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Try "man 5 passwd"
You can see this yourself by looking at the passwd file - it is the colon symbol.
passwd
grep -i "oot" /etc/passwd (Note, the -i allows the search to be case-insensitive)
$ passwd to change your own password:
Log in as root to change the password for a user named fred:
# passwd fred
Commands to add a new user and then set a password for a user named fred:
# adduser fred