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This method uses SHA to hash the date, runs through base64, and then outputs the top 32 characters.
date +%s | sha256sum | base64 | head -c 32 ; echo
This method used the built-in /dev/urandom feature, and filters out only characters that you would normally use in a password. Then it outputs the top 32.
< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-32};echo;
This one uses openssl’s rand function, which may not be installed on your system. Good thing there’s lots of other examples, right?
openssl rand -base64 32
This one works a lot like the other urandom one, but just does the work in reverse. Bash is very powerful!
tr -cd '[:alnum:]' < /dev/urandom | fold -w30 | head -n1
Source: 10 Ways to Generate a Random Password from the Command Line