By Dennis O'Brien
Korn Shell Programming by means of instance is a straight-forward, nuts and bolts ebook that would develop into a customary within the libraries of Unix directors far and wide as a result of its real-life examples, revolutionary type, and shortage of pointless fluff. in keeping with the Korn shell, it really is an important reference for directors on easy methods to software their process, and it's also worthwhile for these new to Unix who want to know how one can automate their approach. such a lot of all, Korn Shell Programming through instance teaches and fingers readers being able to remedy difficulties they may come across.
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Additional resources for Korn shell programming by example
A list of all command-line arguments. 6: continued Variable Explanation $@ An individually double-quoted list of all command-line arguments. PID (process ID) number of the last background command. PID (process ID) number of the current process. A numerical value indicating the exit status of the last executed command. $! $$ $? Environment Variables As already mentioned, the values associated with an environment variable are visible by child processes of the shell. For a variable to be part of the environment, it must be exported to the environment.
The result is that the process running the man command must create a subprocess running an uncompress program of some kind (gunzip in this case) to prepare the data for display. The last thing the man command has to do is actually display the manual page information. Most implementations present the output of the unzip to the UNIX more command. My Linux system uses the less command to do the display work. ) If the output display is longer than one screen’s worth, the less command waits until the user requests the next page.
This is because the shell must first read the file to see what to do with it. ) Other combinations allow certain functionality. 3 describes the combinations of permissions and what they mean, both for a file and for a directory. 3: Comparison of file and directory permission combinations Permission File Directory --- Cannot do anything. r-- Can see the contents. Can see and alter the contents. Can see and change the contents, as well as execute the file. Cannot access it or any of its subdirectories.