system accounts and /bin/false

I have some system accounts for example www-data that instead of
/bin/false being their shell in /etc/passwd it is set to /bin/sh this is
how it was after a clean install.


Is it safe to set all accounts that do not need to be logged into to
/bin/false or are there some system accounts pherhaps nobody that needs
/bin/sh instead of /bin/false?


Jim

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