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alllex · Dec 22, 2024 · 5a79cf1 · 5a79cf1
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 ### Parameter substitution
 
+Excerpts from an advanced [parameter substitution guide](https://tldp.org/LDP/abs/html/parameter-substitution.html).
+
 Almost all substitution operators work with and without `:`. If `:` is used then the default value is substituted both when variable is *unset* or *empty*. If `:` is not used, then the default is substituted only when the variable is *unset*.
 
 ```bash