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Odd Bash Behavior

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I was just messing around with bash, and noticed what seemed to be odd behavior

[email protected] ~ $ echo {a,d}oo
aoo doo
[email protected] ~ $ echo {a,}oo
aoo oo
[email protected] ~ $ echo {,a}oo
oo aoo
[email protected] ~ $ ¬†echo {a}oo

I guess I would have thought `echo {a}oo` would have produced aoo

Edited by shanenin

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this is from man bash

A correctly-formed brace expansion must contain unquoted opening and closing braces, and at least one unquoted comma or a valid sequence expression.

it still seems unlogical(in my mind) :-)

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