diff --git a/src/file_browser.rs b/src/file_browser.rs
index 91194f2..558e5a6 100644
--- a/src/file_browser.rs
+++ b/src/file_browser.rs
@@ -273,6 +273,25 @@ impl FileBrowser {
         Ok(())
     }
 
+    pub fn open_bg(&mut self) -> HResult<()> {
+        let cwd = self.cwd()?;
+        let file = self.selected_file()?;
+
+        let cmd = crate::proclist::Cmd {
+            cmd: OsString::from(file.strip_prefix(&cwd)),
+            short_cmd: None,
+            args: None,
+            cwd: cwd.clone(),
+            cwd_files: None,
+            tab_files: None,
+            tab_paths: None
+        };
+
+        self.proc_view.lock()?.run_proc_raw(cmd)?;
+
+        Ok(())
+    }
+
     pub fn main_widget_goto(&mut self, dir: &File) -> HResult<()> {
         match dir.is_readable() {
             Ok(true) => {},
@@ -665,58 +684,28 @@ impl FileBrowser {
     fn exec_cmd(&mut self,
                 tab_dirs: Vec<File>,
                 tab_files: Vec<Vec<File>>) -> HResult<()> {
-        let cwd = self.cwd()?;
-        let filename = self.selected_file()?.path.quoted_file_name()?;
+
+        let cwd = self.cwd()?.clone();
+        let selected_file = self.selected_file()?;
         let selected_files = self.selected_files()?;
 
-        let files = selected_files.iter()
-            .map(|f| f.path())
-            .collect::<Vec<PathBuf>>();
+        let cmd = self.minibuffer("exec")?.trim_start().to_string() + " ";
 
-        let cmd = self.minibuffer("exec")?.trim_start().to_string();
+        let cwd_files = if selected_files.len() == 0 {
+            vec![selected_file]
+        } else { selected_files };
 
-        let cmd = OsString::from(cmd);
-        let space = OsString::from(" ");
-
-        let mut cmd = if files.len() == 0 {
-            cmd.replace(&OsString::from("$s"), &filename)
-        } else {
-            let args = files.iter()
-                .fold(OsString::new(), |mut args, file| {
-                    if let Some(name) = file.quoted_file_name() {
-                        args.push(name);
-                        args.push(space.clone());
-                    }
-                    args
-                });
-            let args = args.trim_last_space();
-
-            cmd.replace(&OsString::from("$s"), &args)
+        let cmd = crate::proclist::Cmd {
+            cmd: OsString::from(cmd),
+            short_cmd: None,
+            args: None,
+            cwd: cwd,
+            cwd_files: Some(cwd_files),
+            tab_files: Some(tab_files),
+            tab_paths: Some(tab_dirs)
         };
 
-        for (i, tab_dir) in tab_dirs.iter().enumerate() {
-            if let Some(tab_files) = tab_files.get(i) {
-                let tab_file_identifier = OsString::from(format!("${}s", i));
-
-                let args = tab_files.iter()
-                    .fold(OsString::new(), |mut args, file| {
-                        let file_path = file.strip_prefix(&cwd);
-                        let name = file_path.quoted_path();
-                        args.push(name);
-                        args.push(space.clone());
-
-                        args
-                    });
-
-                cmd = cmd.replace(&tab_file_identifier, &args);
-            }
-
-            let tab_identifier = OsString::from(format!("${}", i));
-            let tab_path = tab_dir.path().into_os_string();
-            cmd = cmd.replace(&tab_identifier, &tab_path);
-        }
-
-        self.proc_view.lock()?.run_proc(&cmd)?;
+        self.proc_view.lock()?.run_proc_subshell(cmd)?;
 
