aggiunge esercitazioni powershell

compiti_per_casa/es_18.ps1

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+get-help about_escape_character | tee "Escape"

compiti_per_casa/es_19.ps1

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+Foreach-Object { Start-Process -FilePath "*at" �Verb Print}

compiti_per_casa/es_24.ps1

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+get-alias | format-table -property Name, Definition | out-file C:\Users\alessandro.gori\Desktop\Esercizio24

compiti_per_casa/es_27.ps1

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+$par = $args
+if($par -gt  10) 
+{echo ";Maggiore di 10"}
+ else   
+{echo "Minore di 10"}

compiti_per_casa/es_30.ps1

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+$par = $args[0]
+$vet = 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39
+$cont = 0
+for($i = 0; $i -le 20; $i++)
+{
+	if($vet[$i] -gt $par)
+	{
+		$cont ++
+	}
+}
+write-host "$cont"

compiti_per_casa/es_33.ps1

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+$N = $args[1]
+
+switch ($args[0])
+{
+	"S" {$N ++
+	     write-host "$N"}
+	"P" {$N --
+	     write-host "$N"}
+	"D" {$N = $N * 2
+	     write-host "$N"}
+	"M" {$N = $N /2
+	     write-host "$N"}
+	default {Write-host "S = Successivo"
+		 Write-host "P = Precedente"
+		 Write-host "D = Doppio"
+		 Write-host "M = Met�"}
+}