diff --git a/Cargo.lock b/Cargo.lock
index 3cf733e..83a0170 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -54,9 +54,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.41"
+version = "4.5.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be92d32e80243a54711e5d7ce823c35c41c9d929dc4ab58e1276f625841aadf9"
+checksum = "1fc0e74a703892159f5ae7d3aac52c8e6c392f5ae5f359c70b5881d60aaac318"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -64,9 +64,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.41"
+version = "4.5.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "707eab41e9622f9139419d573eca0900137718000c517d47da73045f54331c3d"
+checksum = "b3e7f4214277f3c7aa526a59dd3fbe306a370daee1f8b7b8c987069cd8e888a8"
 dependencies = [
  "anstream",
  "anstyle",
@@ -76,9 +76,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.5.41"
+version = "4.5.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef4f52386a59ca4c860f7393bcf8abd8dfd91ecccc0f774635ff68e92eeef491"
+checksum = "14cb31bb0a7d536caef2639baa7fad459e15c3144efefa6dbd1c84562c4739f6"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -98,6 +98,12 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"
 
+[[package]]
+name = "either"
+version = "1.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
+
 [[package]]
 name = "equivalent"
 version = "1.0.2"
@@ -132,6 +138,15 @@ version = "1.70.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7943c866cc5cd64cbc25b2e01621d07fa8eb2a1a23160ee81ce38704e97b8ecf"
 
+[[package]]
+name = "itertools"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b192c782037fadd9cfa75548310488aabdbf3d2da73885b31bd0abd03351285"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "once_cell_polyfill"
 version = "1.70.1"
@@ -143,6 +158,7 @@ name = "podman-openrc"
 version = "0.1.2"
 dependencies = [
  "clap",
+ "itertools",
  "serde",
  "toml",
 ]
@@ -213,9 +229,9 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed0aee96c12fa71097902e0bb061a5e1ebd766a6636bb605ba401c45c1650eac"
+checksum = "75129e1dc5000bfbaa9fee9d1b21f974f9fbad9daec557a521ee6e080825f6e8"
 dependencies = [
  "indexmap",
  "serde",
@@ -237,9 +253,9 @@ dependencies = [
 
 [[package]]
 name = "toml_parser"
-version = "1.0.1"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97200572db069e74c512a14117b296ba0a80a30123fbbb5aa1f4a348f639ca30"
+checksum = "b551886f449aa90d4fe2bdaa9f4a2577ad2dde302c61ecf262d80b116db95c10"
 dependencies = [
  "winnow",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 01f041c..cb14194 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,6 +12,7 @@ repository = "https://git.plabble.org/Maurice/podman-openrc"
 readme = "README.md"
 
 [dependencies]
-clap = { version = "4.5.41", features = ["derive"] }
+clap = { version = "4.5.45", features = ["derive"] }
+itertools = "0.14.0"
 serde = { version = "1.0", features = ["derive"] }
-toml = "0.9.2"
+toml = "0.9.5"
diff --git a/README.md b/README.md
index 6dfbe6a..d1a2f17 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,6 @@ capabilities = ["NET_BIND_SERVICE"] # Optional property, add Linux capabilities
 [service]
 name = "<CONTAINER NAME>" # Container name, required
 image = "<IMAGE>" # Podman image name
-networks = ["<NETWORK>"] # Optional, if you want to run the container within a specific network. Set to "host" if you don't want to use the podman networking.
 depend = ["<SERVICE NAME>"] # Name of any service in /etc/init.d to depend on
 restart = "unless-stopped" # Restart, optional. Defaults to "unless-stopped"
 detach = true # Run container in detach mode, optional, default true. Recommended.
@@ -35,6 +34,19 @@ command = "<COMMAND>" # Container command to run, optional.
 [environment]
 ASPNETCORE_ENVIRONMENT = "Test"
 # If you have a not TOML-compatible key name, use "" around the key name
+
+# Optional, if you want to run the container within specific network(s). Set to "host" if you don't want to use the podman networking.
+[[networks]]
+name = "host"
+
+# You can also create groups
+[[networks]]
+name = "netw-service-test"
+group = "http-networks"
+
+# And assign ALL networks assigned to a group to a service
+[[networks]]
+group = "http-networks"
  
 # Optionally, you can assign one or more port mappings
 [[ports]]
diff --git a/src/main.rs b/src/main.rs
index c49cfeb..7a634c2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,12 +1,20 @@
-use std::fs;
+use std::{collections::HashMap, fs, path::Path};
 
 use clap::Parser;
+use itertools::Itertools;
 
