diff --git a/README.md b/README.md
index 7c89f45..55460d3 100644
--- a/README.md
+++ b/README.md
@@ -69,10 +69,41 @@ The default terminal is `Terminal` (macOS Terminal.app). The default shell is de
 | `←/→` or `h/l` | switch panel |
 | `Enter` | run selected command / all commands in the current terminal |
 | `o` | open selected command / all commands in a new terminal window |
+| `c` | open custom command mode for the current file |
 | `e` | open current `.md` file in `$EDITOR` |
 | `r` | reload data |
 | `q` / `Esc` | quit |
 
+## Custom command mode
+
+Press `c` on a selected file to run a custom command against specific lines from that file.
+
+For a file containing:
+
+```markdown
+# PVE1
+ssh root@host1.example.com
+
+# PVE2
+ssh root@host2.example.com
+
+# PVE3
+ssh root@host3.example.com
+```
+
+Press `c`, select lines with `Space`, type `lsblk`, and press `Enter`. `lines` will run:
+
+```bash
+ssh root@host2.example.com lsblk
+ssh root@host3.example.com lsblk
+```
+
+Use `{}` as a placeholder if your lines are just addresses:
+
+```bash
+ssh {} lsblk
+```
+
 ## History
 
 Every command run through `lines` is appended to `~/.lines/history.log`:
diff --git a/src/app.rs b/src/app.rs
index b4e9e68..7d8e558 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -3,6 +3,12 @@ use std::path::PathBuf;
 use crate::config::Terminal;
 use crate::parser::{load_groups, CommandFile, Group, Section};
 
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Screen {
+    Main,
+    Custom,
+}
+
 #[derive(Debug, Clone)]
 pub struct PendingCommand {
     pub group: String,
@@ -11,6 +17,62 @@ pub struct PendingCommand {
     pub commands: Vec<String>,
 }
 
+#[derive(Debug, Clone)]
+pub struct CustomState {
+    pub lines: Vec<String>,
+    pub selected: Vec<bool>,
+    pub cursor: usize,
+    pub command: String,
+}
+
+impl CustomState {
+    pub fn from_file(file: &CommandFile) -> Self {
+        let mut lines = Vec::new();
+        for section in &file.sections {
+            if section.is_run_all() {
+                continue;
+            }
+            for cmd in &section.commands {
+                lines.push(cmd.clone());
+            }
+        }
+        let selected = vec![false; lines.len()];
+        CustomState {
+            lines,
+            selected,
+            cursor: 0,
+            command: String::new(),
+        }
+    }
+
+    pub fn toggle(&mut self) {
+        if let Some(s) = self.selected.get_mut(self.cursor) {
+            *s = !*s;
+        }
+    }
+
+    pub fn next(&mut self) {
+        if !self.lines.is_empty() {
+            self.cursor = (self.cursor + 1) % self.lines.len();
+        }
+    }
+
+    pub fn previous(&mut self) {
+        if !self.lines.is_empty() {
+            self.cursor = self.cursor.checked_sub(1).unwrap_or(self.lines.len() - 1);
+        }
+    }
+
+    pub fn selected_lines(&self) -> Vec<String> {
+        self.lines
+            .iter()
+            .enumerate()
+            .filter(|(i, _)| self.selected.get(*i).copied().unwrap_or(false))
+            .map(|(_, line)| line.clone())
+            .collect()
+    }
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum Focus {
     Groups,
@@ -27,6 +89,8 @@ pub struct App {
     pub file_index: usize,
     pub section_index: usize,
     pub focus: Focus,
+    pub screen: Screen,
+    pub custom_state: Option<CustomState>,
     pub pending_command: Option<PendingCommand>,
     pub message: Option<String>,
 }
@@ -43,6 +107,8 @@ impl App {
             file_index: 0,
             section_index: 0,
             focus: Focus::Groups,
+            screen: Screen::Main,
+            custom_state: None,
             pending_command: None,
             message: None,
         }
@@ -55,6 +121,18 @@ impl App {
         self.section_index = self.section_index.min(self.current_sections().len().saturating_sub(1));
     }
 
