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Password Protection using Term::ReadKey
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passwd(1) General Commands Manual passwd(1) Name passwd - create or change password Syntax passwd [-aefs] [name] Description The command lets you or the superuser change your password. When you enter the command, the program prompts you for the old password and then for the new password. Next, the program asks you for the new password again, to verify that you have typed it correctly. Note that the passwords are not displayed on the screen. Your new password must meet the length requirements specified by the superuser. To review these requirements, refer to the file. (This is a read-only file.) If your system is running with increased security, you may have to choose a password from a list of randomly generated passwords, or you may need authorization to change your password. At higher security levels, you may be prohibited from changing your password until its minimum lifetime has expired, as specified in the Authorization Database. If you are running the BIND/Hesiod service, your password will be updated automatically on the server. Options -a Supply a list of randomly generated passwords. (See the Examples section.) -e Use an extended protocol when communicating with a prompter program. As a result, the standard input and output (used by is sent to this program. -f Change the finger information, not the password. The finger program provides information about current ULTRIX users, such as login and terminal name, idle time and office location. -s Change the login shell of the password file, not the password entry. Restrictions If you use a hardcopy terminal, you must destroy all print outs of valid passwords. Examples The following example illustrates the -a option, which displays a list of randomly generated passwords and their suggested pronunciation with hyphens. The hyphens delineate the syllables of the passwords: passwd -a abcd Changing password for abcd Here are some suggested passwords: ryegd ryeg-di aswurku a-swurk-u ryedok ryed-ok teleccs tel-ec-cos wahislas wa-hi-slas Enter new password: Diagnostics Password must be at least 6 characters long, password unchanged Your password does not meet the minimum length requirement specified in Warning: Only the first 8 characters of the password are significant Your password exceeds the maximum length requirement specified in Permission denied You do not have the privilege to change your password. The minimum lifetime has not expired. Password is not different enough, unchanged Your new password must be different from your old password. Password must be different than logname, and not resemble previous password Your new password must be different from your login name. Verification failed, password unchanged You misspelled the verification of your new password. Files Password file Authorization data base directory Authorization data base page Data base service selection and security configuration file Only the superuser and members of the group can access the and files. See Also chfn(1), chsh(1), finger(1), login(1), shexp(1), yppasswd(1yp), passwd(5yp), edauth(8), vipw(8) Guide to System Environment Setup Security Guide for Users Security Guide for Administrators "Password Security: A Case History", Supplementary Documents, Volume 3: System Manager passwd(1)
