Failed to use the --username switch in Hashcat 3.20 on OS X

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Something is wrong with the commandline you posted:

./hashcat -a 0 -m 3200 --session=all --username -p : potfile-disable -o xxx/xxx_plains.txt --outfile-format=2 -w 2 xxx/xxx_pfile.txt dictionaries/big001.txt

The potfile-disable should be --potfile-disable

Also, from the error you posted

Hash '--username': Line-length exception

This means hashcat thinks "--username" is the hash. So generally, I think the only problem here is using an wrong commandline.

The error

ERROR: (null): No such file or directory

Has been fixed for OSX with v3.20. Basically, to workaround, I think you need to mkdir /usr/local/bin but I'm not OSX expert.

The error:

/bin/sh: gsed: command not found

Also has been fixed for OSX with v3.20.

So the way to go is not to backport. Better find the reason why v3.20 isn't working for you.