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Linux can view text content. It has a variety of built-in viewing commands: 1. cat, which can display content from the first line; 2. tac, which can display content from the last line; 3. more, which can Display content page by page; 4. head, you can view the content of the specified number of lines at the beginning of the text; 5. tail, you can view the several lines at the end of the text, etc.
#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.
Under Linux, you can use some commands to preview the contents of a text file without having to open it with a text editor.
Linux has a variety of built-in viewing commands. Here are some commonly used text viewing commands:
cat：从第一行开始显示文本内容（适用于内容较少的） tac：从最后一行开始显示，是 cat 的逆顺序 more：一页一页的显示文本内容（适用于内容较多的） less：与 more 类似，但是比 more 更好的是，它可以往前翻页！ head：只看文本的前面几行 tail：只看文本的后面几行 nl：显示文本内容与行号
The cat command is often used to view files with less content. Many people call this command the "kitten" command, but cat is actually the abbreviation of concatenate, which means continuous display of text content.
格式为：cat [参数选项] [文件]
Among them, add the parameter-nto display the number of lines. For more parameter options of cat, you can enterman catto view. Detailed introductions to other commands listed below can also be viewed by entering theman command.
The tac command is just the opposite of the cat command, which starts displaying from the end of the file.
The more command is suitable for viewing files with large content. Because it can display the percentage in real time to indicate how much content has been read.
格式为：more [参数选项] [文件]
You can use thespace barorEnter keyto page down to view the following content.
less is also suitable for viewing files with large content. Less is more flexible than more because less can turn pages up and down. Press thePgUpkey on the keyboard to page up, and press thePgDnkey to page down. But the less command does not display the current reading percentage in real time.
格式为：less [参数选项] [文件]
The head command is used to view the first n lines of the file. For example, use the command
head -n 20 /etc/profile
to view the first 20 lines of the profile file in the /etc directory:
The tail command is the opposite of the head command. The tail command is used to view the last n lines of the file. For example:
nl command can display the line number while displaying the content, andcat - nThe functions of the commands are similar:
The above commands are some text viewing commands under Linux. Although their functions are the same, they are all used to view text, but they can Choosing different commands to view according to different situations allows us to better preview files.
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