diff --git a/amm/interp/src/main/scala/ammonite/interp/Interpreter.scala b/amm/interp/src/main/scala/ammonite/interp/Interpreter.scala
index 65fd98de3..8d368ce57 100644
--- a/amm/interp/src/main/scala/ammonite/interp/Interpreter.scala
+++ b/amm/interp/src/main/scala/ammonite/interp/Interpreter.scala
@@ -362,7 +362,10 @@ class Interpreter(val printer: Printer,
         )
 
 
-        val cachedScriptData = storage.classFilesListLoad(codeSource.filePathPrefix, tag)
+        val cachedScriptData = storage.classFilesListLoad(
+          os.sub / codeSource.filePathPrefix,
+          tag
+        )
 
 
         // Lazy, because we may not always need this if the script is already cached
@@ -398,7 +401,7 @@ class Interpreter(val printer: Printer,
           )
         } yield {
           storage.classFilesListSave(
-            codeSource.filePathPrefix,
+            os.sub / codeSource.filePathPrefix,
             metadata.blockInfo,
             tag
           )
diff --git a/amm/runtime/src/main/scala/ammonite/runtime/Storage.scala b/amm/runtime/src/main/scala/ammonite/runtime/Storage.scala
index 5e6330822..136d0dcc2 100644
--- a/amm/runtime/src/main/scala/ammonite/runtime/Storage.scala
+++ b/amm/runtime/src/main/scala/ammonite/runtime/Storage.scala
@@ -26,10 +26,10 @@ trait Storage{
 
   def compileCacheSave(path: String, tag: Tag, data: Storage.CompileCache): Unit
   def compileCacheLoad(path: String, tag: Tag): Option[Storage.CompileCache]
-  def classFilesListSave(filePathPrefix: os.RelPath,
+  def classFilesListSave(filePathPrefix: os.SubPath,
                          perBlockMetadata: Seq[ScriptOutput.BlockMetadata],
                          tag: Tag): Unit
-  def classFilesListLoad(filePathPrefix: os.RelPath, tag: Tag): Option[ScriptOutput]
+  def classFilesListLoad(filePathPrefix: os.SubPath, tag: Tag): Option[ScriptOutput]
   def getSessionId: Long
 }
 
@@ -160,14 +160,14 @@ object Storage{
       } yield data
     }
 
-    def classFilesListSave(filePathPrefix: os.RelPath,
+    def classFilesListSave(filePathPrefix: os.SubPath,
                            perBlockMetadata: Seq[ScriptOutput.BlockMetadata],
                            tag: Tag): Unit = {
 
       classFilesListcache(filePathPrefix.toString) = (tag, perBlockMetadata)
     }
 
-    def classFilesListLoad(filePathPrefix: os.RelPath,
+    def classFilesListLoad(filePathPrefix: os.SubPath,
                            cacheTag: Tag): Option[ScriptOutput] = {
 
       classFilesListcache.get(filePathPrefix.toString) match{
@@ -218,7 +218,7 @@ object Storage{
     }
 
 
-    def classFilesListSave(filePathPrefix: os.RelPath,
+    def classFilesListSave(filePathPrefix: os.SubPath,
                            perBlockMetadata: Seq[ScriptOutput.BlockMetadata],
                            tag: Tag): Unit = {
 
@@ -246,7 +246,7 @@ object Storage{
       catch{ case e: Throwable => None }
     }
 
-    def classFilesListLoad(filePathPrefix: os.RelPath,
+    def classFilesListLoad(filePathPrefix: os.SubPath,
                            tag: Tag): Option[ScriptOutput] = {
 
       val codeCacheDir =
diff --git a/amm/src/test/scala/ammonite/main/MainTests.scala b/amm/src/test/scala/ammonite/main/MainTests.scala
index c60aa42c2..fc22a6a58 100755
--- a/amm/src/test/scala/ammonite/main/MainTests.scala
+++ b/amm/src/test/scala/ammonite/main/MainTests.scala
@@ -10,8 +10,8 @@ import utest._
   * and the associated error behavior if the caller messes up.
  */
 object MainTests extends TestSuite{
-  def exec(p: os.RelPath, args: String*) =
-    new InProcessMainMethodRunner(os.rel / 'mains/p, Nil, args)
+  def exec(p: String, args: String*) =
+    new InProcessMainMethodRunner(os.rel / 'mains / p, Nil, args)
 
