...e-password' with a random value. if the concatenation of the username and password with a dash in the middle returns any result, the user is valid. this is useful in cases where…...o appear in group- and usernames: letters, digits, underscores, periods, at signs (@) and dashes. The name may not start with a dash or @. The "$" sign is allowed at the end of …...o appear in group- and usernames: letters, digits, underscores, periods, at signs (@) and dashes. The name may not start with a dash or @. The "$" sign is allowed at the end of …...needed. Groupnames may contain only lower and upper case letters, digits, underscores, or dashes. They can end with a dollar sign. Dashes are not allowed at the beginning of the…...ate-passwd follows the usual GNU command line syntax, with long options starting with two dashes (‘-’). -p , --passwd-master=FILE Use FILE as the master copy of the passwd datab…...request. Usernames may contain only lower and upper case letters, digits, underscores, or dashes. They can end with a dollar sign. Dashes are not allowed at the beginning of the…