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PS (1) > $dll=$txt=$log=0
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Now we run the actual switch statement. This switch statement uses wildcard patterns to match the extensions on the filenames. The associated actions increment a variable for each extension type:
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PS (2) > switch -wildcard (dir c:\windows) >> {*.dll {$dll++} *.txt {$txt++} *.log {$log++}}
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Once we have the totals, let s display them:
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PS (3) > "dlls: $dll text files: $txt log files: $log" dlls: 6 text files: 9 log files: 120
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Note that in this example the pipeline element is being matched against every clause. Since a file can t have more than one extension, this doesn t affect the output, but it does affect performance somewhat. It s faster to include a continue statement after each clause so the matching process stops as soon as the first match succeeds. Here s something else we glossed over earlier in our discussion of $_ it always contains the object that was matched against. This is important to understand when you re using the pattern matching modes of the switch statement. The pattern matches create a string representation of the object to match against, but $_ is still bound to the original object. Here s an example that illustrates this point. This is basically the same as the last example, but this time, instead of counting the number of files, we want to calculate the total size of all of the files having a particular extension. Here are the revised commands:
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PS (1) > $dll=$txt=$log=0 PS (2) > switch -wildcard (dir) { >> *.dll {$dll+= $_.length; continue} >> *.txt {$txt+=$_.length; continue} >> *.log {$log+=$_.length; continue} >> } >> PS (3) > "dlls: $dll text files: $txt log files: $log" dlls: 166913 text files: 1866711 log files: 6669437 PS (4) >
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Notice how we re using $_.length to get the length of the matching file object. If $_ were bound to the matching string, we would be counting the length of the file names instead of the lengths of the actual files. 6.7.4 Processing files with the switch statement There is one last mode of operation for the switch statement to discuss: the -file option. Instead of specifying an expression to iterate over as the switch value, the -file option allows you to name a file to process. Here s an example where we re processing the Windows update log file. Again we start by initializing the counter variables:
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PS (1) > $au=$du=$su=0
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Next we use the -regex and -file options to access and scan the file WindowsUpdate.log, looking update requests from automatic updater, Windows Defender, and SMS triggered updates.
PS (2) > switch -regex -file c:\windows\windowsupdate.log { >> 'START.*Finding updates.*AutomaticUpdates' {$au++} >> 'START.*Finding updates.*Defender' {$du++}
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>> 'START.*Finding updates.*SMS' {$su++} >> } >>
Finally we print out the results.
PS (3) > "Automatic:$au Defender:$du SMS:$su" Automatic:195 Defender:10 SMS:34
Now it s possible to do basically the same thing by using Get-Content or even the filesystem name trick we looked at in chapter 4:
PS (4) > $au=$du=$su=0 PS (5) > switch -regex (${c:windowsupdate.log}) { >> 'START.*Finding updates.*AutomaticUpdates' {$au++} >> 'START.*Finding updates.*Defender' {$du++} >> 'START.*Finding updates.*SMS' {$su++} >> } >> PS (6) > "Automatic:$au Defender:$du SMS:$su" Automatic:195 Defender:10 SMS:34
Here we used ${c:windowsupdate.log} to access the file content instead of file. So why have the -file option There are two reasons. The -file operation reads one line at a time, so it uses less memory than GetContent, which has to read the entire file into memory before processing. Also, because -file is part of the PowerShell language, the interpreter can do some optimizations, which gives -file some performance advantages. So overall, the -file option can potentially give you both speed and space advantages in some cases (the space advantage typically being the more significant, and therefore more important of the two). 6.7.5 Using the $switch loop enumerator in the switch statement One more point: just as the foreach loop used $foreach to hold the loop enumerator, the switch statement uses $switch to hold the switch loop enumerator. This is useful in a common pattern processing a list of options. Say we have a list of options where the option -b takes an argument and -a, -c, and -d don t. Let s write a switch statement to process a list of these arguments. First let s set up a list of test options. For convenience, we ll start with a string and then use the string split() method to break it into an array of elements:
PS (1) > $options="-a -b Hello -c".split()
Next let s initialize the set of variables that will correspond to the flags:
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