Easiest solution: use the PATHTOOL GUI. Or if you want command line access:

Suggested by Joshua Stiff: You can use addpath to add directories from the command line, and path2rc to write the current

path back to `pathdef.m'. If you do not have write permissions for `pathdef.m', path2rc can write to a different file, which

you can execute from your `startup.m'.

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