The cat command is used to view the content of plain text files, targeting files with less content. The viewing method of large files will be introduced later.
Syntax format: cat [parameter] [file]
Common parameters:
Example
# 查看文件test.py的内容，并显示行号cat -n test.py
If there is no editor in the system, you can also use cat to edit the file
# 如果是追加内容的话，使用>>，EOF是结束标记cat > test.py << EOF > import os > print('Hello Python.') > EOF
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