UNIX Unleashed: System Administrator's Edition by Robin Burk
By Robin Burk
UNIX Unleashed, procedure Administrator s version and UNIX Unleashed, net variation are an in-depth exam of the UNIX working approach. Written through specialists, they comprise real-world examples, definitions, information and methods. among them, those variants disguise the specifics of the preferred UNIX editions and using UNIX as a full-fledged web server platform.* whole and complete; no different publication has this a lot breadth, intensity and real-world examples* Covers & compares SVR4, HP-UX, Solaris, AIX, and likewise BSD, IRIX, SunOS, Linux management* is helping the reader come to a decision which Shell works top for him/her: Bourne, Bourne back, Kern or C?"
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If your current directory is /u/guhas, mkdir temp will create a sub-directory called temp under the directory temp whose absolute pathname is /u/guhas/temp. mkdir /u/guhas/temp can also be used to have the same effect as the previous one. /temp can be used to create the directory /u/temp. This example uses .. (two consecutive periods) as part of the relative pathname to indicate that the directory temp will be created under the directory one level up, which is /u. Using mkdir, it is possible to create more than one directory at a time.
In these files, the data is organized into records. If, for example, this book were a file containing data about UNIX operating systems, each line in this book would be called a record. How does UNIX know about these records? The answer is that there is a special character, called a newline character, which is used by UNIX to find out where a record ends and the next one starts. As you will see later, most of the UNIX commands support text processing. However, keep in mind that text files are not the only type of regular files.
CAUTION: If a user has write permissions to a directory containing a file, the permissions of the files in that directory are overridden by permissions of the directory. Permissions (for owners, groups, and others) are stored in the UNIX system in octal numbers. An octal number is stored in UNIX system using three bits so that each number can vary from 0 through 7. Following is how a octal number is stored: ● ● ● Bit 1, value 0 or 1 (defines read permission) Bit 2, value 0 or 1 (defines write permission) Bit 3, value 0 or 1 (defines execute permission) The first bit (read) has a weight of 4, the second bit (write) has a weight of 2, and the third bit (execute) has a weight of 1.