         Ok(())
     }
@@ -856,6 +845,7 @@ impl Widget for FileBrowser {
             Key::Char('/') => { self.turbo_cd()?; },
             Key::Char('Q') => { self.quit_with_dir()?; },
             Key::Right | Key::Char('f') => { self.enter_dir()?; },
+            Key::Char('F') => { self.open_bg()?; },
             Key::Left | Key::Char('b') => { self.go_back()?; },
             Key::Char('-') => { self.goto_prev_cwd()?; },
             Key::Char('`') => { self.goto_bookmark()?; },
diff --git a/src/files.rs b/src/files.rs
index 54e9049..1a038ac 100644
--- a/src/files.rs
+++ b/src/files.rs
@@ -517,6 +517,10 @@ impl File {
     }
 
     pub fn strip_prefix(&self, base: &File) -> PathBuf {
+        if self == base {
+            return PathBuf::from("./");
+        }
+
         let base_path = base.path.clone();
         match self.path.strip_prefix(base_path) {
             Ok(path) => PathBuf::from(path),
@@ -741,13 +745,105 @@ impl PathBufExt for PathBuf {
 }
 
 pub trait OsStrTools {
+    fn split(&self, pat: &OsStr) -> Vec<OsString>;
     fn replace(&self, from: &OsStr, to: &OsStr) -> OsString;
     fn trim_last_space(&self) -> OsString;
     fn contains_osstr(&self, pat: &OsStr) -> bool;
     fn position(&self, pat: &OsStr) -> Option<usize>;
+    fn splice_quoted(&self, from: &OsStr, to: Vec<OsString>) -> Vec<OsString>;
+    fn splice_with(&self, from: &OsStr, to: Vec<OsString>) -> Vec<OsString>;
+    fn quote(&self) -> OsString;
 }
 
 impl OsStrTools for OsStr {
+    fn split(&self, pat: &OsStr) -> Vec<OsString> {
+        let orig_string = self.as_bytes().to_vec();
+        let pat = pat.as_bytes().to_vec();
+        let pat_len = pat.len();
+
+        dbg!(&self);
+
+        let split_string = orig_string
+            .windows(pat_len)
+            .enumerate()
+            .fold(Vec::new(), |mut split_pos, (i, chars)| {
+                dbg!(&chars);
+                dbg!(&split_pos);
+                if chars == pat.as_slice() {
+                    if split_pos.len() == 0 {
+                        split_pos.push((0, i));
+                    } else {
+                        let len = split_pos.len();
+                        let last_split = split_pos[len-1].1;
+                        split_pos.push((last_split, i));
+                    }
+                }
+                split_pos
+            }).iter()
+            .map(|(start, end)| {
+                //let orig_string = orig_string.clone();
+                OsString::from_vec(orig_string[*start..*end]
+                                   .to_vec()).replace(&OsString::from_vec(pat.clone()),
+                                                      &OsString::from(""))
+            }).collect();
+        split_string
+    }
+
+
+    fn quote(&self) -> OsString {
+        let mut string = self.as_bytes().to_vec();
+        let mut quote = "\"".as_bytes().to_vec();
+
+        let mut quoted = vec![];
+        quoted.append(&mut quote.clone());
+        quoted.append(&mut string);
+        quoted.append(&mut quote);
+
+        OsString::from_vec(quoted)
+    }
+
+    fn splice_quoted(&self, from: &OsStr, to: Vec<OsString>) -> Vec<OsString> {
+        let quoted_to = to.iter()
+            .map(|to| to.quote())
+            .collect();
+        self.splice_with(from, quoted_to)
+    }
+
+    fn splice_with(&self, from: &OsStr, to: Vec<OsString>) -> Vec<OsString> {
+        let pos = self.position(from);
+
+        if pos.is_none() {
+            return vec![OsString::from(self)];
+        }
+
+        dbg!(&self);
+
+        let pos = pos.unwrap();
+        let string = self.as_bytes().to_vec();
+        let from = from.as_bytes().to_vec();
+        let fromlen = from.len();
+
+        let lpart = OsString::from_vec(string[0..pos].to_vec());
+        let rpart = OsString::from_vec(string[pos+fromlen..].to_vec());
+
+        dbg!(&lpart);
+        dbg!(&rpart);
+
+        let mut result = vec![
+            vec![lpart.trim_last_space()],
+            to,
+            vec![rpart]
+        ].into_iter()
+            .flatten()
+            .filter(|part| part.len() != 0)
+            .collect::<Vec<OsString>>();
+
+        if result.last() == Some(&OsString::from("")) {
+            result.pop();
+            result
+        } else { result }
+    }
+
     fn replace(&self, from: &OsStr, to: &OsStr) -> OsString {
         let orig_string = self.as_bytes().to_vec();
         let from = from.as_bytes();
diff --git a/src/paths.rs b/src/paths.rs
index b3f3e1d..8917756 100644
--- a/src/paths.rs
+++ b/src/paths.rs
@@ -10,9 +10,15 @@ pub fn home_path() -> HResult<PathBuf> {
 }
 
