$: add $PS0 to examples (#15208)
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@@ -17,7 +17,7 @@
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- Print one of the prompt strings:
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`echo ${{PS1|PS2|PS3|PS4}}`
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`echo ${{PS0|PS1|PS2|PS3|PS4}}`
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- Expand with the output of `command` and run it. Same as enclosing `command` in backtics:
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