Linux Learning note 033_8 Text processing

Less

One display can be up (n), page Down (n), and you can find:/keyword,v into the editor

Cat

Display text content at once

More

Carriage return down one line, space down a page, but cannot page up

nl

Show output of line numbers

Head

Show the first 10 lines of a file

Head-n A:

Show first 15 lines of file a

Tail

Show the last 10 lines of a file

Tail-n A:

Show the following 15 lines of file a

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/46/2E/wKiom1PuCV6AgXZzAAAibZZBU3s431.jpg "title=" Clipboard1.png "alt=" Wkiom1pucv6agxzzaaaibzzbu3s431.jpg "/>: View the last 10 lines of the log

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/46/2E/wKiom1PuCYaAKvxtAAAhqVq8r1U069.jpg "title=" Clipboard2.png "alt=" Wkiom1pucyaakvxtaaahqvq8r1u069.jpg "/>: real-time display of the last 10 rows, if no-f is static

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/46/30/wKioL1PuCqzCzqrIAAAg10rFJCM641.jpg "title=" 3.jpg " alt= "Wkiol1pucqzczqriaaag10rfjcm641.jpg"/>: Extract 11 to 20 rows saved in file

grep: (Regular expression)

Filter keywords in behavioral units

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/46/30/wKioL1PuCt2xPHg4AAAtYEgbCZE075.jpg "title=" Clipboard4.png "alt=" Wkiol1puct2xphg4aaatyegbcze075.jpg "/>: Find keywords in file passwd redhat and print this line of keywords with color on the keyword

Date--help |grep--color=auto Year: Find the Year keyword in Help for date

-I: Ignore case

-N: Filter out which line in the file

-V: Direction selection

-A x: Displays the following X-lines of rows that match the filter

-B x: Displays the first x rows of the row that matched the filter (contact context)

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/46/30/wKioL1PuCxPBgWI3AAAlgOb2u_Q521.jpg "title=" Clipboarda.png "alt=" Wkiol1pucxpbgwi3aaalgob2u_q521.jpg "/>: Find out which path Ip_forward is under

-r: Recursive query directory

Cut

Filter by column as unit

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/46/2E/wKiom1PuCt7TEmVtAAAnIViTOmw494.jpg "title=" Clipboard5.png "alt=" Wkiom1puct7temvtaaanivitomw494.jpg "/>: Filter out the first column for delimiters, this command shows all users, if-f1-3 is first to third column, if is-d ' is separated by an irregular number of spaces in the middle,-c2-5: the 2nd to 5th character

Top

Show process

235/60 R17 Maxxis

WC: (Word count)

Word count: WC a.txt

-L: Show only the number of rows

-W: Displays only the number of words

-C: Show only the number of bytes

-M: Shows the number of bytes (not shown by default)

Sort

Sort (default ascending)

-R: Descending sort

-t:650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/46/2E/wKiom1PuCw6jR7QuAAAhtP52iuM326.jpg "title=" Clipboard6.png "alt=" Wkiom1pucw6jr7quaaahtp52ium326.jpg "/>: Sort by a colon-separated third column

-N: Sort by number, sort by character by default

-F: Ignore case difference sort, default lowercase in front of uppercase

-U: If two rows are sorted and parallel then the duplicate is removed (unique), equivalent to | Uniq-c

Diff:

Compare the differences between two articles

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/46/30/wKioL1PuDDuDTly-AABYtbZA6Fg159.jpg "title=" Clipboard7.png "alt=" Wkiol1puddudtly-aabytbza6fg159.jpg "/>

Patch

Patching: Essentially compare the old and new two files, generate a patch file, hit on the file

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/46/30/wKioL1PuDNeBixPSAACx-E6ycxk960.jpg "title=" Clipboard8.png "alt=" Wkiol1pudnebixpsaacx-e6ycxk960.jpg "/>

-U is to output new and old files without adding some syntax, generate patch files, no-U is normal file

-B Backup long files for patching

Aspell

Grammar check

Aspell List < A.txt |wc-l

Tr:

Case conversion: TR ' A-Z ' A-Z ' <a.txt: uppercase converted to lowercase

Sed:

Find and replace

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/46/30/wKioL1PuDOeTQ5pgAAAUV2tBuNg039.jpg "title=" Clipboard9.png "alt=" wkiol1pudoetq5pgaaauv2tbung039.jpg "/>:s for Find, G for all, find dog and replace all to cat, if no G replaces only the first keyword, pers is the file name

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/46/30/wKioL1PuDTegrDy_AAAXNV8rV6g898.jpg "title=" Clipboard10.png "alt=" Wkiol1pudtegrdy_aaaxnv8rv6g898.jpg "/>: Replace only 1~50 rows

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/46/2E/wKiom1PuDLvQNCfYAAAlPhe_vkg020.jpg "title=" Clipboard11.png "alt=" Wkiom1pudlvqncfyaaalphe_vkg020.jpg "/>: Replace with dibgy beginning with the middle dog in Duncan end to Cat

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/46/30/wKioL1PuDd7z8U98AAAdyBDFns0876.jpg "title=" Clipboard12.png "alt=" Wkiol1pudd7z8u98aaadybdfns0876.jpg "/>: Simultaneous two find replacements

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/46/2E/wKiom1PuDM-yHDAoAAAStrSykkM004.jpg "title=" Clipboard13.png "alt=" Wkiom1pudm-yhdaoaaastrsykkm004.jpg "/>: Writes the find and replace operation in the Myedits file, myedits content: s/dot/cat/g

This article is from the "FLYCLC" blog, make sure to keep this source http://flyclc.blog.51cto.com/1385758/1540841