How to permanently modify the $Path in Mathematica [duplicate]

Question

I was trying to add permanently a path inside $Path.

"/Users/Softwares/HEP_Softwares/MT-1.0"

Following $Path manual I did the following

AppendTo[$Path, FileNameJoin[{$HomeDirectory, "/Softwares/HEP_Softwares/MT-1.0""}]];

which does it successfully. However when I quit kernel it goes away. Then following some other Q/A I have messed with something. Now whenever I do to load the package

<<MT` 

it appends the path

/Users/Softwares/HEP_Softwares/MT-1.0 

in \$Path and does not load the package. Is there any way to overcome the situation without changing my previous definitions of \$Path ? Also what is the best way to add a path in $Path permanently? This question may be duplicate but a clear answer is still lacking.

Answer 1

Okay for future reference this could be one answer:

Check the Autoload and Kernel path by $Path.

One can then add the desired PATH (in this case /Users/Softwares/HEP_Softwares/MT ) inside

/Users/Library/Mathematica/Autoload/init.m

For example:

$MTPath = "/Users/Softwares/HEP_Softwares/MT"
If[Not[MemberQ[$Path,$MTPath]],$Path = Flatten[{$Path, $MTPath }]];

Then add the Autoload/init.m in Kernel (if not done already) i.e. in

/Users/Library/Mathematica/Kernel/init.m

by adding the following:

Get[ToFileName["/Users/Library/Mathematica/Autoload","init.m"]]