我查看了一下man useradd,发现
-p The encrypted password, as returned by crypt(3). The default is to disable the account.
是这样的提示哦!后来我useradd -p '$1$Qc8t1P9T$ee/uWN.AYgPuzCCmV/peg0' bx再用 bx登陆的时候,我输入ww,520的密码就正确了。因为ww,520被shadow加密后就是:$1$Qc8t1P9T$ee/uWN.AYgPuzCCmV/peg0