-use crate::service::ServiceConfig;
+use crate::service::{NetworkMapping, ServiceConfig};
 
 mod service;
 
 pub fn generate_openrc(config: &ServiceConfig) -> String {
+    let networks: Vec<String> = config.networks.clone()
+        .into_iter()
+        .filter(|n|n.name.is_some())
+        .map(|n|n.name.unwrap())
+        .dedup()
+        .collect();
+
     let mut script = String::from("#!/sbin/openrc-run\n# !!! AUTO GENERATED - DO NOT EDIT !!!\n\n");
     let wrap = |cmd: &str| {
         if let Some(user) = config.user.as_ref() {
@@ -27,11 +35,11 @@ pub fn generate_openrc(config: &ServiceConfig) -> String {
     // start_pre()
     script.push_str("start_pre() {\n");
     let mut start_pre_commands = Vec::new();
-    for network in &config.service.networks {
+    for network in networks.iter() {
         start_pre_commands.push(format!("podman network create {} --ignore;", network));
     }
     start_pre_commands.push(format!("podman rm {} --ignore;", config.service.name));
-    script.push_str(&wrap(&start_pre_commands.join("\n")));
+    script.push_str(&start_pre_commands.iter().map(|c|wrap(c)).collect::<Vec<String>>().join("\n"));
     script.push_str("\n}\n\n");
     // }
 
@@ -39,8 +47,15 @@ pub fn generate_openrc(config: &ServiceConfig) -> String {
     script.push_str("start() {\n");
 
     let mut arguments = vec![
-        format!("--restart {}", config.service.restart.as_deref().unwrap_or("unless-stopped")),
-        format!("--name {}", config.service.name)
+        format!(
+            "--restart {}",
+            config
+                .service
+                .restart
+                .as_deref()
+                .unwrap_or("unless-stopped")
+        ),
+        format!("--name {}", config.service.name),
     ];
 
     if let Some(hostname) = &config.service.hostname {
@@ -51,7 +66,7 @@ pub fn generate_openrc(config: &ServiceConfig) -> String {
         arguments.push("--detach".to_string());
     }
 
-    for network in &config.service.networks {
+    for network in networks.iter() {
         arguments.push(format!("--network {}", network));
     }
 
@@ -72,7 +87,10 @@ pub fn generate_openrc(config: &ServiceConfig) -> String {
     }
 
     for secret in &config.environment_secrets {
-        arguments.push(format!("--env {}=$(podman secret inspect --showsecret --format {{{{.SecretData}}}} {})", secret.name, secret.secret));
+        arguments.push(format!(
+            "--env {}=$(podman secret inspect --showsecret --format {{{{.SecretData}}}} {})",
+            secret.name, secret.secret
+        ));
     }
 
     for volume in &config.volumes {
@@ -80,13 +98,16 @@ pub fn generate_openrc(config: &ServiceConfig) -> String {
     }
 
     for mount in &config.mounts {
-        let mut mount_str = format!("--mount type={},source={},target={}", mount.typ, mount.source, mount.target);
+        let mut mount_str = format!(
+            "--mount type={},source={},target={}",
+            mount.typ, mount.source, mount.target
+        );
         if mount.read_only.unwrap_or(false) {
             mount_str.push_str(",readonly");
         }
         arguments.push(mount_str);
     }
-    
+
     if let Some(healthcheck) = &config.service.healthcheck {
         arguments.push(format!("--health-cmd '{}'", healthcheck.cmd));
         if let Some(interval) = &healthcheck.interval {
@@ -109,18 +130,29 @@ pub fn generate_openrc(config: &ServiceConfig) -> String {
         arguments.push(command.clone());
     }
 
-    script.push_str(&wrap(&format!("podman run {}", arguments.iter()
-        .enumerate()
-        .map(|(i, arg)| if i > 0 { format!("\t{}", arg) } else { arg.to_string() })
-        .collect::<Vec<_>>()
-        .join(" \\\n"))));
+    script.push_str(&wrap(&format!(
+        "podman run {}",
+        arguments
+            .iter()
+            .enumerate()
+            .map(|(i, arg)| if i > 0 {
+                format!("\t{}", arg)
+            } else {
+                arg.to_string()
+            })
+            .collect::<Vec<_>>()
+            .join(" \\\n")
+    )));
 
     script.push_str("\n}\n\n");
     // }
 
     // stop()
     script.push_str("stop() {\n");
-    script.push_str(&wrap(&format!("podman stop {} --ignore", config.service.name)));
+    script.push_str(&wrap(&format!(
+        "podman stop {} --ignore",
+        config.service.name
+    )));
     script.push_str("\n}\n\n");
     // }
 
@@ -130,21 +162,127 @@ pub fn generate_openrc(config: &ServiceConfig) -> String {
 /// Program to generate OpenRC scripts from Podman service definitions in TOML format.
 #[derive(Debug, Parser)]
 struct Args {
-    /// Definition file in TOML format
+    /// Definition file in TOML format, or directory with definition files
     definition: String,
 
-    /// Output file for the OpenRC script
+    /// Output file for the OpenRC script, or output directory for the service files
     out: String,
 }
 
