2d barcode reader java Mike Meyers A+ Guide to Managing and Troubleshooting PCs in Software

Printing QR Code in Software Mike Meyers A+ Guide to Managing and Troubleshooting PCs

Mike Meyers A+ Guide to Managing and Troubleshooting PCs
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Their power and utility make the DEL, COPY/MOVE, and XCOPY commands indispensable for a PC technician, but that same power and utility can cause disaster Only a trained Jedi, with The Force as his ally well, wrong book, but the principle remains: Beware of the quick and easy keystroke, for it may spell your doom Think twice and execute the command once The data you save may be yours!
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Working with Batch Files
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Batch files are nothing more than text files that store a series of commands, one command per line The only thing that differentiates a batch file from any other text file is the BAT extension Take a look at Figure 1417 and note the unique icon used for a batch file compared to the icon for a regular text file You can create and edit batch files using any text editor program good old Notepad is often the tool of choice This is the command-line chapter, though, so it s time to dust off the ancient but still important Edit program it comes with every version of Windows and use it to create and edit batch files
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Figure 1417
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Edit
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Get to a command prompt on any Windows system and use the CD\ command to get to the root directory (use C: to get to the C: drive if you re not on the C: drive by default) From there, type EDIT at the command prompt to see the Edit program s interface (Figure 1418) Now that you ve started Edit, type in the two commands as shown in Figure 1419 Make sure they look exactly the same as the lines in Figure 1419 Great! You have just made your first batch file! All you need to do now is save it with some name the name doesn t matter, but this example uses FIRST as the filename It is imperative, however, that you use the extension BAT Even though you could probably figure this out on your own later, do it now Hold down the ALT key to activate the menu Press the F (File) key Then press S (Save) Type in the name firstbat as shown in Figure 1420 Press ENTER and the file is now saved
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Figure 1418
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Figure 1419
Edit with two commands
14: Working with the Command-Line Interface
Figure 1420
Saving the batch file
Most of the keyboard shortcuts used in WordPad, Word, and so on, were first used in the Edit program If you know keyboard shortcuts for WordPad or Word, many will work in Edit
Now that you ve saved the file, exit the Edit program by pressing ALT-F and then press X (Exit) You re back at the command prompt Go ahead and run the program by typing FIRST and pressing ENTER Your results should look something like Figure 1421 Super! The batch file created a folder and moved the prompt to focus on that folder Don t run the first batch file again or you ll create another folder inside the first one! Now get back to the root directory of C: and edit the FIRSTBAT file again This time type EDIT FIRSTBAT and press ENTER The batch file will come up, ready to edit Now change the batch file to look like Figure 1422 Use the arrow keys to move your cursor and the DELETE key to delete The VER command shows the current version of Windows The ECHO command tells the batch file to put text on the screen Run the batch file, and it should look like Figure 1423 Gee, that s kind of ugly Try editing the FIRSTBAT file one more time and add the line
@echo off
Don t try using the TYPE command on anything other than a text file the results will be unpredictable
as the first line of the batch file Run FIRSTBAT again It should look quite a bit nicer! The echo off command tells the system not to show the command, just the result Sometimes you just want to look at a batch file The TYPE command displays the contents of a text file on the screen, as shown in Figure 1424
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