Chapter 5 grep and regular expression of three swordsmen in Linux text processing

3. Text processing three swordsmen The grep command mainly filters the (regular expression) lines of text based on patternssed: stream editor, text editing toolawk: implementation gawk on Linux, text report generator 3.1 grep of three swordsmen in text processing grep: Global search REgular expression and Print out the line Function: a text ...

Posted on Thu, 14 Oct 2021 19:50:43 -0400 by Neotropic

shell script learning

12, Regular expression 1. Introduction to regular expressions Regular expressions are a form of text pattern matching, including ordinary characters (for example, letters between a and z) and special characters (called "metacharacters"). It is a pattern of string matching, which can be used to check whether a string contains a subst ...

Posted on Tue, 28 Sep 2021 06:47:08 -0400 by rross46

SHELL script - text three swordsman

SHELL script - text three swordsman grep Common options optiondescribesupplement-EExtended regular (ERE)–extended–regexp-PBuilt in regularPerl-iignore case–ignore–case-nPrint line number–line–number-oPrint only matching content–only–matching-cPrint only the number of lines that match each file–count-BPrint the first few lines that match–befo ...

Posted on Mon, 20 Sep 2021 20:54:24 -0400 by dapuxter

Programming Three Swordsmen (grep, sed, awk) in the regular expression of shell

sed editor 1. sed concept sed is a stream editor that edits a stream based on a set of pre-provided rules before the editor processes the data. The sed editor can process data in a data stream based on commands that are either entered from the command line or stored in a command text file. 2. sed's Workflow sed's workflow mainly consist ...

Posted on Tue, 14 Sep 2021 12:09:42 -0400 by varun8211

Advanced JavaScript Chapter 11 (regular expressions) (end)

Understand the role of regular expressions Master the use of regular expressions Create regular expressions Regular expression composition Boundary character Character class Regular test Regular expression overview 1. What is a regular expression Regular Expression is a pattern used to match character combinations in a string. In ...

Posted on Sun, 05 Sep 2021 02:55:54 -0400 by moneytree