ASP.NET Web PDF Document Viewer/Editor Control Library

Tip It is always worthwhile to check that you are at the right place in the file structure before you press the Enter key, to avoid running any destructive commands. The following commands will help you control your input at the command line. Under the Korn shell, to retrieve the previous command all you have to do is press the Esc key followed by the letter k. If you want an older command, continue typing the letter k, and you ll keep going back in the command sequence. If you have typed a long sequence of commands and wish to edit it, press the Esc key followed by the letter h to go back, or press the letter l to go forward on the typed command line.

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There are many operating system commands, most with several options. Therefore, it s convenient to have a sort of help system embedded right within the operating system so you have the necessary information at your fingertips. UNIX and Linux systems both come with a built-in feature called the man pages, which provide copious information about all the operating system commands. You can look up any command in more detail by typing the man command followed by the command you want information on, as follows: $ man who This command will then display a great deal of information about the who command and all its options, as well as several examples (see Figure 3-2).

In Linux-based systems, you can also use the nifty whatis command to find out what a certain command does. Like the man command, the whatis command is followed by the name of the command you want information about. Here s a simple example: $ whatis whereis (1) -locate the binary, source, and manual page files for a command As you can see, the whatis command offers a quicker and easier way to locate summary information about any command than the more elaborate man pages.

This command preserves the original file s ownership and time stamp for the new copy. Thus the new copy maintains the attributes of the original file and it appears as if the file had been moved. This is also a useful technique when modifying scripts, configuration files, or any other file for which preserving the original file s attributes would be valuable.

Every shell has its own default prompt. The default prompt for the Korn shell is the dollar sign ($). You can easily change it to something else by changing the value of the PS1 shell variable. In the following example, I first check the value of the PS1 variable by issuing the command echo $PS1. I then use the export command to set the value of the ORACLE_SID environment variable to my database name, finance. Using the export command again, I set the value of the PS1 environment variable to be the same as the value of the environment variable ORACLE_SID ($ORACLE_SID). Now the shell prompt is changed to my database name, finance. Since I only exported the ORACLE_SID variable value but didn t place it in my environment files, the value I exported is good only for the duration of the current session. $ echo $PS1 $ $ export ORACLE_SID=finance $ export PS1=[$ORACLE_SID] [finance]

As you saw in the previous sections, creating external tables correctly and choosing the appropriate access parameters can be a tedious task Fortunately, there is an easier way to do all this: you can have SQL*Loader generate the entire DDL for creating the external tables and all the SQL statements to load the tables directly The SQL*Loader command-line parameter EXTERNAL_TABLE will allow you to generate the DDL for creating all your external tables The default value for the EXTERNAL_TABLE parameter is NOT_USED, which means SQL*Loader will perform a normal data load in either the conventional or direct-path loading When you use this parameter with the value GENERATE_ONLY, the SQL*Loader utility does not load any data; rather, SQL*Loader generates all SQL statements necessary to load the external tables described in the control file and places these statements in the SQL*Loader log file.