Which single character can be used to split a long command across multiple lines in the shell?

Using the backslash character allows you to split a long command across multiple lines in the shell. This is particularly useful for improving readability when dealing with complex commands or long arguments. When the backslash is placed at the end of a line, it signals to the shell that the command continues on the next line. This way, you can break the command into smaller, manageable chunks without altering its execution.

For example, you might have a command that lists files with a variety of options that could extend over several lines. By ending each line with a backslash, you can maintain readability while ensuring the shell interprets it as a single continuous command. This method is commonly used in shell scripting and command line usage to enhance clarity, especially in scripts that require complex syntax.