diff --git a/src/pathsd.nim b/src/pathsd.nim
index a6f6f3c..28b75b4 100644
--- a/src/pathsd.nim
+++ b/src/pathsd.nim
@@ -1,4 +1,4 @@
-import std/[algorithm, dirs, logging, options, paths, strutils, syncio]
+import std/[algorithm, dirs, envvars, logging, options, paths, strutils, syncio]
 import strformat
 
 import commandant
@@ -19,6 +19,7 @@ Usage:
   pathsd [options] search_path ...
 Options:
   -s --shell        target shell (defaults to bash)
+  -d --dedupe       deduplicate the final paths
   -v --verbose      turn debugging messages on
   -q --quiet        supress all logging messages
   --version         show the version
@@ -52,7 +53,8 @@ proc readPart(path: Path): seq[string] =
   try:
     var line: string = readLine(pathFile)
     while line != "":
-      result.add(line)
+      if line.startsWith("#") == false:
+        result.add(line)
       line = readLine(pathFile)
   except EOFError as exception:
     discard
@@ -62,7 +64,7 @@ proc readPart(path: Path): seq[string] =
   return result
 
 
-proc main*(searchPaths: seq[string]): MainResult =
+proc main*(searchPaths: seq[string], envParts: seq[string], dedupe: bool): MainResult =
   var parts: seq[string] = @[]
 
   logger.log(lvlDebug, fmt"Processing search paths: {searchPaths}")
@@ -83,6 +85,16 @@ proc main*(searchPaths: seq[string]): MainResult =
     for partPath in partPaths:
       parts = parts & readPart(partPath)
 
+    parts = parts & envParts
+
+    if dedupe == true:
+      var dedupedParts: seq[string] = @[]
+      for part in parts:
+        if dedupedParts.contains(part) == false:
+          dedupedParts.add(part)
+
+      parts = dedupedParts
+
   return MainResult(output: parts, errorCode: QuitSuccess)
 
 
@@ -92,6 +104,7 @@ when isMainModule:
     commandant.option(shell, string, "shell", "s", "bash")
     flag(verbose, "verbose", "v")
     flag(quiet, "quiet", "q")
+    flag(dedupe, "dedupe", "d")
     exitoption("help", "h", help_string, QuitFailure)
     exitoption("version", "", version_string, QuitFailure)
     errorproc(handleCommandantError)
@@ -104,7 +117,11 @@ when isMainModule:
 
   logger.levelThreshold = loggerLevel
 
-  var mainResult = main(searchPaths)
+  var envParts: seq[string] = @[]
+  var envPath = envvars.getEnv("PATH")
+  envParts = envPath.split(":")
+
+  var mainResult = main(searchPaths, envParts, dedupe)
 
   if mainResult.output != @[] and mainResult.errorCode == QuitSuccess:
     var output: string = ""
@@ -112,7 +129,7 @@ when isMainModule:
     case shell
       of "bash":
         let pathComponents = join(mainResult.output, ":")
-        output = fmt"""export PATH="{pathComponents}":$PATH"""
+        output = fmt"""export PATH="{pathComponents}""""
 
     if output != "":
       echo(output)
diff --git a/tests/fixtures/paths.d/01-bilbo b/tests/fixtures/paths.d/01-bilbo
index b097f03..c3cd82e 100644
--- a/tests/fixtures/paths.d/01-bilbo
+++ b/tests/fixtures/paths.d/01-bilbo
@@ -1 +1,2 @@
 /Users/bilbo/opt/bin
+#/Users/bilbo/.local/bin
diff --git a/tests/pathsd/test_main.nim b/tests/pathsd/test_main.nim
index 225b440..2ec1df3 100644
--- a/tests/pathsd/test_main.nim
+++ b/tests/pathsd/test_main.nim
@@ -7,13 +7,17 @@ suite "Test main() proc":
   setup:
     const fixturesPath = Path(currentSourcePath) / Path("..") / Path("..") / Path("fixtures")
     const pathsdFixturePath = fixturesPath / Path("paths.d")
-    const expectedOutput = @["/Users/bilbo/opt/bin", "/opt/homebrew/bin", "/opt/homebrew/sbin"]
+    const envParts = @["/usr/local/bin", "/usr/bin"]
+    const expectedOutput = @[
+      "/Users/bilbo/opt/bin", "/opt/homebrew/bin", "/opt/homebrew/sbin",
+      "/usr/local/bin", "/usr/bin",
+    ]
 
     pathsd.logger.levelThreshold = lvlNone
 
   test "Test happy path":
     # When
-    var mainResult = pathsd.main(@[pathsdFixturePath.string])
+    var mainResult = pathsd.main(@[pathsdFixturePath.string], envParts, false)
 
     # Then
     check mainResult.output == expectedOutput
@@ -21,10 +25,28 @@ suite "Test main() proc":
 
   test "Test skipping search paths that don't exist":
     # When
-    var mainResult = pathsd.main(@[
-      pathsdFixturePath.string,
-      (fixturesPath / Path("idontexist")).string,
-    ])
+    var mainResult = pathsd.main(
+      @[
+        pathsdFixturePath.string,
+        (fixturesPath / Path("idontexist")).string,
+      ],
+      envParts,
+      false,
+    )
+
+    # Then
+    check mainResult.output == expectedOutput
+
+  test "Test dedupe":
+    # Given
+    const localEnvParts = @[
+      "/usr/local/bin", "/usr/bin", "/Users/bilbo/opt/bin",
+    ]
+
+    # When
+    var mainResult = pathsd.main(
+      @[pathsdFixturePath.string], localEnvParts, true,
+    )
 
     # Then
     check mainResult.output == expectedOutput