/etc/shadow の password field
/etc/shadow の password field に出現する "!" や "*" についてのメモ。
MAN USERMOD(8)
OPTIONS
The options which apply to the usermod command are:
-L, --lock
Lock a user's password. This puts a '!' in front of the encrypted password, effectively disabling the password. You can't use this option with -p or -U.
