.NET/ASP.NET/C#/VB.NET PDF Document SDK

The problem with using echo statements as I described previously is that you have to comment or remove them when you don t want their output displayed. This is fine if your program is working to perfection and will not need further modification. However, if you re constantly making changes to a script that is actually being used, the need to add back or uncomment echo statements each time you debug can be tiresome. This next debugging technique improves on the basic echo statement by adding a debugging level that can be turned on or off. After you ve prepped your script once, enabling or disabling debugging output is as simple as changing a single variable. The technique is to set a debug variable near the beginning of the script. This variable will then be tested during script execution and the debug statements will be either displayed or suppressed based on the variable s value. The following is our original example, modified once again for this technique:

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Each command is preceded in the output by a number, indicating how far back it was used When you are first assigned an account, you ll get a username and password combination You are free to change your password by using the passwd command Use the pwd command to find out your present working directory or to simply confirm your current location in the file system In the example shown here, the uname command tells you that the machine s symbolic name is prod5 and it s an HP-UX machine The -a option tells UNIX to give all the details of the system If you omit the -a option, UNIX will just respond with HP-UX As the name of this command suggests, whereis will give you the exact location of the executable file for the utility in question.

The which command enables you to find out which version (of possibly multiple versions) of a command the shell is using You should run this command when you run a common command, such as cat, and receive somewhat different results than you expect The which command helps you verify whether you are indeed using the correct version of the command..

By default, SQL*Loader displays feedback messages on the screen showing the load job s progress. You can turn off the display with the SILENT parameter. You can use several options with the SILENT parameter. For example, you can turn off all types of messages with the ALL option, as shown here: SILENT = ALL

The discard file contains all records rejected during the load because they didn t meet the record selection criteria you specified in the control file. The default is to not have a discard file. Oracle will create this file only if there discarded records, and, even then, only if you explicitly specify the discard file in the control file. You use the DISCARD parameter to specify the name and location of the discard file. DISCARD = 'test01/app/oracle/oradata/load/finance.dsc'

If the native library consists of more than one central abstraction, wrapping one-to-one is often a bad idea, because this often results in complications that don t benefit your concrete problem, as well as a significant amount of unused code To find a better task description, you should take a step back and do some thinking to understand the concrete problem To find a description that is more specific than the preceding one, you should especially ask yourself two questions: What subset of the native API is really needed by managed code What are the use cases for which the native API is needed by managed clients Once you know the answers to these questions, you are often able to simplify your task by cutting any features that are not needed and by defining new abstractions that wrap based on use cases.

#!/bin/sh debug=1 test $debug -gt 0 && echo "Debug is on" echo -n "Can you write device drivers " read answer test $debug -gt 0 && echo "The answer is $answer" answer=`echo $answer | tr [a-z] [A-Z]` if [ $answer = Y ] then echo Wow, you must be very skilled test $debug -gt 0 && echo "The answer is $answer" else echo Neither can I, Im just an example shell script test $debug -gt 0 && echo "The answer is $answer" fi