Shell Script Learning Summary----sed+grep+awk+ Regular

Shell Script Learning Summary----sed+grep+awk+ Regular

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First part SED

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I. INTRODUCTION of SED

SED is the stream editor. He is an indispensable tool in text processing, used in conjunction with regular expressions, the magic of the infinite! 650) this.width=650; "src=" Http://img.baidu.com/hi/face/i_f07.gif "alt=" I_f07.gif "/>

Second, the command parameters

-N prints only changed rows

-I modify source file

-E

G Full line substitution

Ng the current row matches to the nth start substitution

Iii. examples

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Part Two awk

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Part Three grep

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First, grep introduction

The grep command is a text-search command on a Linux system that accepts regular expressions and produces a variety of outputs.

Second, grep command parameters

-I ignores case

-E Matching Regular

-V Take reverse

-N Generate line number

-C matches the number of successful rows

-L can search multiple text at the same time

-r-r Implementing Recursive Search

-E

--include

--exclude

--color=auto matches to a color display

Iii. examples

1. Echo ABCB abc abc abc|xargs-n 1|GREP-I ABC

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Part IV-Regular expressions

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This article from "Doublelinux" blog, declined reprint!

Shell Script Learning Summary----sed+grep+awk+ Regular