One thing that always confuses me when I’m writing Bash scripts is what type of quote to use in a given situation. Luckily, Hermit schooled me with this quick rundown:
“SOMETHING” = This means evaluate what’s between the quotes.
‘SOMETHING’ = This means don’t evaluate what’s between the quotes. This is a literal string.
`SOMETHING`= This means execute the stuff between the quotes and spit out the result. NOTE: These little back quotes are hard to find. Look on the tilde key.
$(SOMETHING) = Same as above.
– Killswitch
Hermit's Cave 
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