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Shell Parameter Expansion (Bash Reference Manual)
[https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html] - - public:mzimmerm
Assigning default values and variable substitution in bash - Stack Overflow
[https://stackoverflow.com/questions/2013547/assigning-default-values-to-shell-variables-with-a-single-command-in-bash#2013589] - - public:mzimmerm