invert regular expression

grep is known as one of the Three Musketeers of the text processing, although the Three Musketeers is the least functional and the simplest, but still can not be underestimated.The full name of grep is: Global search REgular expression and Print out

grep egrep usage and its corresponding regular expressionOne, grep, Egrep commandIn this paper, the basic parameters and the usage format and methods of grep egrep fgrep command and regular expression in Linux system are mainly introduced.Definition

Multiple Command execution methods:Script composition;1.shengbang2.#3. Blank lines-lines with no content, only white space characters or tabs (tab)4. Logical JudgmentShell script Programming:1. Execute permission to invoke the script through the

grep sed awk is called the text-processing Three Musketeers, this article mainly about grep.Grep:global search Regular Expression and Print out of the lineThe global search is performed using regular expressions and the matching rows are

Regular Expressions: Regular expression, REGEXDivided into two categories:Basic Regular Expressions: BREExtended Regular expression: EREgrep family:Grep:global search REgular expression and Print out of the line. Supports the use of basic regular

A regular expression: a regular expression (or regular expression, called re) is a text pattern consisting of ordinary characters (such as characters A through Z) and special characters (called metacharacters). This pattern describes one or more

Grep Regular Expression A regular expression is a symbolic representation used to recognize text patterns. In Linux, the main program for processing regular expressions is grep. Grep searches for the rows matching the Regular Expression and delivers

grep command and regular expressiongrep commandgrep, Egrep, FgrepGrep,sed,awk Text Processing Three MusketeersGrep:global search REgular expression and Print out of the line; finds the regular expression and displays the matching rows;Regular

A regular expression is a symbolic representation that is used to identify text patterns. The main program for Linux to process regular expressions is grep. grep searches for rows that match regular expressions and transports the results to standard

Application background: We just added a user Luffy, but we don't know what its default shell is. Q: How do I retrieve a user's default shell? Solution: # Grep '^ Luffy \>'/etc/passwd | cut-D:-F7 /Bin/bashf Through the above method, we get the