Hashcat pot file: permission denied

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That sucks. Same problem will exist for the outfile in case you have 2 instances of hashcat/oclHashcat-plus running and writing into the same outfile. It will get even worse if its a big list and you use --remove. So for the .pot part the best way would be to not run more than one instance within the same installation directory. Best way to workaround is to use a seperate installation directory. Or use the --disable-potfile