What is the difference between ${variable} and $variable when used in a script?
Just like that? Nothing. But try this snippet:
variable='Test'
echo "${variable}1"
echo "$variable1"
No difference. The right syntax is ${var} but $var is shortcut when it's unambiguous (and it often is).
f=somefile
mv "$f" "$f".bak # no needed
mv "$f" "${f}_bak" # needed
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