List of files and directories
The most basic form of the LS command displays files and directories under the Pro directory
The table of contents and files will display color distinctions.
If the terminal is not supported in color, you can add the-F option to the directory with a forward slash/
Ls-a shows hidden files, hidden files on Linux are files with the file name starting with the dot. There are three files for each user's home directory. Bash starts with a file
/etc/profile: This file sets the environment information for each user of the system, and the file is executed the first time the user logs on. and collects the shell settings from the configuration file of the/ETC/PROFILE.D directory.
/ETC/BASHRC: Executes this file for each user running the bash shell. When the bash shell is opened, the file is read.
~/.bash_profile: Each user can use this file to enter shell information dedicated to their own use, when the user logs on, the file is only executed once! By default, he sets some environment variables to execute the user's. bashrc file.
~/.BASHRC: This file contains bash information dedicated to your bash shell, which is read when you log in and every time you open a new shell. This file is for a specific user, if you need to set an environment variable for a user, you only need to modify the. bashrc file in the home directory of their individual users.
~/.bash_logout: Executes the file each time it exits the system (exiting the bash shell).
Variables set in/etc/profile (global) can be applied to any user, while variables set in ~/.BASHRC and so on (local) can only inherit variables from/etc/profile, they are "parent-child" relationships.
Ls-r recursion. You can list files in subdirectories that are contained in the current directory
Ls-l Options Show long list
The long list displays the following information
File types: such as directory (d), file (-), character file (c), block device (b)
File permissions rwx read and write execution
Total number of hard links to files
The owner name of the file
Group name of the genus Group of the file
Size of File
File name or directory name
Wildcard Filter Output list
Say hello (?) ) Represents a character
An asterisk (*) represents 0 or more characters
[] Bracket Matching
[! ] An exclamation mark sends out unwanted content.
Ls-t sort the latest modification time sort
Directory under AGF.4, AFD02,A1.TXT,BCATT,BD1TX file day01,day02,day03 three directories please find a file or directory that does not start with the letter A, not a file or directory ending in 1, find the first letter with a and the second letter is any , the third letter A-Z, the fourth character arbitrarily, five alphanumeric-between 0-3 or a-d
#/bin/bash
Ls-l
Ls-l [!a]*
Ls-l *[!1]
A shell command script every day
