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file The problem with this is that every user has the right to open /etc/passwd and view its contents Because this is a serious threat to the security of your system, on a modern Linux system the information on the user account is kept in /etc/passwd, while the encrypted password is stored safely in /etc/shadow, which is only accessible by root Listing 4-2 Local Users Are Defined in /etc/passwd root:x:0:0:root:/root:/bin/bash bin:x:1:1:/bin:/bin/bash daemon:x:2:2:Daemon:/sbin:/bin/bash .. squid:x:31:65534:WWW-proxy squid:/var/cache/squid:/bin/false .. sander:x:500:100:sander:/home/sander:/bin/bash On each line in /etc/passwd a user is defined In these lines, the following fields are used: Username: Each user needs a unique username This name can be no longer than eight characters In /etc/passwd, not only are normal end-users defined but some systemaccounts are created, such as the administrative user root and other accounts like bin, daemon, and many more that are needed to run various processes.

application. The source code is intentionally kept as basic and simple as possible, so that you can focus on the XP technique of developing software in a .NET environment. Apress has many great books on C# and the .NET Framework that you can refer to for thorough coverage of those topics.

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Looking at what it was doing revealed that rather than delivering the page in one go to the user s browser, it was relying on making a lot of Ajax calls back to the server to fetch the content for particular sections of the page Well, that doesn t seem too bad, right Isn t that the point of Ajax Well yes, but in this particular web site s case, it was making anywhere between 100 and 200 separate Ajax calls to build up the page from many different sources This meant that while the page initially appeared to load quickly, the visitor then had to sit there watching his browser slowly grind to a halt as it tried to make all of these asynchronous calls across the Internet to fetch content content that could have quite easily been delivered with the first page fetch.

Password: The second field in /etc/passwd is reserved for the encrypted user password, because on modern Linux distributions the x in this field is used to refer to the encrypted password stored in /etc/shadow If for some reason the x is removed from this field, however, the password will be stored local User identification: On a Linux system, every user needs a unique user identification number (UID) Normally, the first UID used for a normal user is 500, while the last UID that can be used for a normal user is 65533 The user root always uses UID 0 It s very important that UIDs remain unique on your server Primary group: On a UNIX system, every user must be a member of at least one group This is the primary group In this field, you ll find the group identification number (GID).

So, although you should not be afraid of using Ajax in your application, make sure that you re using it in the right places and for the right reasons It s great to have a web site that makes people say Oooooh! But people can also quickly tire of an application if it seems that it is more style over substance At the end of the day, your application needs to be functional from the user s perspective Using Ajax can help you to make your application more functional and responsive from the user s perspective, but if you overuse it, it can also lead to a decrease in functionality, with the user sitting there waiting for all your whizzy Ajax routines to stop doing what they re doing..

It s possible to make a UNIX user member of more than one group, but the system isn t made for that, so it s awkward to make a user a member of more than one group The groups are defined in the file /etc/group and it s very common to have all the users be members of the same group Description: This field is used to describe the user Compare this field to the full name field for an eDirectory user Home Directory: This specifies the directory that acts as the user s home directory Normally, this should be a directory on the local Linux system of which the user is owner Shell: For each user a shell must be defined This is the command interpreter that starts when a user logs in to the system from a non-graphical session For normal users, the shell /bin/bash is used.

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