In the Linux operating system, cat is a very commonly used command for concatenating and displaying the contents of files. Here are some common uses of the cat command
Display file contents; use the cat command to display the contents of one or more files.
For example:
cat filename
Concatenate multiple files; use the cat command to concatenate multiple files and output their contents to the standard output stream.
For example:
cat file1 file2 file3 > output
Create a new file; use the cat command to create a new file
For example:
cat file1 file2 file3 > output。
This command will make the user enter text, press Ctrl+D to end the input and save the text as a file.
Display line numbers; use the cat command to display the contents of a file and add line numbers to each line.
For example:
cat -n filename
View non-printing characters; use the cat command to view non-printing characters.
For example:
cat -v filename
This command will display non-printing characters such as tabs and newlines in the file.
Display the last few lines of the file; use the cat command to display the last few lines of the file.
For example:
cat filename | tail
Copy files; use the cat command to copy files.
For example:
cat filename | tail
The above are some common usages of the cat command, and there are other usages. You can also view the manual page of the cat command by entering the man cat command in the terminal.