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The secondary prompt (PS2) is used to prompt the user with whatever string they want to indicate a command continuation line. For example, if I use the standard PS2 prompt and type in the command:

cat abc def \

The shell will prompt me for the rest of the line with a ? mark or some other character. I usually set my secondary prompt for something more interesting, such as:

PS2='more ? '

So that I know that the shell wants more information before executing the command line.

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Q: What is a secondary prompt in UNIX?
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