In command-line redirection, what does the sequence "command 2>>errorfile.txt" accomplish?

• A. Appends errors to errorfile.txt
• B. Writes all output to console
• C. Redirects standard output to errorfile.txt
• D. Creates a new file without writing

Answer: (A)

Redirection targets the standard error stream and appends it to the specified file. In shells, every command has standard output (1) and standard error (2). Using 2>>errorfile.txt takes whatever error messages the command would print and adds them to the end of errorfile.txt, creating the file if it doesn’t exist. It does not affect standard output, so normal output continues to go to the console unless you redirect it as well. If you used a single > instead of >>, it would overwrite the file instead of appending.