   def stripInvisibleMargin(s: String): String = {
     val lines = Predef.augmentString(s).lines.toArray
diff --git a/build.sc b/build.sc
index 9a48a956a..88937ff7d 100644
--- a/build.sc
+++ b/build.sc
@@ -132,7 +132,7 @@ trait AmmDependenciesResourceFileModule extends JavaModule{
 object ops extends Cross[OpsModule](binCrossScalaVersions:_*)
 class OpsModule(val crossScalaVersion: String) extends AmmModule{
   def ivyDeps = Agg(
-    ivy"com.lihaoyi::os-lib:0.3.0",
+    ivy"com.lihaoyi::os-lib:0.4.2",
     ivy"org.scala-lang.modules::scala-collection-compat:2.1.2"
   )
   def scalacOptions = super.scalacOptions().filter(!_.contains("acyclic"))
diff --git a/integration/src/test/scala/ammonite/integration/BasicTests.scala b/integration/src/test/scala/ammonite/integration/BasicTests.scala
index cf504defd..495a55bad 100644
--- a/integration/src/test/scala/ammonite/integration/BasicTests.scala
+++ b/integration/src/test/scala/ammonite/integration/BasicTests.scala
@@ -26,7 +26,10 @@ object BasicTests extends TestSuite{
       "-h",
       home,
       replStandaloneResources/name
-    ).call(env = Map("JAVA_OPTS" -> "-verbose:class"))
+    ).call(
+      env = Map("JAVA_OPTS" -> "-verbose:class"),
+      stderr = os.Pipe
+    )
 
     test("hello"){
       val evaled = exec(os.rel / 'basic/"Hello.sc")
diff --git a/integration/src/test/scala/ammonite/integration/TestUtils.scala b/integration/src/test/scala/ammonite/integration/TestUtils.scala
index 45405e9b6..287f60200 100644
--- a/integration/src/test/scala/ammonite/integration/TestUtils.scala
+++ b/integration/src/test/scala/ammonite/integration/TestUtils.scala
@@ -33,7 +33,10 @@ object TestUtils {
       home,
       replStandaloneResources / name,
       args
-    ).call(env = Map("JAVA_OPTS" -> null))
+    ).call(
+      env = Map("JAVA_OPTS" -> null),
+      stderr = os.Pipe
+    )
   }
   def exec(name: RelPath, args: String*) =
     execBase(name, Nil, tmp.dir(), args, thin = true)
diff --git a/ops/src/main/scala-2.12/ammonite/ops/LsSeq.scala b/ops/src/main/scala-2.12/ammonite/ops/LsSeq.scala
index 3ca250890..57357bf30 100644
--- a/ops/src/main/scala-2.12/ammonite/ops/LsSeq.scala
+++ b/ops/src/main/scala-2.12/ammonite/ops/LsSeq.scala
@@ -7,5 +7,5 @@ package ammonite.ops
 case class LsSeq(base: Path, listed: RelPath*) extends Seq[Path]{
   def length = listed.length
   def apply(idx: Int) = base/listed.apply(idx)
-  def iterator = listed.iterator.map(base/)
+  def iterator = listed.iterator.map(base / _)
 }
diff --git a/ops/src/main/scala-2.13/ammonite/ops/LsSeq.scala b/ops/src/main/scala-2.13/ammonite/ops/LsSeq.scala
index 22b2dd4b5..884bb7ade 100644
--- a/ops/src/main/scala-2.13/ammonite/ops/LsSeq.scala
+++ b/ops/src/main/scala-2.13/ammonite/ops/LsSeq.scala
@@ -9,7 +9,7 @@ import scala.collection.generic.IsIterable
 case class LsSeq(base: Path, listed: RelPath*) extends Seq[Path]{
   def length = listed.length
   def apply(idx: Int) = base/listed.apply(idx)
-  def iterator = listed.iterator.map(base/)
+  def iterator = listed.iterator.map(base / _)
 }
 
