diff --git a/internal/instruction/cnf.go b/internal/instruction/cnf.go
new file mode 100644
index 0000000..51facc6
--- /dev/null
+++ b/internal/instruction/cnf.go
@@ -0,0 +1,48 @@
+package instruction
+
+import (
+	"fmt"
+	"strings"
+)
+
+type config struct {
+	// File is the path to the file
+	File string
+	// Path is the configuration field path
+	Path []string
+	// Value if the value to add or update
+	Value string
+}
+
+func (d *config) Build(_args string) error {
+
+	// 1. extract action (sub command)
+	split := strings.SplitN(_args, " ", 2)
+
+	// 2. check path
+	if len(split) < 2 {
+		return fmt.Errorf("missing configuration path")
+	}
+
+	// 3. check path separator
+	splitPath := strings.Split(split[0], "@")
+	if len(splitPath) > 2 {
+		return fmt.Errorf("invalid path (additional '@'?)")
+	}
+
+	d.File = splitPath[0]
+	if len(splitPath) > 1 { // add field path only if set
+		d.Path = strings.Split(splitPath[1], ".")
+	}
+
+	// add value
+	d.Value = split[1]
+
+	return nil
+}
+
+func (d config) Exec(ctx ExecutionContext) ([]byte, error) {
+
+	return nil, nil
+
+}
diff --git a/internal/instruction/common.go b/internal/instruction/common.go
new file mode 100644
index 0000000..66b383b
--- /dev/null
+++ b/internal/instruction/common.go
@@ -0,0 +1,21 @@
+package instruction
+
+import (
+	"git.xdrm.io/xdrm-brackets/nix-amer/internal/cnf"
+	"git.xdrm.io/xdrm-brackets/nix-amer/internal/pkg"
+	"git.xdrm.io/xdrm-brackets/nix-amer/internal/ser"
+)
+
+// T is the instruction common interface
+type T interface {
+	// Build the instruction with input arguments
+	Build(string) error
+	// Exec the given instruction
+	Exec(ExecutionContext) ([]byte, error)
+}
+
+type ExecutionContext struct {
+	PackageManager pkg.PackageManager
+	Configuration  cnf.ConfigurationFormat
+	ServiceManager ser.ServiceManager
+}
diff --git a/internal/instruction/del.go b/internal/instruction/del.go
new file mode 100644
index 0000000..ad7f1d7
--- /dev/null
+++ b/internal/instruction/del.go
@@ -0,0 +1,31 @@
+package instruction
+
+import (
+	"fmt"
+	"strings"
+)
+
+type delete struct {
+	Packages []string
+}
+
+func (d *delete) Build(_args string) error {
+	d.Packages = strings.Split(_args, " ")
+	return nil
+}
+
+func (d delete) Exec(ctx ExecutionContext) ([]byte, error) {
+
+	// delete all packages
+	for _, pkg := range d.Packages {
+
+		err := ctx.PackageManager.Remove(pkg)
+		if err != nil {
+			return nil, fmt.Errorf("cannot delete '%s' | %s", pkg, err)
+		}
+
+	}
+
+	return nil, nil
+
+}
diff --git a/internal/instruction/errors.go b/internal/instruction/errors.go
new file mode 100644
index 0000000..64eaf45
--- /dev/null
+++ b/internal/instruction/errors.go
@@ -0,0 +1,8 @@
+package instruction
+
+import (
+	"errors"
+)
+
+var ErrInvalidSyntax = errors.New("invalid instruction format")
+var ErrUnknownInstruction = errors.New("unknown instruction")
diff --git a/internal/instruction/ins.go b/internal/instruction/ins.go
new file mode 100644
index 0000000..87919bb
--- /dev/null
+++ b/internal/instruction/ins.go
@@ -0,0 +1,31 @@
+package instruction
+
+import (
+	"fmt"
+	"strings"
+)
+
+type install struct {
+	Packages []string
+}
+
+func (d *install) Build(_args string) error {
+	d.Packages = strings.Split(_args, " ")
+	return nil
+}
+
+func (d install) Exec(ctx ExecutionContext) ([]byte, error) {
+
+	// install all packages
+	for _, pkg := range d.Packages {
+
+		err := ctx.PackageManager.Install(pkg)
+		if err != nil {
+			return nil, fmt.Errorf("cannot install '%s' | %s", pkg, err)
+		}
+
+	}
+
+	return nil, nil
+
+}
diff --git a/internal/instruction/reader.go b/internal/instruction/reader.go
new file mode 100644
index 0000000..b3fc4ee
--- /dev/null
+++ b/internal/instruction/reader.go
@@ -0,0 +1,49 @@
+package instruction
+
+import (
+	"strings"
+)
+
+// Parse from a raw line
+func Parse(raw string) (T, error) {
+
+	// 1. format (trim + split first space)
+	raw = strings.Trim(raw, " \t\n")
+	cmd := strings.SplitN(raw, " ", 2)
+	cmd[0] = strings.Trim(cmd[0], " \t")
+	cmd[1] = strings.Trim(cmd[1], " \t")
+
+	// 2. fail if invalid base syntax 'cmd args...'
