In the Linux system, files are a part of our daily work that we often come into contact with. Whether it is writing code, storing data or recording logs, we need to create files for operations. So in the Linux system, how to use commands to create files? The following are the details:
1. Create a blank file
To create a blank file in Linux system, you can use touch command. This command updates the timestamp of the specified file or directory and automatically creates a new blank file if the file does not exist.
For example, to create a blank text document called test.txt in the current directory:
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touch test.txt
After running the above command, you can find the newly created blank text file test.txt in the current directory.
2. Use the echo command to write content to an existing or newly created text document
The echo command is used to print output strings or variables to the standard output device (screen). Of course, it can also be redirected to a specified location (such as an existing or newly created text document).
For example, suppose there is already a blank text file called test.txt in the current directory, and you want to write something into it:
echo “Hello World!” > test.txt
After running the above command, the string "Hello World!" will be written in the test.txt file.
If you want to add more content to this file, you can use the following command:
echo “This is a new line.” >> test.txt
The double greater than sign (>>) is used here to indicate the append mode, that is, the new content is added to the end of the original content.
3. Use the cat command to create and output files
The cat command is used to concatenate files and print to the standard output device. You can also use it to create a new text document and write something in it.
For example, execute the following command in the current directory:
cat > test.txt
Then enter some text (eg "Hello World!") and press Ctrl+D to exit edit mode. At this time, the text entered just now will be automatically saved and written into the test.txt file.
4. Use the vi/vim editor to create and save the file
vi/vim is one of the most commonly used text editors in Linux systems. It can not only view and edit text files, but also supports syntax highlighting, search and replace in multiple programming languages.
To create a newly created blank text document using the vim editor on a Linux system, just run the following command:
vim test.txt
Then press i to enter insert mode, and start typing what you want to write inside the file. When you're done editing, press the Esc key to exit Insert mode. Then type: wq to save and exit the file.
5. Use the nano editor to create and save the file
nano is another commonly used text editor in Linux system. It is simpler and easier to use than the vi/vim editor.
To use the nano editor to create a newly created blank text document on a Linux system, just run the following command:
nano test.txt
Then enter what you want to write inside the file. After editing, press Ctrl+X and enter y to save and exit the file.