Single vs Double Quotes

Single quotes ('') and double quotes ("") in Bash are not the same thing!

String inside single quotes is treated as literal string. Variable expansion or command substitution won't happend inside single quotes.

Example:

$ echo "$(date)"
Sun May 19 03:52:50 PM +03 2024
$ echo '$(date)'
$(date)

More: stackoverflow.com/questions/6697753/what-are-the-differences-between-single-and-double-quotes-in-bash

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