+    pub fn enter_custom(&mut self) {
+        if let Some(file) = self.current_file() {
+            self.custom_state = Some(CustomState::from_file(file));
+            self.screen = Screen::Custom;
+        }
+    }
+
+    pub fn exit_custom(&mut self) {
+        self.screen = Screen::Main;
+        self.custom_state = None;
+    }
+
     pub fn current_group(&self) -> Option<&Group> {
         self.groups.get(self.group_index)
     }
diff --git a/src/custom.rs b/src/custom.rs
new file mode 100644
index 0000000..71fccd4
--- /dev/null
+++ b/src/custom.rs
@@ -0,0 +1,83 @@
+use crate::app::CustomState;
+
+pub fn build_commands(state: &CustomState) -> Vec<String> {
+    let command = state.command.trim();
+    if command.is_empty() {
+        return Vec::new();
+    }
+
+    let selected = state.selected_lines();
+    if selected.is_empty() {
+        return Vec::new();
+    }
+
+    selected
+        .iter()
+        .map(|line| {
+            let line = line.trim();
+            if command.contains("{}") {
+                command.replace("{}", line)
+            } else {
+                format!("{} {}", line, command)
+            }
+        })
+        .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::app::CustomState;
+
+    fn make_state(lines: Vec<String>, selected: Vec<bool>, command: &str) -> CustomState {
+        CustomState {
+            lines,
+            selected,
+            cursor: 0,
+            command: command.to_string(),
+        }
+    }
+
+    #[test]
+    fn test_build_commands_append() {
+        let state = make_state(
+            vec![
+                "ssh root@ip1".to_string(),
+                "ssh root@ip2".to_string(),
+                "ssh root@ip3".to_string(),
+            ],
+            vec![false, true, true],
+            "lsblk",
+        );
+        assert_eq!(
+            build_commands(&state),
+            vec!["ssh root@ip2 lsblk", "ssh root@ip3 lsblk"]
+        );
+    }
+
+    #[test]
+    fn test_build_commands_placeholder() {
+        let state = make_state(
+            vec![
+                "root@ip1".to_string(),
+                "root@ip2".to_string(),
+            ],
+            vec![true, true],
+            "ssh {} lsblk",
+        );
+        assert_eq!(
+            build_commands(&state),
+            vec!["ssh root@ip1 lsblk", "ssh root@ip2 lsblk"]
+        );
+    }
+
+    #[test]
+    fn test_build_commands_empty_selection() {
+        let state = make_state(
+            vec!["ssh root@ip1".to_string()],
+            vec![false],
+            "lsblk",
+        );
+        assert!(build_commands(&state).is_empty());
+    }
+}
diff --git a/src/events.rs b/src/events.rs
index 2eaef12..5649e38 100644
--- a/src/events.rs
+++ b/src/events.rs
@@ -2,8 +2,9 @@ use crossterm::event::{self, Event, KeyCode, KeyEventKind};
 use std::io;
 use std::time::Duration;
 
