Display the last few lines of the specified file on the screen

Concatenate multiple files and print line-by-line reverse to standard output.

Displays information about devices in the system based on buses, classes, and topology

System Service Manager Directives

System default log daemon

Dynamically modify the kernel's operating parameters

Used to force changed content to be written to disk immediately

Activate swap space in Linux system

Close the specified swap space

Suspends the execution of the shell.

Process manager tool for configuring background services/resident processes

Calculate the checksum and display block number of the file