Unit6. Text Processing Tools

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Unit6. Text Processing tool *******

1.diff (diff files differ)

diff file File1/* Compare two different files

-c/* Show surrounding rows

-u/* Generate patches according to the same output

-R/* Compare the different files in two directories

Patch file File.path/* Patching

-B/* Back up the original file

***2.grep Regular expression (the row where the keyword is intercepted )

grep Key Character File | directory/* Find rows in a file or directory that contain keywords

Grep-i/* Ignore case

-N/* Display keywords in the row

-C/* Displays the number of filtered results

-V/* Reverse Filter

-e "keyword 1| keyword 2"/* Filter Multiple keywords

-R Directory/* Find files containing keywords in directory

Note: The ^ keyword/* starts with a keyword

Keyword $/* ends with a keyword

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3.cut (used to cut or display text segments in a file)

Cut/* intercept characters

cut-d delimiter/* Specify delimiter

Cut-f 1,7/* Displays the specified columns

Cut-c 1-4/* Displays specified characters

Ifconfig eth0 | grep inet | grep inet6-v | Cut-d ""-F 10

Ifconfig eth0 | grep inet | grep inet6-v | Awk-f "" ' {print $} '

4.sort/* Sort

Sort

-N/* Pure numeric sorting

-u/* Go redundant

|UNIQ-C/* Remove redundancy and count redundancy times

-k/* Specify column

-t/* Specify delimiter

5.uniq

Sort file |uniq-c/* Remove redundancy and count redundancy count

-d/* Show redundant rows

-u/* Displays unique rows

6.sed

Sed ' s/original character/replacement character/g ' file

Sed-e ' Strategy 1 '-e ' policy 2 ' file

Sed-i File/* Enter the converted content into the specified files

Sed ' 3,5s/original character/replacement character/g ' file/*3-5 line conversion

SED xd/* Mask specified line

Sed XP/* Copy the specified line

Sed-n XP/* Displays only specified lines

Sed-ne xp-ne YP File/* Specify to replicate 3 and 52 rows

Sed-n 3,5p File/* Copy 3-5 rows

Example: Sed-e ' s/^\ *//g ' file-e ' s/\t/\/g '-I file/* Replace the file with a space and start with the TAB key

A script (match the password to the account) *************

#!/bin/bash

max=$ (Wc-l $ | cut-d ""-F 1)/* Statistics number of rows for user

For NUM in $ (seq $MAX)/* Loop MAX times

Do

username=$ (sed-n ${num}p)/* Copy First-line

passwd=$ (sed-n ${num}p)/* Copy First-line

Useradd $USERNAME/* User add

echo $PASSWD | passwd--stdin $USERNAME/* This option is used to read the new password from the standard input pipe

Done

Unit6. Text Processing Tools