-use crate::app::{App, PendingCommand};
+use crate::app::{App, PendingCommand, Screen};
 use crate::commands::{edit_file, run_section};
+use crate::custom::build_commands;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum AppEvent {
@@ -29,61 +30,110 @@ pub fn handle_event(app: &mut App, event: AppEvent) -> bool {
             if key.kind != KeyEventKind::Press {
                 return true;
             }
-            match key.code {
-                KeyCode::Char('q') | KeyCode::Esc => return false,
-                KeyCode::Char('j') | KeyCode::Down => app.next(),
-                KeyCode::Char('k') | KeyCode::Up => app.previous(),
-                KeyCode::Char('h') | KeyCode::Left => app.focus_left(),
-                KeyCode::Char('l') | KeyCode::Right => app.focus_right(),
-                KeyCode::Char('r') => app.reload(),
-                KeyCode::Char('e') => {
-                    if let Some(file) = app.current_file() {
-                        edit_file(&file.path, &app.terminal, &app.shell);
-                    }
-                }
-                KeyCode::Char('o') => {
-                    if let (Some(section), Some(file), Some(group)) =
-                        (app.current_section(), app.current_file(), app.current_group())
-                    {
-                        run_section(
-                            section,
-                            file,
-                            &app.terminal,
-                            &app.shell,
-                            &app.data_dir,
-                            &group.name,
-                            &file.name,
-                            &section.title,
-                        );
-                    }
-                }
-                KeyCode::Enter => {
-                    if let (Some(section), Some(file), Some(group)) =
-                        (app.current_section(), app.current_file(), app.current_group())
-                    {
-                        let commands = if section.is_run_all() {
-                            file.sections
-                                .iter()
-                                .filter(|s| !s.is_run_all())
-                                .flat_map(|s| s.commands.clone())
-                                .collect()
-                        } else {
-                            section.commands.clone()
-                        };
-                        if !commands.is_empty() {
-                            app.pending_command = Some(PendingCommand {
-                                group: group.name.clone(),
-                                file: file.name.clone(),
-                                section: section.title.clone(),
-                                commands,
-                            });
-                            return false;
-                        }
-                    }
-                }
-                _ => {}
+
+            match app.screen {
+                Screen::Main => handle_main_event(app, key),
+                Screen::Custom => handle_custom_event(app, key),
             }
-            true
         }
     }
 }
+
+fn handle_main_event(app: &mut App, key: event::KeyEvent) -> bool {
+    match key.code {
+        KeyCode::Char('q') | KeyCode::Esc => return false,
+        KeyCode::Char('j') | KeyCode::Down => app.next(),
+        KeyCode::Char('k') | KeyCode::Up => app.previous(),
+        KeyCode::Char('h') | KeyCode::Left => app.focus_left(),
+        KeyCode::Char('l') | KeyCode::Right => app.focus_right(),
+        KeyCode::Char('r') => app.reload(),
+        KeyCode::Char('e') => {
+            if let Some(file) = app.current_file() {
+                edit_file(&file.path, &app.terminal, &app.shell);
+            }
+        }
+        KeyCode::Char('c') => {
+            app.enter_custom();
+        }
+        KeyCode::Char('o') => {
+            if let (Some(section), Some(file), Some(group)) =
+                (app.current_section(), app.current_file(), app.current_group())
+            {
+                run_section(
+                    section,
+                    file,
+                    &app.terminal,
+                    &app.shell,
+                    &app.data_dir,
+                    &group.name,
+                    &file.name,
+                    &section.title,
+                );
+            }
+        }
+        KeyCode::Enter => {
+            if let (Some(section), Some(file), Some(group)) =
+                (app.current_section(), app.current_file(), app.current_group())
+            {
+                let commands = if section.is_run_all() {
+                    file.sections
+                        .iter()
+                        .filter(|s| !s.is_run_all())
+                        .flat_map(|s| s.commands.clone())
+                        .collect()
+                } else {
+                    section.commands.clone()
+                };
+                if !commands.is_empty() {
+                    app.pending_command = Some(PendingCommand {
+                        group: group.name.clone(),
+                        file: file.name.clone(),
+                        section: section.title.clone(),
+                        commands,
+                    });
+                    return false;
+                }
+            }
+        }
+        _ => {}
+    }
+    true
+}
+
+fn handle_custom_event(app: &mut App, key: event::KeyEvent) -> bool {
+    let Some(state) = app.custom_state.as_mut() else {
+        app.exit_custom();
+        return true;
+    };
+
+    match key.code {
+        KeyCode::Esc | KeyCode::Char('q') => {
+            app.exit_custom();
+        }
+        KeyCode::Char('j') | KeyCode::Down => state.next(),
+        KeyCode::Char('k') | KeyCode::Up => state.previous(),
+        KeyCode::Char(' ') => state.toggle(),
+        KeyCode::Backspace => {
+            state.command.pop();
+        }
+        KeyCode::Enter => {
+            let commands = build_commands(state);
+            if !commands.is_empty()
+                && let (Some(file), Some(group)) = (app.current_file(), app.current_group())
+            {
+                app.pending_command = Some(PendingCommand {
+                    group: group.name.clone(),
+                    file: file.name.clone(),
+                    section: "custom".to_string(),
+                    commands,
+                });
+                return false;
+            }
+        }
+        KeyCode::Char(c) => {
+            state.command.push(c);
+        }
+        _ => {}
+    }
+    true
+}
diff --git a/src/main.rs b/src/main.rs
index 8afa8d5..b8d1dff 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 mod app;
 mod commands;
 mod config;
+mod custom;
 mod events;
 mod logger;
 mod parser;
diff --git a/src/ui.rs b/src/ui.rs
index 9b4c3d1..401339d 100644
--- a/src/ui.rs
+++ b/src/ui.rs
@@ -6,9 +6,16 @@ use ratatui::{
     Frame,
 };
 
