By Eric Foster-Johnson, John C. Welch, Micah Anderson
* overlaying all significant platforms-Linux, Unix, Mac OS X, and Windows-this advisor exhibits programmers and gear clients how you can customise an working approach, automate instructions, and simplify management initiatives utilizing shell scripts* bargains entire shell-scripting directions, strong code examples, and entire scripts for OS customization* Covers shells as a person interface, easy scripting concepts, script modifying and debugging, graphing information, and simplifying administrative initiatives* as well as Unix and Linux scripting, the publication covers the newest home windows scripting innovations and provides an entire instructional on Mac OS X scripting, together with distinctive insurance of cellular dossier structures, legacy purposes, Mac textual content editors, video captures, and the Mac OS X Open Scripting structure
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Extra info for Beginning Shell Scripting (Programmer to Programmer)
Unless you want to accidentally delete files, you should include a number of characters when running a command from the history. The Korn shell supports a command history as well but uses the r command instead of an exclamation mark. Like the C shell, you may need to set up the history feature first, but set the HISTSIZE value instead of the C shell’s history: $ HISTSIZE=60 Once set up, run the fc command (short for fix command) to view the history, with the -l (ell) option: $ fc -l 1 set -o vi 2 fc 3 pwd 4 pwd 5 fc -l The fc command can also call up an editor.
In fact, you can ask the shell to keep an entire history of the commands you typed in, as the up and down arrows show. The command-history feature originated with the C shell. The Korn shell uses a different syntax, and bash supports both the C shell and the Korn shell syntaxes. In the C shell, you can enable the command history with a command like the following: $ set history=60 This command tells the C shell to store the 60 previous commands in its history. When the history list fills, the shell will dump the oldest entry to make room for a new entry.
The next chapter takes you from shells to shell scripting. 38 2 Introducing Shell Scripts Chapter 1 introduced the shell, a program that patiently awaits your input in the form of commands. These commands range from a simple ls command to complex command lines made up of multiple commands. Each shell, such as bash, ksh, or csh, requires a slightly different syntax for entering commands, although the basics are very similar. Commands often require command-line options as arguments. All of this can make for complex commands.