지식나눔

1. Monitoring system statistics ​ One of the main tasks as a system administrator is to check and manage whether the system is operating properly through statistics. This time, let's take a look at a script that manages and reports statistics that should be basically managed through Shell Sciprt. ​ ​ disk space monitoring To monitor disk space with the command 'df', use the command. Below is the..

Nowadays, most of our daily life is done through e-mail, so it is necessary to use e-mail in Linux as well. So, in this chapter, we will learn how to use e-mail in Linux. ​ ​ The Linux system is derived from the Unix environment. The figure below shows the structure of the e-mail environment in Linux. ​ The e-mail system in Linux was used to implement the e-mail system used in the old Unix and w..

1. Lynx Program Like the Internet, the Lynx program is a very old text-based web program. Lynx program allows users to use Wbe on the terminal. Through the Lynx program in Shell Script, web page data can be received in text-based format and can be processed and used in Script. ​ Installing Lynx 1) Download the latest package to install from the site below. ​ Site: LYNX – The Text Web-Browser (in..

You can process data with a script and store it in a variable to use it, but when the script ends, all the processed data is deleted. In order to use persistent data, a database must be used in the script. In this chapter, we will learn how to use the database. ​ 1. MySQL Database First, let's look at how to install MySQL. 1) Connect to the www.mysql.com site. 2) Click the Download Link and down..

In this chapter, we will learn how to use gawk in more detail than the basic usage of gawk discussed in the previous chapter.. ​ 1. Using Variables One of the main functions is to save data using variables thrown by any program and to call it back and use it. awk supports the following two types of variables. ■ Built-in variables ■ User-defined variables ​ Built-in variables As we saw in the pre..

1. Multiline Commands Basically, the sed editor operates in a structure that processes one line at a time from multiple data lines and processes the next line. However, when the data to be processed spans multiple lines, data processing becomes difficult with the basic sed processing structure. For this, the advanced sed editor provides the following three commands. ■ N: Allows adding a new data..

A regular expression is a user-defined pattern that allows Linux utilities to filter text. The figure below shows the process of filtering data using regular expressions. For example, the "*' character lists all files that match the pattern. Let's take a look at the example below. $ ls -al da* -rw-r--r-- 1 ==>List all files starting with da ​ -rw-r--r-- 1 rich rich 25 Dec 4 12:40 data.ts -rw-r--..

1. Manipulate text Log files or a lot of data in Linux are stored in text format. Among these text editors, sed and gawk are among the text editors that extract only the necessary information from these texts, process them, and make them useful. ​ sed Editor The sed editor is called the stream editor. In general interactive text editor, when inserting, deleting, or replacing data, input and proc..

Since all scripts are text-based, there are many inconveniences to use. So, in this chapter, we will learn how to use graphics in scripts. ​ 1. Create a text menu It seems cleaner from the user's point of view to clear everything currently displayed on the screen before using the graphic in a script. The command for this is the clear command. And you can use the echo command to decide what to di..

1. Basic Script Finction When writing a script, it is often necessary to write the same code in multiple scripts separately. For this, if the codes of commonly used scripts are made into functions, scripts that are written later do not need the entire code, but simply call the function. ​ Create a function There are two forms of creating a function. Please see below.. ​ The first form: how to de..