-use crate::app::{App, Focus};
+use crate::app::{App, Focus, Screen};
 
 pub fn draw(f: &mut Frame, app: &App) {
+    match app.screen {
+        Screen::Main => draw_main(f, app),
+        Screen::Custom => draw_custom(f, app),
+    }
+}
+
+fn draw_main(f: &mut Frame, app: &App) {
     let chunks = Layout::default()
         .direction(Direction::Vertical)
         .margin(1)
@@ -35,6 +42,69 @@ pub fn draw(f: &mut Frame, app: &App) {
     draw_status(f, app, chunks[2]);
 }
 
+fn draw_custom(f: &mut Frame, app: &App) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .margin(1)
+        .constraints([
+            Constraint::Min(5),
+            Constraint::Length(3),
+            Constraint::Length(1),
+        ])
+        .split(f.area());
+
+    let Some(state) = app.custom_state.as_ref() else {
+        return;
+    };
+
+    let items: Vec<ListItem> = state
+        .lines
+        .iter()
+        .enumerate()
+        .map(|(i, line)| {
+            let checked = if state.selected.get(i).copied().unwrap_or(false) {
+                "[x]"
+            } else {
+                "[ ]"
+            };
+            let style = if i == state.cursor {
+                Style::default()
+                    .bg(Color::Blue)
+                    .fg(Color::Black)
+                    .add_modifier(Modifier::BOLD)
+            } else {
+                Style::default()
+            };
+            ListItem::new(format!("{} {}", checked, line)).style(style)
+        })
+        .collect();
+
+    let list = List::new(items).block(
+        Block::default()
+            .title(" Custom command — select lines with Space ")
+            .borders(Borders::ALL),
+    );
+    f.render_widget(list, chunks[0]);
+
+    let input = Paragraph::new(state.command.as_str())
+        .block(
+            Block::default()
+                .title(" Command (use {} for selected line) ")
+                .borders(Borders::ALL)
+                .border_style(Style::default().fg(Color::Yellow)),
+        )
+        .wrap(Wrap { trim: true });
+    f.render_widget(input, chunks[1]);
+
+    let help = "Space: toggle | j/k: move | Enter: run | Esc: back";
+    let text = match &app.message {
+        Some(msg) => Text::from(msg.as_str()),
+        None => Text::from(help),
+    };
+    let paragraph = Paragraph::new(text).style(Style::default().fg(Color::Gray));
+    f.render_widget(paragraph, chunks[2]);
+}
+
 fn draw_groups(f: &mut Frame, app: &App, area: ratatui::layout::Rect) {
     let items: Vec<ListItem> = app
         .groups
@@ -173,7 +243,7 @@ fn draw_preview(f: &mut Frame, app: &App, area: ratatui::layout::Rect) {
 }
 
 fn draw_status(f: &mut Frame, app: &App, area: ratatui::layout::Rect) {
-    let help = "↑/↓ or j/k: move | →/← or h/l: panel | Enter: run | o: open in new window | e: edit | r: reload | q: quit";
+    let help = "↑/↓ or j/k: move | →/← or h/l: panel | Enter: run | o: new window | c: custom | e: edit | r: reload | q: quit";
     let text = match &app.message {
         Some(msg) => Text::from(msg.as_str()),
         None => Text::from(help),