 object LsSeq {
diff --git a/ops/src/main/scala/ammonite/ops/package.scala b/ops/src/main/scala/ammonite/ops/package.scala
index dcb9484e7..39cc934e6 100644
--- a/ops/src/main/scala/ammonite/ops/package.scala
+++ b/ops/src/main/scala/ammonite/ops/package.scala
@@ -31,7 +31,7 @@ package object ops extends Extensions {
   object stat extends Function1[Path, os.StatInfo]{
     def apply(s: Path, followLinks: Boolean = true) = os.stat(s, followLinks)
     def apply(s: Path) = os.stat(s)
-    val full = os.stat.full
+    val posix = os.stat.posix
   }
   implicit def SymPath(s: Symbol): RelPath = StringPath(s.name)
   implicit def StringPath(s: String): RelPath = {
@@ -114,7 +114,8 @@ package object ops extends Extensions {
     * normally access through [[stat]]-ing it by [[stat]]-ing the file for you
     * when necessary.
     */
-  implicit def fileData(p: Path): os.FullStatInfo = stat.full(p)
+  implicit def statFileData(p: Path): os.StatInfo = stat(p)
+  implicit def posixFileData(p: Path): os.PosixStatInfo = stat.posix(p)
 
   /**
     * Used to spawn a subprocess interactively; any output gets printed to the
diff --git a/ops/src/test/scala/test/ammonite/ops/ExampleTests.scala b/ops/src/test/scala/test/ammonite/ops/ExampleTests.scala
index 76282f30b..e1478c31f 100644
--- a/ops/src/test/scala/test/ammonite/ops/ExampleTests.scala
+++ b/ops/src/test/scala/test/ammonite/ops/ExampleTests.scala
@@ -102,12 +102,6 @@ object ExampleTests extends TestSuite{
       // Ammonite provides an implicit conversion from `Path` to
       // `stat`, so you can use these attributes directly
       (wd/"file1.txt").size ==> 20
-
-      // You can also use `stat.full` which provides more information
-      val fullInfo = stat.full(wd/"file1.txt")
-      fullInfo.ctime: FileTime
-      fullInfo.atime: FileTime
-      fullInfo.group: GroupPrincipal
       ()
     }
     test("longExample"){
diff --git a/readme/Ops.scalatex b/readme/Ops.scalatex
index 9d830a3c1..83de41098 100644
--- a/readme/Ops.scalatex
+++ b/readme/Ops.scalatex
@@ -194,7 +194,7 @@
         @li
           @hl.scala{stat! path}, @a("[doc]", href := (docBase+ "stat$"))
         @li
-          @hl.scala{stat.full! path}, @a("[doc]", href := (docBase+ "stat$$full$"))
+          @hl.scala{stat.posix! path}, @a("[doc]", href := (docBase+ "stat$$posix$"))
         @li
           @hl.scala{ln(src, dest)}, @a("[doc]", href := (docBase+ "ln$"))
         @li
diff --git a/shell/src/test/scala/ammonite/shell/SessionTests.scala b/shell/src/test/scala/ammonite/shell/SessionTests.scala
index 203e14146..ed9d76552 100644
--- a/shell/src/test/scala/ammonite/shell/SessionTests.scala
+++ b/shell/src/test/scala/ammonite/shell/SessionTests.scala
@@ -185,9 +185,9 @@ object SessionTests extends TestSuite{
 
         @ assert(!stat('test132).isDir && !stat('test132).isSymLink && stat('test130).isDir)
 
-        @ assert(!stat.full('test132).isDir && !stat.full('test132).isSymLink)
+        @ assert(!stat('test132).isDir && !stat('test132).isSymLink)
 
-        @ assert(stat.full('test130).isDir)
+        @ assert(stat('test130).isDir)
 
         @ assert(ls.rec(wd).length == 5)
 
@@ -217,11 +217,11 @@ object SessionTests extends TestSuite{
 
         @ assert(!stat(t/'test132).isDir && !stat(t/'test132).isSymLink)
 
-        @ assert(!stat.full(t/'test132).isDir && !stat.full(t/'test132).isSymLink)
+        @ assert(!stat(t/'test132).isDir && !stat(t/'test132).isSymLink)
 
         @ assert(stat(t/'test130).isDir && stat(t, followLinks = false).isSymLink)
 
-        @ assert(stat.full(t/'test130).isDir && stat.full(t, followLinks = false).isSymLink)
+        @ assert(stat(t/'test130).isDir && stat(t, followLinks = false).isSymLink)
 
         @ rm! tmpdir
       """)