Download A First Course in Database Systems (3rd Edition) by Jeffrey D. Ullman PDF

By Jeffrey D. Ullman

Overseas reprint variation. Paperback. released in China. Contents in ENGLISH and absolutely related as US variation.

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Extra resources for A First Course in Database Systems (3rd Edition)

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The func‐ tion fac could not have been defined using an alias because of the parameter. Still, aliases allow you to save lots of keystrokes. bash_aliases configuration files, which are located in your home directory. To see all aliases currently defined, you simply run alias without arguments. Try it, what do you see? In this book, when it comes to creating new command-line tools, we’ll focus mostly on the last three types: interpreted scripts, shell functions, and aliases. This is because these can easily be changed.

5. Add a parameter. 6. Optionally extend your PATH. Converting One-Liners into Shell Scripts | 43 Step 1: Copy and Paste The first step is to create a new file. Open your favorite text editor and copy and paste our one-liner. sh (the 1 stands for the first step towards our new command-line tool) and put it in the ~/book/ch04 directory, but you may choose a different name and location. The contents of the file should look something like Example 4-1. Example 4-1. sh to make clear that we’re creating a shell script.

If you often find yourself executing a certain command with the same parameters (or a part of it), you can define an alias for this. Aliases are also very useful when you continue to misspell a certain command (see his GitHub profile for a long list of useful aliases). The following commands define two aliases: Essential Concepts and Tools | 21 $ alias l='ls -1 --group-directories-first' $ alias moer=more Now, if you type the following on the command line, the shell will replace each alias it finds with its value: $ cd ~ $ l book Aliases are simpler than shell functions as they don’t allow parameters.

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