diff --git a/add.nim b/add.nim
index 46c67d2..7d01b92 100644
--- a/add.nim
+++ b/add.nim
@@ -1,6 +1,7 @@
 import cligen, sequtils
+import common
 
 proc main(integers:seq[int]) =
     echo integers.foldl(a + b)
 
-dispatch(main)
+dispatch(main, version=("version", nimbaseVersion))
diff --git a/common.nim b/common.nim
new file mode 100644
index 0000000..d43c8a1
--- /dev/null
+++ b/common.nim
@@ -0,0 +1,4 @@
+# Common constants
+
+const
+    nimbaseVersion* = "0.0.1"
diff --git a/echo b/echo
index 71bd4ca..af8e3b8 100755
Binary files a/echo and b/echo differ
diff --git a/echo.nim b/echo.nim
index b8dbe54..ae894c6 100644
--- a/echo.nim
+++ b/echo.nim
@@ -1,8 +1,9 @@
 import cligen, sequtils
+import common
 
 proc main(strings:seq[string], newline=true) =
     if newline: writeLine(stdout, strings.foldl(a & b))
     else: write(stdout, strings.foldl(a & b))
     flushFile(stdout)
 
-dispatch(main)
+dispatch(main, version=("version", nimbaseVersion))
diff --git a/false.nim b/false.nim
index fbc72bf..f0801ed 100644
--- a/false.nim
+++ b/false.nim
@@ -1,6 +1,7 @@
 import cligen
+import common
 
 proc main() = 
     system.quit(1)
 
-dispatch(main)
+dispatch(main, version=("version", nimbaseVersion))
diff --git a/mul b/mul
index 6a7ed61..1f99eb8 100755
Binary files a/mul and b/mul differ
diff --git a/mul.nim b/mul.nim
index 310c91b..c931f86 100644
--- a/mul.nim
+++ b/mul.nim
@@ -1,6 +1,7 @@
 import cligen, sequtils
+import common
 
 proc main(integers:seq[int]) =
     echo integers.foldl(a * b)
 
-dispatch(main)
+dispatch(main, version=("version", nimbaseVersion))
diff --git a/nimbase.nimble b/nimbase.nimble
index 2d0e9f5..76adcad 100644
--- a/nimbase.nimble
+++ b/nimbase.nimble
@@ -6,4 +6,4 @@ license       = "Unlicense"
 
 requires      "nim >= 0.19.0"
 requires      "cligen >= 0.9.19"
-bin           = @["add", "echo", "false", "mul", "seq", "sleep", "true"]
+bin           = @["add", "echo", "false", "mul", "seq", "sleep", "sub", "true"]
diff --git a/seq.nim b/seq.nim
index 60d10a1..3c0f072 100644
--- a/seq.nim
+++ b/seq.nim
@@ -1,4 +1,5 @@
 import cligen
+import common
 
 proc main(last:int, first=1, increment=1) =
     var i = first
@@ -6,4 +7,4 @@ proc main(last:int, first=1, increment=1) =
         echo(i)
         i = i + increment
 
-dispatch(main)
+dispatch(main, version=("version", nimbaseVersion))
diff --git a/sleep.nim b/sleep.nim
index cd23deb..d7e37c2 100644
--- a/sleep.nim
+++ b/sleep.nim
@@ -1,6 +1,7 @@
 import os, cligen, sequtils
+import common
 
 proc main(secs:seq[int]) =
     sleep(secs.foldl(a + b) * 1000)
 
-dispatch(main)
+dispatch(main, version=("version", nimbaseVersion))
diff --git a/sub b/sub
new file mode 100755
index 0000000..121d2ff
Binary files /dev/null and b/sub differ
diff --git a/sub.nim b/sub.nim
new file mode 100644
index 0000000..ba34c8e
--- /dev/null
+++ b/sub.nim
@@ -0,0 +1,7 @@
+import cligen, sequtils
+import common
+
+proc main(integers:seq[int]) =
+    echo integers.foldl(a - b)
+
+dispatch(main, version=("version", nimbaseVersion))
diff --git a/true.nim b/true.nim
index 4d6b8e4..f498b98 100644
--- a/true.nim
+++ b/true.nim
@@ -1,6 +1,7 @@
 import cligen
+import common
 
 proc main() = 
     system.quit(0)
 
-dispatch(main)
+dispatch(main, version=("version", nimbaseVersion))