diff --git a/packages/ctl/ctl.js b/packages/ctl/ctl.js
index 7c41f0fc..3966abb8 100755
--- a/packages/ctl/ctl.js
+++ b/packages/ctl/ctl.js
@@ -595,7 +595,7 @@ async function startControl() {
 			type: "string",
 		})
 		.command("plugin", "Manage available plugins", libSharedCommands.pluginCommand)
-		.command("control-config", "Manage Control config", libConfig.configCommand)
+		.command("control-config", "Manage Control config", libSharedCommands.configCommand)
 		.wrap(yargs.terminalWidth())
 		.help(false) // Disable help to avoid triggering it on the first parse.
 	;
@@ -681,7 +681,7 @@ async function startControl() {
 
 	// Handle the control-config command before trying to connect.
 	if (args._[0] === "control-config") {
-		await libConfig.handleConfigCommand(args, controlConfig, args.config);
+		await libSharedCommands.handleConfigCommand(args, controlConfig, args.config);
 		return;
 	}
 
diff --git a/packages/lib/config/definitions.js b/packages/lib/config/definitions.js
index 27edcbe7..c95c0fb3 100644
--- a/packages/lib/config/definitions.js
+++ b/packages/lib/config/definitions.js
@@ -1,8 +1,6 @@
 // Core definitions for the configuration system
 "use strict";
 
-const fs = require("fs-extra");
-
 const classes = require("./classes");
 
 
@@ -379,77 +377,6 @@ function finalizeConfigs() {
 	ControlConfig.finalize();
 }
 
-/**
- * Yargs config command
- *
- * Can be passed to yargs.command to implement a config command.  Use
- * handleConfigCommand to do the requested action.
- *
- * @param {Object} yargs - yargs command builder.
- * @memberof module:lib/config
- */
-function configCommand(yargs) {
-	yargs
-		.command("set <field> [value]", "Set config field")
-		.command("show <field>", "Show value of the given config field")
-		.command("list", "List all configuration fields and their values")
-		.demandCommand(1, "You need to specify a command to run")
-		.help()
-		.strict()
-	;
-}
-
-/**
- * Handle yargs command
- *
- * Handle the actions that are made available by configCommand.
- *
- * @param {Object} args - yargs args object.
- * @param {module:lib/config.Config} instance - Config instance.
- * @param {string} configPath - Path to configuration file.
- * @memberof module:lib/config
- */
-async function handleConfigCommand(args, instance, configPath) {
-	let command = args._[1];
-
-	if (command === "list") {
-		for (let GroupClass of instance.constructor.groups.values()) {
-			for (let def of GroupClass.definitions.values()) {
-				let value = instance.get(def.fullName);
-				console.log(`${def.fullName} ${JSON.stringify(value)}`);
-			}
-		}
-
-	} else if (command === "show") {
-		try {
-			console.log(instance.get(args.field));
-		} catch (err) {
-			if (err instanceof classes.InvalidField) {
-				console.error(err.message);
-			} else {
-				throw err;
-			}
-		}
-
-	} else if (command === "set") {
-		if (args.value === undefined) {
-			args.value = null;
-		}
-
-		try {
-			instance.set(args.field, args.value);
-			await fs.outputFile(configPath, JSON.stringify(instance.serialize(), null, 4));
-		} catch (err) {
-			if (err instanceof classes.InvalidField || err instanceof classes.InvalidValue) {
-				console.error(err.message);
-			} else {
-				throw err;
-			}
-		}
-	}
-}
-
-
 module.exports = {
 	MasterGroup,
 	SlaveGroup,
@@ -464,6 +391,4 @@ module.exports = {
 
 	registerPluginConfigGroups,
 	finalizeConfigs,
-	configCommand,
-	handleConfigCommand,
 };
diff --git a/packages/lib/shared_commands.js b/packages/lib/shared_commands.js
index 29550cb6..0bd370ce 100644
--- a/packages/lib/shared_commands.js
+++ b/packages/lib/shared_commands.js
@@ -6,6 +6,9 @@
 const fs = require("fs-extra");
 const path = require("path");
 
