Editor’s Recommendation
Linux commands are used to manage the Linux system. In the Linux system, everything from the central processing unit, memory, disk drives, keyboard, mouse, to users is treated as files. The commands for managing the Linux system are the core of its normal operation. One important point to note is that unlike DOS commands, Linux commands (including filenames, etc.) are case-sensitive.
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Linux commands can be divided into internal commands and external commands: internal commands are loaded into memory when the system starts and reside in memory, which makes them efficient to execute. External commands are software functionalities of the system, which are read into memory from the hard disk only when needed by the user.
External commands, also known as filesystem commands, are programs outside the bash shell and are not part of the shell. External commands are generally located in /bin, /usr/bin, /sbin, or /usr/sbin.
Internal commands are integrated with the shell; they exist as components of shell tools and do not require spawning a subprocess to execute or opening a program file. We should also note that many commands have multiple implementations (for example, the same command may be both an internal and an external command).
Online Query and Help Commands
File and Directory Operation Commands
View File and Content Processing Commands
File Compression and Decompression Commands
Information Display Commands
File Search Commands
User Management Commands
Basic Network Operation Commands
Advanced Network Operation Commands
Commands Related to Disks and File Systems
System Permissions and User Authorization Commands
Commands to View System User Login Information
Built-in Commands and Others
System Management and Performance Monitoring Commands
Shutdown / Restart / Logout and View System Information Commands
Process Management Commands
