The password for the next level is stored in the file data.txt, which contains base64 encoded data
Commands you may need to solve this level
grep, sort, uniq, strings, base64, tr, tar, gzip, bzip2, xxd
The hint is the base64 encoded data. To get the next password, we will need to decode it from base64 encoding. From the man page for base64, -d will decode the file.
base64 -d data.txt The password is IFukwKGsFW8MOq3IRFqrxE1hxTNEbUPR