This is a small tool we wrote to assist validators in generating a bunch of pem files given a mnemonic.
$ npm install -g @elrondnetwork/elrond-pem
$ elrond-pem generate-mnemonic ./path-to-file/mnemonic.txt
$ elrond-pem generate-pems 10 0 0 # The parameters used are: numberOfPems, accountIndex, addressIndex
$ # You will be prompted to enter a path to a file containing your mnemonic, then a path to the output folder.
$ git clone [email protected]:ElrondNetwork/elrond-pem-js.git && cd elrond-pem-js
$ node ./index.js generate-mnemonic
$ node ./index.js 10 0 0