Use of Linux ls command

ls [OPTION]... [FILE]...

-a, --all: Display all files and directories (ls considers files or directories whose names begin with "." as hidden files and will not list them by default); 
-A, --almost-all: Displays a list of all files except the hidden files "." and ".."; 
--author: Used in conjunction with the -l option, print out the author of each file;
-b, --escape: Output the non-printable characters in the file in the form of backslash “\” plus character encoding;
--block-size=SIZE: Use the specified SIZE as the unit for statistical file size. SIZE can take the following strings or corresponding values: KB 1000, K 1024, MB 1000*1000, M 1024*1024, as well as G, T, P, E, Z, Y, etc.;
-B, --ignore-backups: Do not list implicit entries ending with ~, listed by default;
-c: When used with the "-l" option, display ctime; when used with the "-lt" option, the output is sorted by the time the file status changed, and the sorting is based on the ctime field in the file's inode;
-C: Display output results in multiple columns. This is the default option; 
--color[=WHEN]: Use different colors to highlight different types of files. The default value of WHEN is 'always', which can also be 'never' or 'auto';
-d, --directory: Display only the directory name, not the directory contents list. Display the symbolic link file itself, not the directory or file it points to; 
-D, --dired: Output in Emacs's dired mode;
-f: This parameter has the same effect as specifying the "aU" parameter at the same time, and turns off the effect of the "-ls --color" parameter; 
-F, --classify: Append the file type identifier after each output item. The specific meaning is: "*" represents a regular file with executable permission, "/" represents a directory, "@" represents a symbolic link, "|" represents a command pipe FIFO, and "=" represents a socket. When the file is a normal file, no identifier is output; 
--file-type: Same as the "-F" option, but "*" is not displayed; 
--format=WORD: The value of WORD is across, which is equivalent to the -x option. The value is commas, which is equivalent to -m. The value is horizontal, which is equivalent to -x. The value is long, equivalent to -l. The value is single-column, which is equivalent to -1. The value is verbose, which is equivalent to -l. The value is vertical, which is equivalent to -C;
--full-time: List the full date and time;
-g: Similar to -l, but does not list the owner;
--group-directories-first: Directories are listed before files;
-G, --no-group: Do not output group name when outputting in long format (-l);
-h, --human-readable: Display file size in human-readable format;
--si: Calculate the file size as 1000 instead of 1024;
-H, --dereference-command-line: Use the real destination indicated by the symbolic link in the command line;
--dereference-command-line-symlink-to-dir: Follow symbolic links listed on the command line;
--hide=PATTERN: Do not list hidden files that match the PATTERN model;
--indicator-style=WORD: Append indicator WORD to each file or directory name, none defaults to slash (-p), file-type (--file-type), classify (-F);
-i, --inode: Display the file index node number (inode). An inode represents a file; 
-I, --ignore=PATTERN: Do not list files or directory names matching PATTERN;
-k: Display file size in KB (kilobytes), similar to --block-size=1K;
-1: Number 1, opposite to the "-C" option function, all output information is output in a single column format, not in multiple columns;
-l: Display the directory contents list in long format. The output information includes file name, file type, permission mode, number of hard links, owner, group, file size and the last modification time of the file from left to right; 
-L, --dereference: If a file or directory that is a symbolic link is encountered, directly list the original file or directory pointed to by the link; 
-m: Use “,” to separate the names of each file and directory; 
-n: Replace the name with the user ID and group ID; 
-N, --literal: List file and directory names directly, including control characters;
-o: This parameter has a similar effect to "-l", but does not list user group information;
-p, --indicator-style=slash: Append slash/indicator to directory names;
-q, --hide-control-chars: Replace control characters with "?" and list file and directory names;
--show-control-chars: Display control characters in file and directory names;
-Q, --quote-name: Enclose file and directory names in double quotes "".
--quoting-style=WORD: Use the specified quotation mark pattern to identify the file name. The values ​​of WORD are: literal, locale, shell, shell-always, c, escape;
-r, --reverse: Output directory contents in reverse order of file names;
-R, --recursive: recursive processing, all files and subdirectories under the specified directory will be processed together; 
-s, --size: Display the size of files and directories in blocks; 
-S: Sort by file size;
--sort=WORD: Sort by the specified content instead of the default file name. The possible values ​​of WORD are: none (no sorting, equal to -U); extension (sort by the last extension of the entry name, equal to -X); size (sort by the size of the entry, equal to -S); time (sort by the last modification time of the entry content, equal to -t); version (sort by the entry version, equal to -v);
--time=WORD: When using -t or --sort=time to sort by time, the WORD value can be atime, access, use (indicates sorting by access time); or ctime, status (sorting by status change time), to replace the default sorting by content modification time;
--time-style=STYLE: When using the -l option, the time is displayed using the specified style STYLE. The possible values ​​are full-iso, long-iso, iso, locale, and +FORMAT, FORMAT. For the setting formats of these two items, please refer to the setting methods of the date command;
-t: Sort by the modification time of the files and directories; 
-T, --tabsize=COLS: Set the width of the tab separator between each column to COLS, the default is 8 spaces;
-u: used with -lt, it indicates sorting by access time. Used with -l, it displays access time instead of content modification time.
-U: Do not sort when listing file and directory names;
-v: The list of file and directory names is sorted by version;
-w, --width=COLS: Set the maximum number of characters per column to COLS;
-x: Display file and directory names in horizontal columns from left to right and from top to bottom;
-X: Sort by the last extension of files and directories;
--help: Display help information;
--version: Display version information;

ls -t

# Descending sort ls -hS

# Increasing sort ls -hrS

[dablelv@TENCENT64 ~]$ ll -a
total 148
drwxr-x--- 8 dablelv dablelv 4096 Nov 23 23:56 .
drwxr-xr-x 22 root root 4096 Jun 7 15:15 ..
-rw------- 1 dablelv dablelv 71812 Nov 24 00:38 .bash_history
-rw-r--r-- 1 dablelv dablelv 2153 May 2 2017 .bash_profile
-rw------- 1 dablelv dablelv 595 Nov 24 16:57 .lesshst
drwx------ 2 dablelv dablelv 4096 Jul 23 20:42 .ssh

[dablelv@TENCENT64 ~]$ alias
alias l.='ls -d .* --color=auto'
alias ll='ls -l --color=auto'
alias ls='ls --color=auto'
alias vi='vim'
alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'

[dablelv@TENCENT64 ~]$ ll --block-size=K
total 24K
drwxrwxr-x 10 dablelv dablelv 4K Nov 21 15:08 code_root
-rwxrwxr-x 1 dablelv dablelv 1K Nov 21 00:18 dable.php
-rw-rw-r-- 1 dablelv dablelv 1K Nov 21 00:18 dablelala.php
-rw-rw-r-- 1 dablelv dablelv 0K Nov 23 23:56 dablelv~
-rw-rw-r-- 1 dablelv dablelv 1K Nov 21 00:40 dablenewnew
drwxrwxrwx 2 dablelv dablelv 4K Nov 21 00:29 new
drwxrwxr-x 6 dablelv dablelv 4K Nov 21 00:24 test