


How to check which subdirectories are in the current directory in Linux
In Linux, you can use the ls command to see which subdirectories are in the current directory. Just execute the "ls -a" command directly. It can display all subdirectories and files in the current directory, including hidden files. . The ls command is used to display the contents of the current directory. It can display the file list of the current directory or the file list under the specified path; the syntax is "ls [options] [dirname]", and the parameter "dirname" is used to set the requirements. The directory to be viewed defaults to the current directory.
#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.
In Linux, you can use the ls command to see which subdirectories are in the current directory.
linux ls command introduction
ls command, the abbreviation of list, is the most common directory operation command. Its main function is Display the contents of the current directory.
ls command is used to display the file list of the current directory, and can also be used to display the file list under the specified path.
Syntax:
ls [options] [dirname]
Parameters | Description |
---|---|
options | parameters used by the ls command. |
dirname | The directory to be viewed, defaults to the current directory. |
Table 1 lists the commonly used options of the ls command and their respective functions.
Options | Function |
---|---|
Display all files, including hidden files (files starting with .), which are also listed together. This is one of the most commonly used options. | |
Display all files, including hidden files, but excludes the . and .. directories. | |
Only lists the directory itself, not the file data within the directory. | |
#ls will sort by file name by default. Using the -f option will list the results directly without sorting. | |
Add the file type indicator after the file or directory name, for example, * represents a executable file, / represents a directory, = represents a socket file, | stands for FIFO file. | |
Display file or directory size in a human-readable way, such as 1KB, 234MB, 2GB, etc. | |
Display inode node information. | |
Use long format to list file and directory information. | |
UID and GID are displayed instead of the file user name and group name respectively. | |
Output the sorting results in the reverse direction. For example, if the original file names are from small to large, the reverse is from large to small. | |
Listing together with the contents of the subdirectory is equivalent to displaying all files in the directory. | |
Sort by file size, not by file name. | |
Sort by time, not by file name. | |
--color=always --color=auto | never means that the color display is not based on the file characteristics. always means displaying color, ls adopts this method by default. auto means to let the system determine whether to give color based on the configuration. |
Output in full time mode (including year, month, day, hour, minute) | |
Output access time or change permission attribute time (ctime), not content change time. |
Common examples of Linux ls command
Description | |
---|---|
List all files in the current directory | |
column Get detailed information about all files in the current directory | |
List all files in the root directory | |
List the detailed information of all files in the root directory | |
Form the detailed information of the file in a human understandable way | |
List all files, including hidden files | |
List the information of the folder itself, not the file information under the folder | |
List file information sorted by file modification time | |
List file information in reverse order of file modification time | |
List all files starting with hai under the current path |
The above is the detailed content of How to check which subdirectories are in the current directory in Linux. For more information, please follow other related articles on the PHP Chinese website!

The five core components of the Linux operating system are: 1. Kernel, 2. System libraries, 3. System tools, 4. System services, 5. File system. These components work together to ensure the stable and efficient operation of the system, and together form a powerful and flexible operating system.

The five core elements of Linux are: 1. Kernel, 2. Command line interface, 3. File system, 4. Package management, 5. Community and open source. Together, these elements define the nature and functionality of Linux.

Linux user management and security can be achieved through the following steps: 1. Create users and groups, using commands such as sudouseradd-m-gdevelopers-s/bin/bashjohn. 2. Bulkly create users and set password policies, using the for loop and chpasswd commands. 3. Check and fix common errors, home directory and shell settings. 4. Implement best practices such as strong cryptographic policies, regular audits and the principle of minimum authority. 5. Optimize performance, use sudo and adjust PAM module configuration. Through these methods, users can be effectively managed and system security can be improved.

The core operations of Linux file system and process management include file system management and process control. 1) File system operations include creating, deleting, copying and moving files or directories, using commands such as mkdir, rmdir, cp and mv. 2) Process management involves starting, monitoring and killing processes, using commands such as ./my_script.sh&, top and kill.

Shell scripts are powerful tools for automated execution of commands in Linux systems. 1) The shell script executes commands line by line through the interpreter to process variable substitution and conditional judgment. 2) The basic usage includes backup operations, such as using the tar command to back up the directory. 3) Advanced usage involves the use of functions and case statements to manage services. 4) Debugging skills include using set-x to enable debugging mode and set-e to exit when the command fails. 5) Performance optimization is recommended to avoid subshells, use arrays and optimization loops.

Linux is a Unix-based multi-user, multi-tasking operating system that emphasizes simplicity, modularity and openness. Its core functions include: file system: organized in a tree structure, supports multiple file systems such as ext4, XFS, Btrfs, and use df-T to view file system types. Process management: View the process through the ps command, manage the process using PID, involving priority settings and signal processing. Network configuration: Flexible setting of IP addresses and managing network services, and use sudoipaddradd to configure IP. These features are applied in real-life operations through basic commands and advanced script automation, improving efficiency and reducing errors.

The methods to enter Linux maintenance mode include: 1. Edit the GRUB configuration file, add "single" or "1" parameters and update the GRUB configuration; 2. Edit the startup parameters in the GRUB menu, add "single" or "1". Exit maintenance mode only requires restarting the system. With these steps, you can quickly enter maintenance mode when needed and exit safely, ensuring system stability and security.

The core components of Linux include kernel, shell, file system, process management and memory management. 1) Kernel management system resources, 2) shell provides user interaction interface, 3) file system supports multiple formats, 4) Process management is implemented through system calls such as fork, and 5) memory management uses virtual memory technology.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 Chinese version
Chinese version, very easy to use

WebStorm Mac version
Useful JavaScript development tools

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver Mac version
Visual web development tools
