linux grep regular expression

:]]\{1,3\}. [[:d igit:]]\{1,3\}. [[:d igit:]]\{1,3\}. [[:d igit:]]\{1,3\}\b]-o10.1.70.102127.0.0.1192.168.122.12. Find out the maximum percentage value of partition space utilization[[email protected] ~]# df |tr-s ' |cut-d '-f5|egrep-o ' [0-9]{1,2} ' |sort-nr|head-1383, identify the user UID maximum user name, UID and shell type[[email protected] ~]# sort-nr-t:-k3/etc/passwd|head-1|cut-d:-f1,3,7nfsnobody:65534:/sbin/nologin4. Find out the permissions of/tmp and display them digitally[Email prote

As with the MySQL comprehensive optimization detailed in the previous writing, it is because such tools are widely used, so a comprehensive optimization strategy for such tools is a good deal, because whether you're a programmer in PHP, Perl, Python, C + +, C #, Java, and so on, You are very likely to use a tool such as MySQL, regular expressions. Let's say something you may not know. Knowledge of regular

Grep, egrep, and fgrep for basic regular expressions and text processing tools Grep (Global Search Regular Expression and print out the line global search Regular Expression and print o

linux grep command1. RoleThe grep command in a Linux system is a powerful text search tool that uses regular expressions to search for text and print matching lines. The grep full name is global

Linux grep command2. UseThe grep command in a Linux system is a powerful text search tool that uses regular expressions to search for text and print matching lines. The grep full name is global

1. grep (1) grep Introduction Grep: global search Regular Expression and print out the line. Global Search for regular expressions and output suitable rows. Grep is a powerful text

,} ' cannot match ' o ' in ' Bob ', but can match all o in ' Foooood '. ' O{1,} ' is equivalent to ' o+ '. ' O{0,} ' is equivalent to ' o* '.{n,m} m and n are non-negative integers, where n ? When the character immediately follows any other restriction (*, +,?, {n}, {n,}, {n,m}), the matching pattern is non-greedy. The non-greedy pattern matches the searched string as little as possible, while the default greedy pattern matches as many of the searched strings as possible. For example, for the st

From: http://www.cnblogs.com/end/archive/2012/02/21/2360965.html1. RoleThe grep command in a Linux system is a powerful text search tool that uses regular expressions to search for text and print matching lines. The grep full name is global Regular

2. UseThe grep command in a Linux system is a powerful text search tool that uses regular expressions to search for text and print matching lines. The grep full name is global Regular expression Print, which represents the globall

"mode" to match the target text line by row to check, print the matching line;Patterns: Filter conditions written by regular expression characters and text charactersREGEXP：由一类特殊字符及文本字符所编写的模式，其中有些字符不表示字符字面意义，而表示控制或通配的功能；分两类：基本正则表达式：BRE扩展正则表达式：ERE grep -E，egrepRegular expression enginegrep [options] pattern [file ..

Regular Expression to quickly adjust grep Regular Expression: It is composed of a bunch of metacharacters. These metacharacters are combined according to certain rules to filter and match different contents. (In short, a regular

Shell scripts are the core of Linux, while regular expressions are the core of shell scripts. Understanding regular expressions can quickly match the content to be searched, lay a solid foundation for future shell script programming. The contact regular expression generally

This article describes the Linux grep command, as follows: 1. Role The grep command in a Linux system is a powerful text search tool that uses regular expressions to search for text and print matching rows. The grep full name is

symbol \e ESCAPE, jump key \ ' In double quotes, use only single quotation marks \ "Double quotation marks \ \ \" Question mark character ========================================================================================#什么是正则表达式 #1: Regular expressions are a set of rules and methods that are defined to handle a large number of strings2: With the aid of these special symbols defined, the system administrator can quickly filter, replace and

PHP regular expression full manual, regular expression full manual Php regular expression full manual Preface Regular Expressions are cumbersome, but they are powerful. The application

2. UseThe grep command in a Linux system is a powerful text search tool that uses regular expressions to search for text and print matching lines. The grep full name is global Regular expression Print, which represents the globall

Linux grep command2. UseThe grep command in a Linux system is a powerful text search tool that uses regular expressions to search for text and print matching lines. The grep full name is global

1. RoleThe grep command in a Linux system is a powerful text search tool that uses regular expressions to search for text and print matching lines. The grep full name is global Regular expression Print, which represents the global

1. RoleThe grep command in a Linux system is a powerful text search tool that uses regular expressions to search for text and print matching lines. grep full name is global Regular ExprEssion Print, which represents the global

The grep commandin The Three Musketeers is often used in Linux operations, and the grep command searches for text files, which are performed in the unit of behavior to search for rows in the specified matching pattern. the grep command does some simple work without using a regular