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並前往https://stackoverflow.com/questions/3601515/how-to-check-if-a-variable-is-set-in-bash

How to check if a variable is set in Bash? - Stack Overflow

One construct I use in almost any script I write is : ${FOOBAR:=/etc/foobar.conf} to set a default value for a variable if it is unset or null. – Jens. Mar 10 ' ...

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