+	// where command is 3 letters
+	if len(cmd) < 2 || len(cmd[0]) < 3 || cmd[0][1] == ' ' {
+		return nil, ErrInvalidSyntax
+	}
+
+	// 3. Extract instruction type
+	switch cmd[0] {
+	case "ins":
+		i := &install{}
+		err := i.Build(cmd[1])
+		return i, err
+	case "del":
+		i := &delete{}
+		err := i.Build(cmd[1])
+		return i, err
+	case "upd":
+		i := &update{}
+		err := i.Build(cmd[1])
+		return i, err
+	case "ser":
+		i := &service{}
+		err := i.Build(cmd[1])
+		return i, err
+	case "cnf":
+		i := &config{}
+		err := i.Build(cmd[1])
+		return i, err
+	default:
+		return nil, ErrUnknownInstruction
+	}
+
+	// return nil, nil
+}
diff --git a/internal/instruction/ser.go b/internal/instruction/ser.go
new file mode 100644
index 0000000..6a1bb67
--- /dev/null
+++ b/internal/instruction/ser.go
@@ -0,0 +1,58 @@
+package instruction
+
+import (
+	"fmt"
+	"strings"
+)
+
+var actions = []string{"enable", "disable", "start", "stop", "reload", "restart"}
+
+type service struct {
+	Action   string
+	Services []string
+}
+
+func (d *service) Build(_args string) error {
+
+	// 1. extract action (sub command)
+	split := strings.Split(_args, " ")
+
+	// 2. check action
+	if len(split) < 2 {
+		return fmt.Errorf("invalid syntax, missing action or unit")
+	}
+
+	// 3. fail if unknown action
+	known := false
+	for _, act := range actions {
+		if split[0] == act {
+			known = true
+			break
+		}
+	}
+	if !known {
+		return fmt.Errorf("unknown action '%s'", split[0])
+	}
+
+	d.Action = split[0]
+
+	// 4. Store services
+	d.Services = split[1:]
+
+	return nil
+}
+
+func (d service) Exec(ctx ExecutionContext) ([]byte, error) {
+
+	// delete all packages
+	for _, service := range d.Services {
+
+		if err := ctx.ServiceManager.Exec(d.Action, service); err != nil {
+			return nil, fmt.Errorf("cannot %s '%s' | %s", d.Action, service, err)
+		}
+
+	}
+
+	return nil, nil
+
+}
diff --git a/internal/instruction/upd.go b/internal/instruction/upd.go
new file mode 100644
index 0000000..006aa2a
--- /dev/null
+++ b/internal/instruction/upd.go
@@ -0,0 +1,28 @@
+package instruction
+
+import (
+	"fmt"
+)
+
+type update struct{}
+
+func (d *update) Build(_args string) error {
+	return nil
+}
+
+func (d update) Exec(ctx ExecutionContext) ([]byte, error) {
+
+	// fetch packages
+	err := ctx.PackageManager.Fetch()
+	if err != nil {
+		return nil, fmt.Errorf("cannot fetch packages | %s", err)
+	}
+
+	// update packages
+	err = ctx.PackageManager.Upgrade()
+	if err != nil {
+		return nil, fmt.Errorf("cannot upgrade | %s", err)
+	}
+
+	return nil, nil
+}