Download UNIX Workshop by Andreas Pilavakis PDF

By Andreas Pilavakis

This e-book covers the spectrum of UNIX subject matters. it truly is concise and makes use of an outstanding many functional examples. The reader is anticipated to have simple wisdom of at the very least one excessive point language, and for the complicated themes, a operating wisdom of the c program languageperiod is needed.

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There are also a number of awk functions which can be used to manipulate data. Two of the most commonly used functions are: • index(st2,st3) Locates the string "st3" in the string "st2" and returns its position. g. g. 3, the user may define his/her own variables. A variable may be assigned a string or a numeric value; thus the variable type is determined by its assigned value. In the example below, variable 'n' is a numeric variable, whereas variable 'y' is a string variable: n=59 y="Nancy" n= n + 3 Structured programming constructs A number of structured programming language constructs can be used in awk.

20 UNIX Workshop mount device busy during unmounting means either that someone is working on the directory of the disk you are trying to unmount, or that somebody has an open file on that device. A root file system ("/dev/dsk/Osl" in the above example) cannot be unmounted. All other file systems can be unmounted. Thus, for example to unmount the file system "/dev/dsk/lsl" one may use $/etc/umount /dev/dsk/lsl 3 The Bourne Shell The Bourne shell is both an interactive command interpreter and a programming language with user-defined variables and control flow capabilities.

C Example 4 Select the first and fifth columns from the output of the who command. Assuming that the output of the who command is peter tty02 Aug 16 andreas ttyOB Aug 16 rony tty12 Aug 16 14:15 08:12 08:55 the command $who awk '{printf "%s %s\n", $1,$5}' will print peter andreas rony 14:15 08:12 08:55 Example5 From the information about the currently active system processes provided by the ps command, check if a process called "master" is active. If it is active, assign its process number to the variable "pnum" and kill it.

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