 pub fn hunter_path() -> HResult<PathBuf> {
-    let mut config_dir = dirs_2::config_dir()?;
-    config_dir.push("hunter/");
-    Ok(config_dir)
+    let mut hunter_path = dirs_2::config_dir()?;
+    hunter_path.push("hunter/");
+    Ok(hunter_path)
+}
+
+pub fn config_path() -> HResult<PathBuf> {
+    let mut config_path = hunter_path()?;
+    config_path.push("config");
+    Ok(config_path)
 }
 
 pub fn bookmark_path() -> HResult<PathBuf> {
diff --git a/src/proclist.rs b/src/proclist.rs
index a841b44..a4efabf 100644
--- a/src/proclist.rs
+++ b/src/proclist.rs
@@ -4,6 +4,7 @@ use std::process::Child;
 use std::os::unix::process::{CommandExt, ExitStatusExt};
 use std::io::{BufRead, BufReader};
 use std::ffi::OsString;
+use std::os::unix::ffi::{OsStringExt, OsStrExt};
 
 use termion::event::Key;
 use unicode_width::UnicodeWidthStr;
@@ -17,7 +18,7 @@ use crate::hbox::HBox;
 use crate::preview::WillBeWidget;
 use crate::fail::{HResult, HError, ErrorLog};
 use crate::term;
-use crate::files::OsStrTools;
+use crate::files::{File, OsStrTools};
 
 #[derive(Debug)]
 struct Process {
@@ -30,6 +31,75 @@ struct Process {
 
 }
 
+pub struct Cmd {
+    pub cmd: OsString,
+    pub args: Option<Vec<OsString>>,
+    pub short_cmd: Option<String>,
+    pub cwd: File,
+    pub cwd_files: Option<Vec<File>>,
+    pub tab_files: Option<Vec<Vec<File>>>,
+    pub tab_paths: Option<Vec<File>>,
+}
+
+impl Cmd {
+    fn process(&mut self) -> Vec<OsString> {
+        let cmd = self.cmd.clone().split(&OsString::from(" "));
+        let cmd = self.substitute_cwd_files(cmd);
+        let cmd = self.substitute_tab_files(cmd);
+        let cmd = self.substitute_tab_paths(cmd);
+        cmd
+    }
+
+    fn substitute_cwd_files(&mut self, cmd: Vec<OsString>) -> Vec<OsString> {
+        let cwd_pat = OsString::from("$s");
+        let cwd_files =  self.cwd_files
+            .take()
+            .unwrap()
+            .iter()
+            .map(|file| file.strip_prefix(&self.cwd).into_os_string())
+            .collect::<Vec<OsString>>();
+
+        cmd.iter()
+            .map(|part| part.splice_quoted(&cwd_pat,
+                                         cwd_files.clone()))
+            .flatten().collect()
+    }
+
+    fn substitute_tab_files(&mut self, cmd: Vec<OsString>) -> Vec<OsString> {
+        let tab_files = self.tab_files.take().unwrap();
+
+        tab_files.into_iter()
+            .enumerate()
+            .fold(cmd, |cmd, (i, tab_files)| {
+                let tab_files_pat = OsString::from(format!("${}s", i));
+                let tab_file_paths = tab_files.iter()
+                    .map(|file| file.strip_prefix(&self.cwd).into_os_string())
+                    .collect::<Vec<OsString>>();
+
+                cmd.iter().map(|part| {
+                    part.splice_quoted(&tab_files_pat,
+                                       tab_file_paths.clone())
+                }).flatten().collect()
+            })
+    }
+
+    fn substitute_tab_paths(&mut self, cmd: Vec<OsString>) -> Vec<OsString> {
+        let tab_paths = self.tab_paths.take().unwrap();
+
+        tab_paths.into_iter()
+            .enumerate()
+            .fold(cmd, |cmd, (i, tab_path)| {
+                let tab_path_pat = OsString::from(format!("${}", i));
+                let tab_path = tab_path.strip_prefix(&self.cwd).into_os_string();
+
+                cmd.iter().map(|part| {
+                    part.splice_quoted(&tab_path_pat,
+                                     vec![tab_path.clone()])
+                }).flatten().collect()
+            })
+    }
+}
+
 impl PartialEq for Process {
     fn eq(&self, other: &Process) -> bool {
         self.cmd == other.cmd
@@ -120,17 +190,44 @@ impl Listable for ListView<Vec<Process>> {
 }
 
