diff --git a/.gitignore b/.gitignore
index 2e748ae..cc21fd8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,7 @@ ffind/ffind
 grepp/grepp
 joinlines/joinlines
 password-cache/cmd/password-cache/password-cache
+reverseproxy/reverseproxy
 webserve/webserve
 yaml-parse/yaml-parse
-reverseproxy/reverseproxy
+yaml-seam/yaml-seam
diff --git a/yaml-seam/go.mod b/yaml-seam/go.mod
new file mode 100644
index 0000000..83254ee
--- /dev/null
+++ b/yaml-seam/go.mod
@@ -0,0 +1,10 @@
+module github.com/DavidGamba/dgtools/yaml-seam
+
+go 1.19
+
+require (
+	github.com/DavidGamba/dgtools/trees v0.1.0 // indirect
+	github.com/DavidGamba/dgtools/yamlutils v0.0.0-20230124052542-bdc68694a034 // indirect
+	github.com/DavidGamba/go-getoptions v0.26.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
diff --git a/yaml-seam/go.sum b/yaml-seam/go.sum
new file mode 100644
index 0000000..07c92c0
--- /dev/null
+++ b/yaml-seam/go.sum
@@ -0,0 +1,9 @@
+github.com/DavidGamba/dgtools/trees v0.1.0 h1:8FllYXayVpLNomlhGUFEl0gfUxymOrqTkNyYh7QARHE=
+github.com/DavidGamba/dgtools/trees v0.1.0/go.mod h1:H9UAZh3Frqm446RrXST+rQXl4diaTMX7TLwP4f98zK0=
+github.com/DavidGamba/dgtools/yamlutils v0.0.0-20230124052542-bdc68694a034 h1:9hpuPH/f0yqt/1VzH7dCUN1pKvnK6HbnXTs2uRXAd+k=
+github.com/DavidGamba/dgtools/yamlutils v0.0.0-20230124052542-bdc68694a034/go.mod h1:lsTVYmXRS1b7lsExi1SbsTwFTraqlrezQq+N/NaQpUQ=
+github.com/DavidGamba/go-getoptions v0.26.0 h1:3Hy0o6xTYs9icM5uPNqqck5PyZm5lZWRIDH/n5SV2uw=
+github.com/DavidGamba/go-getoptions v0.26.0/go.mod h1:qLaLSYeQ8sUVOfKuu5JT5qKKS3OCwyhkYSJnoG+ggmo=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
diff --git a/yaml-seam/main.go b/yaml-seam/main.go
new file mode 100644
index 0000000..a6ce78f
--- /dev/null
+++ b/yaml-seam/main.go
@@ -0,0 +1,269 @@
+// This file is part of dgtools.
+//
+// # Copyright (C) 2019-2023  David Gamba Rios
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/DavidGamba/dgtools/yamlutils"
+	"github.com/DavidGamba/go-getoptions"
+)
+
+// BuildMetadata - Provides the metadata part of the version information.
+var BuildMetadata = "dev"
+
+const semVersion = "0.1.0"
+
+var Logger = log.New(os.Stderr, "", log.LstdFlags)
+
+func main() {
+	os.Exit(program(os.Args))
+}
+
+func program(args []string) int {
+	opt := getoptions.New()
+	opt.Self("", `Parses YAML input passed from file(s) or piped to STDIN and allows to split it or combine it.
+
+        Source: https://github.com/DavidGamba/dgtools`)
+	opt.Bool("quiet", false, opt.GetEnv("QUIET"))
+	opt.Bool("version", false, opt.Alias("V"))
+	opt.Bool("silent", false, opt.Description("Don't print full context errors."))
+
+	read := opt.NewCommand("read", "read a multi document yaml file")
+	read.HelpSynopsisArgs("<file>...")
+	read.Bool("-", false, opt.Description("Read from STDIN"))
+	read.StringSlice("key", 1, 99, opt.Alias("k"), opt.ArgName("key/index"),
+		opt.Description(`Key or index to descend to.
+Multiple keys allow to descend further.
