• The usage of awk print in shell


    First, you need to understand how awk works1。 Awk reads the input file one line at a time.2。 For each row, it matches the pattern in the given order, and if it does, performs the corresponding action.3。 If there is no pattern matching, any action will be performed.4。 In the above syntax, either search mode […]

  • Explain awk command in Linux


    brief introduction Awk is a powerful tool for text analysis. Compared with grep search and sed editing, awk is particularly powerful in data analysis and report generation. In short, awk is to read the file line by line, slice each line with space as the default separator, and then conduct various analysis and processing on […]

  • Awk extracts a paragraph containing a keyword in Linux


    premise Awk is a language for processing text files and a powerful tool for text analysis. This article will use the command awk to extract the paragraph with a certain keyword. Prepare the data “Finalizer” #3 daemon prio=8 os_prio=0 tid=0x00007fb2dc1aa800 nid=0x63f6 in Object.wait() [0x00007fb2be61f000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) – waiting on […]

  • Using loops in awk


    Let’s learn about different types of loops that execute the same command multiple times. The awk script has three main parts: begin and end functions (both optional), and the user writes the function to execute each time. In a way, the main body of awk is a loop, because the commands in the function execute […]

  • Awk command line or script to help you sort text files (recommended)


    Awk is a powerful tool for performing certain tasks that may be done by other common utilities, including sort. Awk is a ubiquitous UNIX command that scans and processes text that contains predictable patterns. However, because of its function function, it can also be reasonably called programming language. Puzzling is that there is more than […]

  • Summarize the use of awk, SED, grep commands for text processing in Linux


    awkBasic conceptsAwk regards the file (or other input streams, such as redirected input) as a recordset, each line as a record, and the string separated by a space (or a separator specified by the user) in each line as a field. This seems to regard the file record as a database. However, Awk is still […]

  • Detailed explanation of the usage of SED and awk in Linux


    Sed usage: Sed is a very good file processing tool. It is a pipeline command. It is mainly processed in behavioral units. You can replace, delete, add, select data lines and other specific work. Let’s learn about the use of SED first The SED command line format is: Sed [- nefri] ‘command’ enter text Common […]

  • Thinking about a timing task configuration error


    background A business person said that the system could not log in, so the programmer tried to log in the system successfully. He was confident that “my code is OK”, so he asked the business person to try again. Then the business personnel is landed successfully, but is too laggy for the whole system. This […]

  • Using awk to generate calendar applet in shell


    Recently, while studying sed and awk, I found a good book at the entry level: software design Chinese version 03.Our calendar program here is also from there. It is highly recommended that comrades who want to know sed and awk start this book. Code segment: #Generate calendar in shell #How to use # awk -f […]

  • Introduction to Linux basic commands eight: text analysis awk


    awkIt is a pattern scanning and processing language, which is a very powerful tool when analyzing and processing data. awk [options] ‘pattern {action}’ file… awkThe working process of is as follows: read the input (standard input or file) by line, for compliance modepatternLines of, executeaction。 WhenpatternOmit to match any string; whenactionIf omitted, it means execution'{print}’; […]

  • How to use the next command of awk


    In the awk series, let’s take a look at the next command, which tells awk to skip all of the remaining patterns and expressions you provide and work directly on the next input line. The next command helps you prevent redundant steps in the execution of the run command. To understand how it works, let’s […]

  • To delete duplicate lines of text in Linux awk, we need to pay attention to the problem of cast


    You want to delete the first three duplicate lines of the same IP address. The test text is as follows: # cat 1.txt If the array subscript is not quoted, it will be forced to a number in this special case, which eventually leads to statistics failure: # awk ‘BEGIN{FS=OFS=”.”}{if(!a[$1.$2.$3]++)print}’ 1.txt […]