diff --git a/cat.nim b/cat.nim
index 5dd19a9..72d8a3a 100644
--- a/cat.nim
+++ b/cat.nim
@@ -18,9 +18,8 @@ proc catFile(file:string) =
             break
 
 proc catStdin() =
-    var line = ""
-    while stdin.readLine(line):
-        echo line
+    for line in lines(stdin):
+        writeLine(stdout, line)
 
 proc main(files:seq[string]) =
     if files.len == 0:
diff --git a/nimbase.nimble b/nimbase.nimble
index aab2915..5ce89db 100644
--- a/nimbase.nimble
+++ b/nimbase.nimble
@@ -8,6 +8,6 @@ requires      "nim >= 0.19.0"
 requires      "cligen >= 0.9.19"
 requires      "stint >= 0.0.1"
 
-bin           = @["add", "cat", "cp", "div", "echo", "factor", "false", "head", "mkdir", "mul", "nl", "pwd", "rm", "seq", "shuf", "sleep", "sub", "tac", "tee", "touch", "true", "yes"]
+bin           = @["add", "cat", "cp", "div", "echo", "factor", "false", "head", "mkdir", "mul", "nl", "pwd", "rev", "rm", "seq", "shuf", "sleep", "sub", "tac", "tee", "touch", "true", "yes"]
 
 binDir        = "bin"
diff --git a/rev.nim b/rev.nim
index e69de29..77606f0 100644
--- a/rev.nim
+++ b/rev.nim
@@ -0,0 +1,26 @@
+import cligen, os, streams, unicode
+import common
+
+proc catFile(file:string) =
+    if not existsFile(file):
+        err "rev: " & file & ": No such file or directory"
+        system.quit 1
+    var
+        f = open(file, fmRead)
+    for line in lines(f):
+        writeLine(stdout, reversed(line))
+
+proc catStdin() =
+    for line in lines(stdin):
+        writeLine(stdout, reversed(line))
+
+proc main(files:seq[string]) =
+    if files.len == 0:
+        catStdin()
+    for file in files:
+        if file == "-":
+            catStdin()
+        else:
+            catFile(file)
+
+dispatch(main, version=("version", nimbaseVersion))
diff --git a/sleep.nim b/sleep.nim
index d7e37c2..cd6928d 100644
--- a/sleep.nim
+++ b/sleep.nim
@@ -1,6 +1,9 @@
 import os, cligen, sequtils
 import common
 
+proc timeToSecs(time:string): int =
+    result = 0
+
 proc main(secs:seq[int]) =
     sleep(secs.foldl(a + b) * 1000)