What is the output of echo ${hi:-bye} if hi is unset?

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Multiple Choice

What is the output of echo ${hi:-bye} if hi is unset?

Explanation:
This tests how Bash handles default values in parameter expansion. The expression ${hi:-bye} means: if hi is set and non-empty, use its value; otherwise use the default word bye. Since hi is unset, the expansion uses the default, and echo prints that value. So the actual output is the string bye (lowercase). The option showing a capitalized Bye is just a capitalization mismatch in the list.

This tests how Bash handles default values in parameter expansion. The expression ${hi:-bye} means: if hi is set and non-empty, use its value; otherwise use the default word bye. Since hi is unset, the expansion uses the default, and echo prints that value. So the actual output is the string bye (lowercase). The option showing a capitalized Bye is just a capitalization mismatch in the list.

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