Add File Input Output in PowerShell (#4720)

Author: rzuckerm

archive/p/powershell/FileInputOutput.ps1

@@ -0,0 +1,39 @@
+function Set-File([string]$Filename) {
+    try {
+        $StreamWriter = [IO.StreamWriter]::new($FileName)
+        $StreamWriter.WriteLine("Hello, PowerShell!")
+        $StreamWriter.WriteLine("A line here")
+        $StreamWriter.WriteLine("A line there")
+        $StreamWriter.WriteLine("Goodbye, PowerShell!")
+        $true
+    } catch {
+        Write-Host "Cannot write to file ${Filename}: $($_.Exception.Message)"
+        $false
+    } finally {
+        if ($StreamWriter) {
+            $StreamWriter.Close()
+            $StreamWriter.Dispose()
+        }
+    }
+}
+
+function Get-File([string]$Filename) {
+    try {
+        foreach ($Line in Get-Content -Path $Filename -ErrorAction Stop) {
+            Write-Host $Line
+        }
+        $true
+    } catch {
+        Write-Host "Cannot read from file ${Filename}: $($_.Exception.Message)"
+        $false
+    }
+}
+
+$Filename = "output.txt"
+if (-not (Set-File($Filename))) {
+    Exit 1
+}
+
+if (-not (Get-File($Filename))) {
+    Exit 1
+}