var jsonData = JSON.parse(responseBody);
postman.setEnvironmentVariable("postmanVarName", jsonData.varName);
Take from https://askubuntu.com/questions/63594/mount-encrypted-volumes-from-command-line
udisksctl unlock -b /dev/sdb5
udisksctl mount -b /dev/mapper/ubuntu--vg-root
After typing the first command, you'll be prompted for your encryption passphrase. Once the encrypted partition is unlocked, the second command will mount it. If that's successful, you'll end up with a message similar to this:
Mounted /dev/dm-1 at /media/dpm/e8cf82c0-f0a3-41b3-ab28-1f9d23fcfa72