"1" displays the date of the instruction: date
Example:
(1) #date +%y/%m/%d
Results: 2018/02/27
(2) #date +%h:%m
Result: 10:48
"2" displays the calendar's instructions: Cal
format:
Cal [Month] [year]
Example:
(1) #cal 2 2018
(2) #cal 13 2018
Results: Cal:illegal Month Value:use 1-12
"3" File and directory view: LS
format:
ls [-aadffhilnrrst] file name or directory name
ls [--color=[never,auto,aiways]] file name or directory name
ls [--full-time] file name or directory name
options and Parameters:
-A: All files are listed together with the hidden file
-A: All files, but not included. With the. That means the current directory and home directory
-D: Lists only the directory itself, not the file data in the directory
-F: List results directly without sorting
-F: To give additional data display according to the information such as file, directory, for example (*): On behalf of executable file; (/): representative directory; (=): represents socket file; (|): Represents FIFO file
-H: List the file capacity in an easy-to-read manner (e.g. GB,KB, etc.)
-I: List inode numbers
-L: Long data format, including information such as properties and permissions for files
-N: Lists UID and GID numbers instead of user and group names
-r: Reverse output of the sort results, for example: original file name from small to large, reverse is from big to small
-r: List all the contents of subdirectories together
-S: Sort by size of file content, not by filename
-T: Sort by time rather than by file name
--color=never: Do not give color display based on file characteristics
--color=always: Display Color
--color=auto: Let the system decide whether to give the color according to the setting
--full-time: Includes year, month, day, hour, and minute outputs in full time mode
--time=[atime,ctime]: Output access time (atime) or Change permission attribute time (CTime) instead of content change time
Example:
(1) Ls-al ~
List all the files in the home directory, including attributes and hidden files
(2) Ls-alf--color=never ~
List all the files in the home directory, including properties and hidden files, show the type of the file, do not display the color
(3) Ls-al--full-time ~
List all the files in the home directory, including properties and hidden files, and display the full file modification time
Linux Basic common commands ls detailed (including date,cal)
