A shell is a command-line interface that allows users to interact with an operating system by entering commands and managing processes.
The shell environment includes configurations like variables, aliases, and paths that customize the shell's behavior.
A shell script is a sequence of shell commands saved in a file, enabling users to automate tasks and execute commands sequentially.
Key concepts include prompts, commands, variables, aliases, environment variables, paths, redirection, and pipelines.
Shell scripts allow users to automate tasks, customize workflows, and perform repetitive operations by executing a sequence of commands.
For example, a simple shell script could use the echo command to print "Hello, world!" to the terminal.