bash variables

How do I join two strings under BASH? I have two strings stored in two different variables (_p=/delta and _u=aqua) and how do I join this and assign it to another variable in bash?

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How do I append additional text a variable? For e.g., I’ve a vech set as follows:
vech=”London”

I’d like to add (append) “Bus” word to $vevh under UNIX scripting using bash?

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