+Indexes are positive integers.`))
+	read.SetCommandFn(ReadRun)
+
+	split := opt.NewCommand("split", "split a multi document YAML file")
+	split.HelpSynopsisArgs("<file>...")
+	split.Bool("-", false, opt.Description("Read from STDIN"))
+	split.Bool("force", false, opt.Description("Apply split"))
+	split.String("dir", "", opt.Description("Output directory to write files to. Defaults to same as source."))
+	split.String("output-prefix", "", opt.Alias("prefix"), opt.Description("Output Filename prefix"))
+	split.SetCommandFn(SplitRun)
+
+	join := opt.NewCommand("join", "join multiple YAML files into a single multi document one")
+	join.HelpSynopsisArgs("<file>...")
+	join.String("output", "", opt.Required(), opt.Description("Output file"))
+	join.SetCommandFn(JoinRun)
+
+	opt.HelpCommand("help", opt.Alias("?"))
+	remaining, err := opt.Parse(args[1:])
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "ERROR: %s\n", err)
+		return 1
+	}
+	if opt.Called("version") {
+		fmt.Printf("Version: %s+%s\n", semVersion, BuildMetadata)
+		return 0
+	}
+	if opt.Called("quiet") {
+		Logger.SetOutput(io.Discard)
+	}
+	Logger.Println(remaining)
+
+	ctx, cancel, done := getoptions.InterruptContext()
+	defer func() { cancel(); <-done }()
+
+	err = opt.Dispatch(ctx, remaining)
+	if err != nil {
+		if errors.Is(err, getoptions.ErrorHelpCalled) {
+			return 1
+		}
+		fmt.Fprintf(os.Stderr, "ERROR: %s\n", err)
+		return 1
+	}
+	return 0
+}
+
+func readInput(ctx context.Context, useStdIn bool, file string) ([]*yamlutils.YML, error) {
+	// Check if stdin is pipe p or device D
+	statStdin, _ := os.Stdin.Stat()
+	stdinIsDevice := (statStdin.Mode() & os.ModeDevice) != 0
+
+	var err error
+	var ymlList []*yamlutils.YML
+	if !stdinIsDevice && useStdIn {
+		Logger.Printf("Reading from STDIN\n")
+		reader := os.Stdin
+		ymlList, err = yamlutils.NewFromReader(reader)
+		if err != nil {
+			return ymlList, fmt.Errorf("reading yaml from STDIN: %w", err)
+		}
+	} else {
+		Logger.Printf("Reading from file: %s\n", file)
+		ymlList, err = yamlutils.NewFromFile(file)
+		if err != nil {
+			return ymlList, fmt.Errorf("reading yaml file: %w", err)
+		}
+	}
+	return ymlList, nil
+}
+
+func ReadRun(ctx context.Context, opt *getoptions.GetOpt, args []string) error {
+	keys := opt.Value("key").([]string)
+	useStdIn := opt.Value("-").(bool)
+
+	if len(args) < 1 && !useStdIn {
+		fmt.Fprintf(os.Stderr, "ERROR: missing <file> or STDIN input '-'\n")
+		fmt.Fprintf(os.Stderr, "%s", opt.Help(getoptions.HelpSynopsis))
+		return getoptions.ErrorHelpCalled
+	}
+
+	var xpaths [][]string
+	for _, k := range keys {
+		var xpath []string
+		k = strings.TrimLeft(k, "/")
+		xpath = append(xpath, strings.Split(k, "/")...)