+fn read_dir<P: AsRef<Path>>(path: &P, services: &mut Vec<ServiceConfig>) {
+    for entry in fs::read_dir(path).expect(&format!(
+        "Failed to read directory: {}",
+        path.as_ref().display()
+    )) {
+        let path = entry.unwrap().path();
+
+        if path.is_dir() {
+            read_dir(&path, services);
+        } else if path.is_file()
+            && path.extension().is_some_and(|ext| ext == "toml")
+            && path
+                .file_name()
+                .unwrap()
+                .to_str()
+                .unwrap()
+                .ends_with("service.toml")
+        {
+            println!("Processing: {}", path.display());
+            let input = fs::read_to_string(&path).expect(&format!(
+                "Failed to read definition file: {}",
+                path.display()
+            ));
+
+            let config: ServiceConfig = toml::from_str(&input).expect(&format!(
+                "Failed to parse definition file: {}",
+                path.display()
+            ));
+
+            services.push(config);
+        } else {
+            println!("Skipped: {}", path.display());
+        }
+    }
+}
+
+fn process_network_groups(services: &mut Vec<ServiceConfig>) {
+    // Map network groups
+    let mut network_groups: HashMap<String, Vec<String>> = HashMap::new();
+    for service in services.iter() {
+        for network in &service.networks {
+            if let NetworkMapping {
+                name: Some(name),
+                group: Some(group),
+            } = network
+            {
+                if network_groups.contains_key(group) {
+                    network_groups.get_mut(group).unwrap().push(name.clone());
+                } else {
+                    network_groups.insert(group.clone(), vec![name.clone()]);
+                }
+            }
+        }
+    }
+
+    // Expand network groups in services
+    for service in services {
+        let mut networks_to_add = Vec::new();
+        service.networks.retain(|network| {
+            if let NetworkMapping {
+                name: None,
+                group: Some(group),
+            } = network
+            {
+                if let Some(names) = network_groups.get(group) {
+                    for name in names {
+                        networks_to_add.push(NetworkMapping {
+                            name: Some(name.clone()),
+                            group: Some(group.clone()),
+                        });
+                    }
+                }
+                false // Remove this network mapping
+            } else {
+                true // Keep this network mapping
+            }
+        });
+        service.networks.extend(networks_to_add);
+    }
+}
+
 fn main() {
     let args = Args::parse();
-    let input = fs::read_to_string(&args.definition)
-        .expect("Failed to read definition file");
-    let config: ServiceConfig = toml::from_str(&input)
-        .expect("Failed to parse definition file");
+    let input_path = Path::new(&args.definition);
+    let output_path = Path::new(&args.out);
 
-    let output =  generate_openrc(&config);
-    fs::write(&args.out, output)
-        .expect("Failed to write OpenRC script to output file");
+    if input_path.is_dir() {
+        if !output_path.exists() {
+            fs::create_dir_all(&output_path).expect("Failed to create output directory");
+        }
+
+        if !output_path.is_dir() {
+            panic!(
+                "Input path is a directory, but output path is not a directory: {}",
+                output_path.display()
+            );
+        }
+
+        let mut services: Vec<ServiceConfig> = Vec::new();
+        read_dir(&input_path, &mut services);
+        process_network_groups(&mut services);
+
+        // Write
+        for config in services {
+            let output = generate_openrc(&config);
+            fs::write(output_path.join(format!("{}.service.sh", config.service.name)), output)
+                .expect("Failed to write OpenRC script to output file");
+        }
+    } else {
+        let input = fs::read_to_string(&args.definition).expect("Failed to read definition file");
+        let config: ServiceConfig =
+            toml::from_str(&input).expect("Failed to parse definition file");
+
+        let output = generate_openrc(&config);
+        fs::write(&args.out, output).expect("Failed to write OpenRC script to output file");
+    }
 }
diff --git a/src/service.rs b/src/service.rs
index 7240eef..c064de0 100644
--- a/src/service.rs
+++ b/src/service.rs
@@ -24,6 +24,9 @@ pub struct ServiceConfig {
     #[serde(default)]
     pub mounts: Vec<MountMapping>,
 
+    #[serde(default)]
+    pub networks: Vec<NetworkMapping>,
+
     pub user: Option<String>,
 
     #[serde(default)]
@@ -36,9 +39,6 @@ pub struct Service {
     pub hostname: Option<String>,
     pub image: String,
 
-    #[serde(default)]
-    pub networks: Vec<String>,
-
     pub restart: Option<String>,
     pub detach: Option<bool>,
     pub healthcheck: Option<HealthCheck>,
@@ -89,4 +89,10 @@ pub struct HealthCheck {
     pub start_period: Option<String>,
     pub retries: Option<u32>,
     pub on_failure: Option<String>,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct NetworkMapping {
+    pub name: Option<String>,
+    pub group: Option<String>,
 }
\ No newline at end of file