+const libConfig = require("./config");
+
+
 /**
  * Yargs plugin command
  *
@@ -80,7 +83,80 @@ async function handlePluginCommand(args, pluginList, pluginListPath) {
 	}
 }
 
+
+/**
+ * Yargs config command
+ *
+ * Can be passed to yargs.command to implement a config command.  Use
+ * handleConfigCommand to do the requested action.
+ *
+ * @param {Object} yargs - yargs command builder.
+ */
+function configCommand(yargs) {
+	yargs
+		.command("set <field> [value]", "Set config field")
+		.command("show <field>", "Show value of the given config field")
+		.command("list", "List all configuration fields and their values")
+		.demandCommand(1, "You need to specify a command to run")
+		.help()
+		.strict()
+	;
+}
+
+/**
+ * Handle yargs command
+ *
+ * Handle the actions that are made available by configCommand.
+ *
+ * @param {Object} args - yargs args object.
+ * @param {module:lib/config.Config} instance - Config instance.
+ * @param {string} configPath - Path to configuration file.
+ */
+async function handleConfigCommand(args, instance, configPath) {
+	let command = args._[1];
+
+	if (command === "list") {
+		for (let GroupClass of instance.constructor.groups.values()) {
+			for (let def of GroupClass.definitions.values()) {
+				let value = instance.get(def.fullName);
+				console.log(`${def.fullName} ${JSON.stringify(value)}`);
+			}
+		}
+
+	} else if (command === "show") {
+		try {
+			console.log(instance.get(args.field));
+		} catch (err) {
+			if (err instanceof libConfig.InvalidField) {
+				console.error(err.message);
+			} else {
+				throw err;
+			}
+		}
+
+	} else if (command === "set") {
+		if (args.value === undefined) {
+			args.value = null;
+		}
+
+		try {
+			instance.set(args.field, args.value);
+			await fs.outputFile(configPath, JSON.stringify(instance.serialize(), null, 4));
+		} catch (err) {
+			if (err instanceof libConfig.InvalidField || err instanceof libConfig.InvalidValue) {
+				console.error(err.message);
+			} else {
+				throw err;
+			}
+		}
+	}
+}
+
+
 module.exports = {
 	pluginCommand,
 	handlePluginCommand,
+
+	configCommand,
+	handleConfigCommand,
 };
diff --git a/packages/master/master.js b/packages/master/master.js
index cbdbf0ac..f880e59d 100755
--- a/packages/master/master.js
+++ b/packages/master/master.js
@@ -1574,7 +1574,7 @@ async function startServer() {
 			type: "string",
 		})
 		.command("plugin", "Manage available plugins", libSharedCommands.pluginCommand)
-		.command("config", "Manage Master config", libConfig.configCommand)
+		.command("config", "Manage Master config", libSharedCommands.configCommand)
 		.command("bootstrap", "Bootstrap access to cluster", yargs => {
 			yargs
 				.command("create-admin <name>", "Create a cluster admin")
@@ -1641,7 +1641,7 @@ async function startServer() {
 	}
 
 	if (command === "config") {
-		await libConfig.handleConfigCommand(args, masterConfig, masterConfigPath);
+		await libSharedCommands.handleConfigCommand(args, masterConfig, masterConfigPath);
 		return;
 
 	} else if (command === "bootstrap") {
diff --git a/packages/slave/slave.js b/packages/slave/slave.js
index e6746b69..37c13d7b 100755
--- a/packages/slave/slave.js
+++ b/packages/slave/slave.js
@@ -1395,7 +1395,7 @@ async function startSlave() {
 			type: "string",
 		})
 		.command("plugin", "Manage available plugins", libSharedCommands.pluginCommand)
-		.command("config", "Manage Slave config", libConfig.configCommand)
+		.command("config", "Manage Slave config", libSharedCommands.configCommand)
 		.command("run", "Run slave")
 		.demandCommand(1, "You need to specify a command to run")
 		.strict()
@@ -1440,7 +1440,7 @@ async function startSlave() {
 	}
 
 	if (command === "config") {
-		await libConfig.handleConfigCommand(args, slaveConfig, args.config);
+		await libSharedCommands.handleConfigCommand(args, slaveConfig, args.config);
 		return;
 	}