diff --git a/beeb_fstest_test.go b/beeb_fstest_test.go
index 95a27dd..2bd0b7c 100644
--- a/beeb_fstest_test.go
+++ b/beeb_fstest_test.go
@@ -20,5 +20,5 @@ func Test_beeb_ftest(t *testing.T) {
 	}
 
 	os.Remove("+.0")
-	os.Remove("+.0.inf")
+	os.Remove("+.0" + metadataExtension)
 }
diff --git a/console.go b/console.go
index bd9c218..08fc1c3 100644
--- a/console.go
+++ b/console.go
@@ -9,7 +9,8 @@ import (
 type console interface {
 	readline() (string, bool)
 	readChar() (uint8, bool)
-	write(s string)
+	write(string)
+	writef(string, ...interface{})
 	close()
 }
 
@@ -51,4 +52,9 @@ func (c *consoleSimple) write(s string) {
 	c.env.writeSpool(s)
 }
 
+func (c *consoleSimple) writef(format string, a ...interface{}) {
+	s := fmt.Sprintf(format, a...)
+	c.write(s)
+}
+
 func (c *consoleSimple) close() {}
diff --git a/consoleLiner.go b/consoleLiner.go
index 1d9b701..e34d68a 100644
--- a/consoleLiner.go
+++ b/consoleLiner.go
@@ -88,3 +88,8 @@ func (c *consoleLiner) write(s string) {
 	fmt.Print(s)
 	c.env.writeSpool(s)
 }
+
+func (c *consoleLiner) writef(format string, a ...interface{}) {
+	s := fmt.Sprintf(format, a...)
+	c.write(s)
+}
diff --git a/consoleMock.go b/consoleMock.go
index 3e4686e..f606554 100644
--- a/consoleMock.go
+++ b/consoleMock.go
@@ -1,5 +1,7 @@
 package main
 
+import "fmt"
+
 type consoleMock struct {
 	linesIn []string
 	lineIn  int
@@ -40,4 +42,9 @@ func (c *consoleMock) write(s string) {
 	c.env.writeSpool(s)
 }
 
+func (c *consoleMock) writef(format string, a ...interface{}) {
+	s := fmt.Sprintf(format, a...)
+	c.write(s)
+}
+
 func (c *consoleMock) close() {}
diff --git a/constants.go b/constants.go
index 9977eab..0fa7d95 100644
--- a/constants.go
+++ b/constants.go
@@ -110,4 +110,6 @@ const (
 
 	// Maximim delay to detect a double control C to quit
 	controlCDelayToQuitMs = 500
+
+	metadataExtension = ".inf"
 )
diff --git a/environment.go b/environment.go
index 0038819..c821d61 100644
--- a/environment.go
+++ b/environment.go
@@ -105,7 +105,7 @@ func (env *environment) initLanguage(slot uint8) {
 		The MOS also automatically prints the ROM's title string (&8009) so that the user is acknowledged.
 	*/
 	language := env.mem.peekString(romTitleString, 0)
-	env.con.write(fmt.Sprintf("%s\n\n", language))
+	env.con.writef("%s\n\n", language)
 
 	_, x, y, p := env.cpu.GetAXYP()
 	env.cpu.SetAXYP(1, x, y, p)
diff --git a/osCLI.go b/osCLI.go
index 3bfa042..ea9186c 100644
--- a/osCLI.go
+++ b/osCLI.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"path"
 	"strconv"
 	"strings"
 )
@@ -24,6 +25,7 @@ var cliCommands = []string{
 	"DELETE",
 	"DRIVE",
 	"EXEC",
+	"EX",
 	"HELP",
 	"HOST", // Added for bbz
 	"INFO",
@@ -117,7 +119,61 @@ func execOSCLI(env *environment) {
 		}
 
 	case "CAT":
-		env.con.write("<cat placeholder>\n")
+		pathName := ""
+		_, pathName, valid = parseFilename(line, pos)
+		if !valid {
+			env.raiseError(254, "Bad Command")
+			break
+		}
+		if pathName == "" || pathName == "$" {
+			pathName = "."
+		}
+
+		entries, err := os.ReadDir(pathName)
+		if err != nil {
+			env.raiseError(errorTodo, err.Error())
+			break
+		}
+
+		for _, entry := range entries {
+			if strings.HasPrefix(entry.Name(), ".") ||
+				strings.HasSuffix(entry.Name(), metadataExtension) {
+				// Ignore the file
+			} else if entry.Type().IsRegular() {
+				env.con.writef("%v\n", entry.Name())
+			} else {
+				// Ignore the file
+			}
+		}
+
+	case "EX":
+		pathName := ""
+		_, pathName, valid = parseFilename(line, pos)
+		if !valid {
+			env.raiseError(254, "Bad Command")
+			break
+		}
+		if pathName == "" || pathName == "$" {
+			pathName = "."
+		}
+
+		entries, err := os.ReadDir(pathName)
+		if err != nil {
+			env.raiseError(errorTodo, err.Error())
+			break
+		}
+
+		for _, entry := range entries {
+			if entry.Type().IsRegular() {
+				fullName := path.Join(pathName, entry.Name())
+				attr := getFileAttributes(env, fullName)
+				env.con.writef("%-22v %06x %06x %06x \n",
+					entry.Name(),
+					attr.loadAddress&0xff_ffff,
+					attr.executionAddress&0xff_ffff,
+					attr.fileSize&0xff_ffff)
+			}
+		}
 
