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Have fun trying to use _ as a variable though ;-). It’s effectively write-only and the value is lost immediately.

Stephen Kitt
– Stephen Kitt

2018-04-09 21:06:04 +00:00
Commented Apr 9, 2018 at 21:06
1

Also, internally Bash does treat _ as a variable, which is why it appears in the output of set. However it can’t be marked as exported as far as I can determine.

Stephen Kitt
– Stephen Kitt

2018-04-09 21:07:33 +00:00
Commented Apr 9, 2018 at 21:07
2

@StephenKitt, but Bash 4.4 allows marking it read-only. Or an integer. With somewhat hilarious results.

ilkkachu
– ilkkachu

2018-04-09 21:10:41 +00:00
Commented Apr 9, 2018 at 21:10
1

Ha, nice find, that’s rather amusing!

Stephen Kitt
– Stephen Kitt

2018-04-09 21:14:53 +00:00
Commented Apr 9, 2018 at 21:14

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