tailieunhanh - SAMS Teach Yourself Unix in 10 Minutes phần 8

Bạn có thể sử dụng Ctrl + d để thoát ra khỏi của quá trình và trở về dấu nhắc shell của người là ai? Có rất nhiều nhiều hơn nữa để tìm hiểu về tất cả các lệnh chúng ta đã. Tiếp tục sử dụng các trang người đàn ông của bạn thường xuyên như bạn có thể và giữ ghi nhớ của các lệnh này với một mức phí bảo hiểm nếu bạn muốn tốc độ | 121 this book it s important to mention in case you come across it instead of the passwd command. There are also other syntaxes for the yppasswd command such as uypasswd for example. Because passwords may be stored on multiple machines this utility will update your password on all systems on which you may be working. Check your local man pages for more information on using these commands. To use the passwd command you must first have the proper privileges to make a change. If you are not a SuperUser su passwd will first prompt you for your current password just to make sure you are who you say you are this is a security measure implemented to protect your credentials and Unix will not continue unless the correct password is entered. After you enter your current password you will be asked for your new password as shown in the following example passwd Changing password for rob Old password New password Retype new password Password successfully changed Choose a Good Password Choosing a new password should be something that you take seriously so that you can protect access to your Unix system. Your new password should be at least six characters long and not purely alphabetic. You should use numbers as well as upper- and lowercase letters Unix is case sensitive or special signs such as or @ in your password. Doing so will help keep your password safe. Try to avoid the obvious when choosing your password. For instance if you have pictures of your cat Fluffy all over your office or cubicle then a password of fluffy is not going to keep your Unix system safe. The name of your favorite baseball team or your children s names are also bad choices for passwords unless you enjoy being a victim. Also don t just append a 1 then a 2 and so on to your password when you are forced to change it for example fluffyl fluffy2 fluffy3 and so on . Make sure you always use strong passwords and don t let anyone steal them from you that way you can ensure that nobody uses your passwords for .