Hello,

The example on parameter expansion[1] should perhaps read :

$ echo ${v:-unset}

instead of :

$ echo ${v-unset}

Yes ? More context:

---8<---
${parameter:-word}

If parameter is unset or null, the expansion of word is substituted. Otherwise, 
the value of parameter is substituted.

$ v=123
$ echo ${v-unset}
123
--->8---

Thanks !

--
1.
https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html

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