 	case "CODE":
 		execOSCLIfx(env, 0x88, line, pos)
@@ -206,10 +262,10 @@ func execOSCLI(env *environment) {
 
 		attr := getFileAttributes(env, filename)
 		if attr.hasMetadata {
-			env.con.write(fmt.Sprintf("%s\t %06X %06X %06X\n", filename,
-				attr.loadAddress, attr.executionAddress, attr.fileSize))
+			env.con.writef("%s\t %06X %06X %06X\n", filename,
+				attr.loadAddress, attr.executionAddress, attr.fileSize)
 		} else {
-			env.con.write(fmt.Sprintf("%s\t ?????? ?????? %06X\n", filename, attr.fileSize))
+			env.con.writef("%s\t ?????? ?????? %06X\n", filename, attr.fileSize)
 		}
 
 	// case "KEY":
@@ -267,7 +323,7 @@ func execOSCLI(env *environment) {
 				env.mem.Poke(sheilaRomLatch, uint8(i))
 				name := env.mem.peekString(romTitleString, 0)
 				if name == "" {
-					env.con.write(fmt.Sprintf("ROM %X ?\n", i))
+					env.con.writef("ROM %X ?\n", i)
 				} else {
 					version := env.mem.Peek(romVersion)
 					romType := env.mem.Peek(romTypeByte)
@@ -280,10 +336,10 @@ func execOSCLI(env *environment) {
 					}
 					attributes += ")"
 
-					env.con.write(fmt.Sprintf("ROM %X %s %02v %s\n", i, name, version, attributes))
+					env.con.writef("ROM %X %s %02v %s\n", i, name, version, attributes)
 				}
 			} else {
-				env.con.write(fmt.Sprintf("RAM %X 16K\n", i))
+				env.con.writef("RAM %X 16K\n", i)
 			}
 		}
 		env.mem.Poke(sheilaRomLatch, currentRom)
diff --git a/osFile.go b/osFile.go
index 61a9a04..773eb00 100644
--- a/osFile.go
+++ b/osFile.go
@@ -257,7 +257,7 @@ func deleteFile(env *environment, filename string) uint8 {
 		return osNotFound
 	}
 
-	os.Remove(filename + ".inf")
+	os.Remove(filename + metadataExtension)
 	return osFileFound
 }
 
@@ -285,33 +285,34 @@ func getFileAttributes(env *environment, filename string) *fileAttributes {
 		$.BasObj     003000 003100 005000 00 CRC32=614721E1
 	*/
 	attr.hasMetadata = false
-	data, err := os.ReadFile(filename + ".inf")
+	metadata := filename + metadataExtension
+	data, err := os.ReadFile(metadata)
 	if errors.Is(err, os.ErrNotExist) {
 		return &attr
 	}
 	parts := strings.Fields(string(data))
 	if len(parts) < 5 {
-		env.log(fmt.Sprintf("Invalid format for metadata file %s.inf, missing fields", filename))
+		env.log(fmt.Sprintf("Invalid format for metadata file for %s, missing fields", metadata))
 		return &attr
 	}
 
 	i, err := strconv.ParseUint(parts[1], 16, 64)
 	if err != nil {
-		env.log(fmt.Sprintf("Invalid format for metadata file %s.inf, bad load address '%s'", filename, err.Error()))
+		env.log(fmt.Sprintf("Invalid format for metadata file %s, bad load address '%s'", metadata, err.Error()))
 		return &attr
 	}
 	attr.loadAddress = uint32(i)
 
 	i, err = strconv.ParseUint(parts[2], 16, 64)
 	if err != nil {
-		env.log(fmt.Sprintf("Invalid format for metadata file %s.inf, bad exec address '%s'", filename, err.Error()))
+		env.log(fmt.Sprintf("Invalid format for metadata file %s, bad exec address '%s'", metadata, err.Error()))
 		return &attr
 	}
 	attr.executionAddress = uint32(i)
 
 	i, err = strconv.ParseUint(parts[4], 16, 64)
 	if err != nil {
-		env.log(fmt.Sprintf("Invalid format for metadata file %s.inf, bad sttributes '%s'", filename, err.Error()))
+		env.log(fmt.Sprintf("Invalid format for metadata file %s, bad sttributes '%s'", metadata, err.Error()))
 		return &attr
 	}
 	attr.attributes = uint32(i)
@@ -324,5 +325,5 @@ func writeMetada(env *environment, filename string, attr *fileAttributes) {
 	// $.BasObj     003000 003100 005000 00 CRC32=614721E1
 	metadata := fmt.Sprintf("$.FILE    %08X %08X %08X %02X",
 		attr.loadAddress, attr.executionAddress, attr.fileSize, attr.attributes)
-	os.WriteFile(filename+".inf", []byte(metadata), 0644)
+	os.WriteFile(filename+metadataExtension, []byte(metadata), 0644)
 }