Add touch function to create new empty text file

Define rm to work more like Unix/Linux

* Support -r and -f flags also -rf or -fr
* Support specifying multiple paths to remove

alias.ps1

@@ -1,4 +1,5 @@
-# Remove these aliases to PowerShell builtins which clobber the actaul exes.
-Remove-Item alias:curl
-Remove-Item alias:wget
-# TODO: Remove default abbriviation aliases
+# Remove builtin aliases
+Remove-Item Alias:curl
+Remove-Item Alias:wget
+Remove-Item Alias:cd
+Remove-Item Alias:rm

profile.ps1

@@ -11,4 +11,5 @@ $OutputEncoding = New-Object -typename System.Text.UTF8Encoding
 . $PSScriptRoot\alias.ps1
 . $PSScriptRoot\utils.ps1
 . $PSScriptRoot\layout.ps1
-# TODO: $PSScriptRoot\build.ps1
+# TODO: . $PSScriptRoot\build.ps1
+# TODO: . $PSScriptRoot\autoenv.ps1

utils.ps1

@@ -1,2 +1,44 @@
-# TODO: Define cd to work with zero args for home and - for last directory
-# TODO: Define rm to work with -rf and multiple entries
+# Define cd to work more like Unix/Linux:
+# * No path argument changes to the users home directory
+# * Passing "-" for the path argument changes to the previous directory
+$Global:cdPreviousPath = Get-Location
+function cd {
+  Param ([string]$Path)
+  if ($Path -eq "") {
+    $Path = "~"
+  } elseif ($Path -eq "-") {
+    $Path = $cdPreviousPath
+  }
+  $Global:cdPreviousPath = Get-Location
+  Set-Location -Path $Path
+}
+
+function rm {
+  Param (
+    [Parameter(
+      Mandatory=$true,
+      ValueFromRemainingArguments=$true
+    )][string[]]$Paths,
+    [switch]$F,  [switch]$Force,
+    [switch]$R,  [switch]$Recurse,
+    [switch]$RF, [switch]$FR
+  )
+  $Command = "Remove-Item"
+  if ($F -or $Force -or $RF -or $FR) {
+    $Command = "$Command -Force"
+  }
+  if ($R -or $Recurse -or $RF -or $FR) {
+    $Command = "$Command -Recurse"
+  }
+  foreach ($Path in $Paths) {
+    Invoke-Expression -Command "$Command $Path"
+  }
+}
+
+# Add new aliases
+function touch {
+  Param (
+    [string]$Path
+  )
+  New-Item -Type File $Path
+}