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Continuing Lines
A related issue is how to continue the text of a command beyond a single line on your terminal or workstation window. The answer is conceptually simple: just quote the RETURN key. After all, RETURN is really just another character.
You can do this in two ways: by ending a line with a backslash, or by not closing a quote mark (i.e., by including RETURN in a quoted string). If you use the backslash, there must be nothing between it and the end of the line—not even spaces or TABs.
Whether you use a backslash or a single quote, you are telling the shell to ignore the special meaning of the RETURN character. After you press RETURN, the shell understands that you haven't finished your command line (i.e., since you haven't typed a "real" RETURN), so it responds with a secondary prompt, which is > by default, and waits for you to finish the line. You can continue a line as many times as you wish.
For example, if you want the shell to print the first sentence of of Lewis Carroll's Alice's Adventures in Wonderland, you can type this:
$ echo The Caterpillar and Alice looked at each other for some \
> time in silence: at last Caterpillar took the hookah out of its \
> mouth, and addressed her in a languid, sleepy voice.
Or you can do it this way:
$ echo 'The Caterpillar and Alice looked at each other for some
> time in silence: at last Caterpillar took the hookah out of its
> mouth, and addressed her in a languid, sleepy voice.'
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