What does the 'echo' command do in Linux?

The 'echo' command in Linux is primarily used to display a message or output directly to the terminal. This command takes a string of text as an argument and outputs that text to the standard output, typically the screen. It is commonly used in scripts and command-line operations to show messages, feedback, or the values of variables. For example, when you run echo "Hello, World!", it will output "Hello, World!" in the terminal.

The other options refer to functions that are not associated with the 'echo' command. The 'echo' command does not alert the system, create log files, or execute scripts. These functionalities are achieved through different commands and practices in Linux.