 impl ListView<Vec<Process>> {
-    fn run_proc(&mut self, cmd: &OsString) -> HResult<()> {
+    fn run_proc_subshell(&mut self, mut cmd: Cmd) -> HResult<()> {
         let shell = std::env::var("SHELL").unwrap_or("sh".into());
         let home = crate::paths::home_path()?.into_os_string();
+
+        let cmd_args = cmd.process();
+
         let short = OsString::from("~");
-        let short_cmd = cmd.replace(&home, &short).to_string_lossy().to_string();
+        let short_cmd = cmd_args
+            .concat()
+            .replace(&home, &short)
+            .replace(&OsString::from("\""), &OsString::from(""))
+            .to_string_lossy()
+            .to_string();
 
         self.show_status(&format!("Running: {}", &short_cmd)).log();
 
-        let handle = std::process::Command::new(shell)
-            .arg("-c")
-            .arg(cmd)
+        let shell_args = cmd_args.concat();
+        let shell_args = vec![OsString::from("-c"), shell_args.clone()];
+
+        cmd.cmd = OsString::from(shell.clone());
+        cmd.args = Some(shell_args.clone());
+        cmd.short_cmd = Some(short_cmd);
+
+        self.run_proc_raw(cmd)
+    }
+
+    fn run_proc_raw(&mut self, cmd: Cmd) -> HResult<()> {
+        let real_cmd = cmd.cmd;
+        let short_cmd = cmd.short_cmd
+            .unwrap_or(real_cmd
+                       .to_string_lossy()
+                       .to_string());
+        let args = cmd.args.unwrap_or(vec![]);
+
+        self.show_status(&format!("Running: {}", &short_cmd)).log();
+
+        let handle = std::process::Command::new(real_cmd)
+            .args(args)
             .stdin(std::process::Stdio::null())
             .stdout(std::process::Stdio::piped())
             .before_exec(|| unsafe { libc::dup2(1, 2); Ok(()) })
@@ -289,8 +386,13 @@ impl ProcView {
         self.hbox.get_textview()
     }
 
-    pub fn run_proc(&mut self, cmd: &OsString) -> HResult<()> {
-        self.get_listview_mut().run_proc(cmd)?;
+    pub fn run_proc_subshell(&mut self, cmd: Cmd) -> HResult<()> {
+        self.get_listview_mut().run_proc_subshell(cmd)?;
+        Ok(())
+    }
+
+    pub fn run_proc_raw(&mut self, cmd: Cmd) -> HResult<()> {
+        self.get_listview_mut().run_proc_raw(cmd)?;
         Ok(())
     }
 
@@ -467,3 +569,50 @@ impl Widget for ProcView {
         Ok(())
     }
 }
+
+
+trait ConcatOsString {
+    fn concat(&self) -> OsString;
+    fn concat_quoted(&self) -> OsString;
+}
+
+impl ConcatOsString for Vec<OsString> {
+    fn concat(&self) -> OsString {
+        let len = self.len();
+        self.iter().enumerate().fold(OsString::new(), |string, (i, part)| {
+            let mut string = string.into_vec();
+            let mut space = " ".as_bytes().to_vec();
+            let mut part = part.clone().into_vec();
+
+            string.append(&mut part);
+
+            if i != len {
+                string.append(&mut space);
+            }
+
+            OsString::from_vec(string)
+        })
+    }
+
+    fn concat_quoted(&self) -> OsString {
+        let len = self.len();
+        self.iter().enumerate().fold(OsString::new(), |string, (i, part)| {
+            let mut string = string.into_vec();
+            let mut space = " ".as_bytes().to_vec();
+            let mut quote = "\"".as_bytes().to_vec();
+            let mut part = part.clone().into_vec();
+
+
+            string.append(&mut quote.clone());
+            string.append(&mut part);
+            string.append(&mut quote);
+
+
+            if i+1 != len {
+                string.append(&mut space);
+            }
+
+            OsString::from_vec(string)
+        })
+    }
+}