From urandom(4) on OpenBSD For portability reasons, never use /dev/random. On OpenBSD, it is an alias for /dev/urandom, but on many other systems misbehaves by blocking because their random number generators lack a robust boot-time initialization sequence.

no need to take an explicit length parameter when we can just advance the string until a NUL byte. base32 doesn't allow NUL bytes.

now `plass find ^keys' will correctly list only entries that starts with "keys"

previously, `plass tee' was limited to only one line; now it's unlimited. While here, fix the commit message too: checking the existence of the file after creating/overwriting it is stupid.