What is the purpose of a here document in shell scripting?

• A. It prints to the screen and ignores quotes
• B. It writes binary data to a file
• C. It allows you to feed a line of commands into a program and prints text literally
• D. It only copies files

Answer: (C)

A here document lets you provide a block of text or commands directly as input to a command in one go. You write the command, then use the redirection operator << and a delimiter. The shell collects everything up to that delimiter and passes it to the command on standard input. If you quote the delimiter (for example, <<'EOF'), the content is treated literally, meaning no variable expansion or command substitution happens, so the text is preserved exactly as written. This is why it’s described as feeding a line (or lines) of commands or data to a program while preserving the text when needed.

For example, you can feed multiple lines into a program like:

cat <<EOF

First line

Second line

EOF

If you want the content to be taken literally, you can quote the delimiter:

cat <<'EOF'

$HOME

EOF

This capability is about supplying input to commands, not about printing to screen, writing binary data, or copying files, which is why the stated choice best captures the purpose.