The ls command is one of the most commonly used commands under Linux. ls is the same as the dir command under dos and is used to list files in a directory. \x0d\1. ls -a lists all files under the file, including hidden files starting with "." (hidden files under Linux start with ., if .. exists, it means the parent directory exists). \x0d\2. ls -l lists the detailed information of the file, such as the creator, creation time, read and write permission list of the file, etc. \x0d\3. ls -F adds a character at the end of each file to indicate the type of the file. "@" represents a symbolic link, "|" represents FIFOS, "/" represents a directory, and "=" represents a socket. \x0d\4. ls -s prints the file size after each file. size(size)\x0d\5. ls -t Sort files by time Time(time)\x0d\6. ls -A List files except "." and "..". \x0d\7. ls -R lists the files in all subdirectories in the directory, which is equivalent to the "recursive" implementation in our programming\x0d\8. ls -L lists the link names of the files.

Link\x0d\9. ls -S sorts files by size