the reset

eg

Create a Aa.txt file, and then sort the file in descending order by the number of repetitions

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# sort A.txt | uniq-c | SORT-R-N//After the file has been de-weighed, descending by the number of occurrences

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/5B/EA/wKiom1UWEnfR9YpPAABoD4RXUQw160.jpg "title=" Uniq. JPG "alt=" wkiom1uwenfr9yppaabod4rxuqw160.jpg "/>

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File de-weight method:

1, sort-u File to go heavy

2. Uniq File

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This article is from the "impermanence" blog, please be sure to keep this source http://1inux.blog.51cto.com/10037358/1625911

Text file commands (Wc,cut,sort,uniq) and common parameters