The Shell Parses Before It Runs
Explain the shell execution order well enough to predict what a basic command will do before pressing Enter.
The move: Read the command in shell order before you run it. A terminal command is not sent straight to the tool as raw text. The shell reads the line, breaks it into words and operators, applies quoting rules, parses simple or compound commands, performs expansions, prepares redirections, executes the program, and collects an exit status. That order explains why spaces, wildcards, variables, pipes, and redirection can change what actually happens. Most costly beginner mistakes are ordinary parse mistakes under pressure: an unquoted folder name, a glob that matches more files than expected, a redirect that truncates evidence, or a…
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