Unix Shell
Quoting
In POSIX, single quotes cannot be used inside single quotes. It's necessary to close the quote, then either backslash escape the single quote or surround it with double quotes.
e.g.
$ echo 'abc'\''def' abc'def $ echo 'abc'"'"'def' abc'def
Alternatively, use double quotes which also expands all variables:
$ echo "abc'def" abc'def $ echo "abc\"def" abc"def
See https://unix.stackexchange.com/questions/187651/how-to-echo-single-quote-when-using-single-quote-to-wrap-special-characters-in and the referenced Quotes - Greg's Wiki
-- Frank Dean - 7 Sep 2017
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