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並前往https://www.quora.com/How-do-I-set-a-variable-using-eval-in-shell

How do I set a variable using eval in shell? - Quora

eval p=\$x$y # same as: p=$xcat. If you desperately want to echo out of an eval, you can do an extended shell escape (beware: that only works in Bash and ...

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