+		Logger.Printf("path: '%s'\n", strings.Join(xpath, ","))
+		xpaths = append(xpaths, xpath)
+	}
+
+	errorCount := 0
+	files := args
+	if useStdIn {
+		files = append(files, "-")
+	}
+	for _, file := range files {
+		sIn := false
+		if file == "-" {
+			sIn = true
+		}
+		ymlList, err := readInput(ctx, sIn, file)
+		if err != nil {
+			return fmt.Errorf("failed to read input: %w", err)
+		}
+
+		for i, yml := range ymlList {
+			fmt.Printf("# %s %02d\n", file, i+1)
+			for _, xpath := range xpaths {
+				str, err := yml.GetString(false, xpath)
+				if err != nil {
+					errorCount++
+					fmt.Fprintf(os.Stderr, "ERROR: %s\n", err)
+					if !opt.Called("silent") {
+						fmt.Fprintf(os.Stderr, ">\t%s\n", strings.ReplaceAll(str, "\n", "\n>\t"))
+					}
+					continue
+				}
+				str = strings.TrimSpace(str)
+				fmt.Println(str)
+			}
+		}
+	}
+
+	if errorCount > 0 {
+		return fmt.Errorf("found %d errors when reading documents", errorCount)
+	}
+
+	return nil
+}
+
+func SplitRun(ctx context.Context, opt *getoptions.GetOpt, args []string) error {
+	dir := opt.Value("dir").(string)
+	force := opt.Value("force").(bool)
+	useStdIn := opt.Value("-").(bool)
+	oPrefix := opt.Value("output-prefix").(string)
+
+	if len(args) < 1 && !useStdIn {
+		fmt.Fprintf(os.Stderr, "ERROR: missing <file> or STDIN input '-'\n")
+		fmt.Fprintf(os.Stderr, "%s", opt.Help(getoptions.HelpSynopsis))
+		return getoptions.ErrorHelpCalled
+	}
+	if useStdIn && !opt.Called("output-prefix") {
+		fmt.Fprintf(os.Stderr, "ERROR: --output-prefix <string> is required when reading from STDIN '-'\n")
+		fmt.Fprintf(os.Stderr, "%s", opt.Help(getoptions.HelpSynopsis))
+		return getoptions.ErrorHelpCalled
+	}
+
+	file := "-"
+	if len(args) > 0 {
+		file = args[0]
+	}
+
+	if oPrefix == "" {
+		oPrefix = strings.TrimSuffix(file, ".yaml")
+		oPrefix = strings.TrimSuffix(oPrefix, ".yml")
+	}
+	if oPrefix == "" {
+		oPrefix = "stdin"
+	}
+	outputDir := filepath.Dir(oPrefix)
+	if dir != "" {
+		outputDir = dir
+	}
+	if force {
+		_ = os.MkdirAll(outputDir, 0755)
+	}
+
+	oPrefix = filepath.Base(oPrefix)
+
+	tformat := `%[1]s-%02[2]d.yaml`
+
+	ymlList, err := readInput(ctx, useStdIn, file)
+	if err != nil {
+		return fmt.Errorf("failed to read input: %w", err)
+	}
+
+	for i, yml := range ymlList {
+		filename := fmt.Sprintf(tformat, oPrefix, i+1)
+		filename = filepath.Join(outputDir, filename)
+		fmt.Printf("%s\n", filename)
+		if force {
+			str, err := yml.GetString(false, []string{})
+			if err != nil {
+				return fmt.Errorf("failed to read document %d: %w", i+1, err)
+			}
+			os.WriteFile(filename, []byte(str), 0640)
+		}
+	}
+
+	if !force {
+		fmt.Fprintf(os.Stderr, "WARNING: Running in Dry Run mode, use --force to apply changes\n")
+	}
+
+	return nil
+}
+
+func JoinRun(ctx context.Context, opt *getoptions.GetOpt, args []string) error {
+	output := opt.Value("output").(string)
+
+	if len(args) < 1 {
+		fmt.Fprintf(os.Stderr, "ERROR: missing <file>\n")
+		fmt.Fprintf(os.Stderr, "%s", opt.Help(getoptions.HelpSynopsis))
+		return getoptions.ErrorHelpCalled
+	}
+
+	fh, err := os.Create(output)
+	if err != nil {
+		return fmt.Errorf("failed to create file: %w", err)
+	}
+
+	for i, file := range args {
+		if i > 0 {
+			fh.WriteString("\n---\n")
+		}
+		contents, err := os.ReadFile(file)
+		if err != nil {
+			return fmt.Errorf("failed to read file '%s': %w", file, err)
+		}
+		fh.Write(contents)
+	}
+	return nil
+}