Download Beginning Shell Scripting (Programmer to Programmer) by Eric Foster-Johnson, John C. Welch, Micah Anderson PDF

By Eric Foster-Johnson, John C. Welch, Micah Anderson

* overlaying all significant platforms-Linux, Unix, Mac OS X, and Windows-this consultant indicates programmers and gear clients the way to customise an working procedure, automate instructions, and simplify management initiatives utilizing shell scripts * deals whole shell-scripting directions, powerful code examples, and entire scripts for OS customization * Covers shells as a consumer interface, uncomplicated scripting suggestions, script enhancing and debugging, graphing facts, and simplifying administrative projects * as well as Unix and Linux scripting, the publication covers the most recent home windows scripting innovations and gives an entire instructional on Mac OS X scripting, together with special insurance of cellular dossier structures, legacy functions, Mac textual content editors, video captures, and the Mac OS X Open Scripting structure

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Additional resources for Beginning Shell Scripting (Programmer to Programmer)

Sample text

Because a great many shell commands work on files, you can often use a graphical file manager to eliminate the need for a shell. Graphical file manager programs, however, don’t work well for those tasks that shells work best at. For example, if you want to change the case of all the file names in a directory from uppercase to lowercase, shells work far better than file managers. Also, if you want to copy those files that have been modified after a certain date, for a backup perhaps, shells again work better than file managers.

The vi text editor, discussed in the section Learning vi Modes, will wait until you enter the proper cryptic vi command to exit. If you are not familiar with vi, try :q! — that is, colon, q, bang (exclamation point). This will exit the vi command. The shell will then execute the next command in the script3 file, ls in this example. Chapter 9 covers some mechanisms to execute programs and capture the output instead of just waiting for the program to terminate. If for some reason you make a mistake in a shell script file, the shell will quit executing the command and display an error message.

The following Try It Out shows you how to use wildcards. a How It Works Just as if you had entered the ls command at the command line, the asterisks (*) in the argument are expanded by the shell to a list of those files in the /usr/lib directory that start with l (ell), have a z, and end with an a. The shell outputs the results of the command. This is very similar to the wildcard examples in Chapter 1, but this time, you’re using the wildcard expressions inside a script. You have to be careful, however, with the commands you place in your shell scripts.

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