Very Computer

1. add in the PATH a path if not present in the PATH

I look for a function in POSIX shell. this function must add path in the
$PATH if it isn't present.
by example:
I want add /bin in PATH
echo $PATH
--> /bin:/usr/bin
/bin is in the PATH then i don't add /bin
If I want add /usr/local/bin
/usr/local/bin isn't in the PATH then I add:
PATH=${PATH}:/usr/local/bin

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