barcode vb.net code PS PS 3 PS 22 PS 3 (1) > $a = 3 (2) > $a (3) > & { $a = 22; $a } (4) > $a in C#.NET

Creation Code 39 Extended in C#.NET PS PS 3 PS 22 PS 3 (1) > $a = 3 (2) > $a (3) > & { $a = 22; $a } (4) > $a

PS PS 3 PS 22 PS 3 (1) > $a = 3 (2) > $a (3) > & { $a = 22; $a } (4) > $a
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In this example, in the outer scope, we set the value of $a to 3 and then display it. Then we use the & operator and braces to create an nested scope. In this nested scope, we define a new value for $a 22 then display this new value. Once we exit the local scope, we again display the value of $a, which is the original value of 3. A.1.4 Differences in syntax The PowerShell syntax is obviously quite different from cmd.exe, but beyond basic syntax, there are some significant differences in the way commands are processed. One thing that a lot of people coming from cmd.exe find annoying is that in cmd.exe, APPENDIX A: COMPARING POWERSHELL
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you don t have to put spaces between built-in commands and their arguments. This means that you can issue commands like the following:
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C:\>cd\windows C:\WINDOWS>cd.. C:\>dir\files\a.txt Volume in drive C is C_Drive Volume Serial Number is F070-3264 Directory of C:\files 04/25/2006 10:55 PM 98 a.txt 1 File(s) 98 bytes 0 Dir(s) 94,158,913,536 bytes free
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and they work just fine. However, in PowerShell they will result in errors:
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PS (1) > cd\windows The term 'cd\windows' is not recognized as a cmdlet, functi on, operable program, or script file. Verify the term and t ry again. At line:1 char:10 + cd\windows <<<< PS (2) > cd.. The term 'cd..' is not recognized as a cmdlet, function, op erable program, or script file. Verify the term and try aga in. At line:1 char:4 + cd.. <<<<
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Commands can be used this way in cmd.exe because it treats its built-in commands as special cases and doesn t require spaces to separate the commands from the arguments. PowerShell doesn t have any special built-in commands all commands are treated the same. This allows for greater consistency in PowerShell and, down the road, greater extensibility. But that doesn t help all of the people who have cd.. or cd\ burned into their finger-memory . For people who find it to be a real problem, it s possible to define functions to work around the difficulty. Let s define a couple of these functions as an example:
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PS (1) > function cd.. { cd .. } PS (2) > function cd\ { cd \ }
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Now we ll try them out. First we cd into the root of the filesystem, then into the filesystem, and finally back to the root.
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PS (3) > cd\ PS (4) > cd windows PS (5) > cd..
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APPENDIX A: COMPARING POWERSHELL
This works around some of the problems, but it doesn t fix everything. We still had to put a space between cd and windows . Even so, many people do find this approach useful. If we want to make these functions available every time we start PowerShell, we can put them in our personal profile, which is named by the variable $PROFILE. Run
notepad $profile
Add the definitions you want to have available and then save the file. The next time you start PowerShell, the functions you ve defined in the profile will be available. A.1.5 Searching text: findstr and Select-String A common command for searching through files from cmd.exe is findstr.exe. (Note that since it s an external command, it will also work just fine from PowerShell.) PowerShell has a similar command, Select-String. So why have a new cmdlet when the old executable already works There are a couple reasons. First, the Select-String cmdlet returns objects that include the matching text, the number of the line that matched, and the name of the file as separate fields, making it easier to process the output. Secondly, it uses the .NET regular expression library, which is much more powerful than the patterns findstr can handle. If we look at the help for findstr, we ll see that it actually has a lot of operations that aren t built into Select-String. This is because PowerShell uses a composition model. Instead of building a large but fixed set of operations into one command, there are more small composable commands. For example, to search all of the C# files in all of the subdirectories with findstr, the command is
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