diff --git a/Cargo.lock b/Cargo.lock
index 0205dd5..cf14d81 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,6 @@
 [root]
 name = "fd-find"
-version = "4.0.0"
+version = "5.0.0"
 dependencies = [
  "ansi_term 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "atty 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index 969160a..4e51db4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ license = "MIT/Apache-2.0"
 name = "fd-find"
 readme = "README.md"
 repository = "https://github.com/sharkdp/fd"
-version = "4.0.0"
+version = "5.0.0"
 
 [[bin]]
 name = "fd"
diff --git a/README.md b/README.md
index 003c640..d580079 100644
--- a/README.md
+++ b/README.md
@@ -171,6 +171,7 @@ FLAGS:
     -H, --hidden            Search hidden files and directories
     -I, --no-ignore         Do not respect .(git)ignore files
     -s, --case-sensitive    Case-sensitive search (default: smart case)
+    -i, --ignore-case       Case-insensitive search (default: smart case)
     -a, --absolute-path     Show absolute instead of relative paths
     -L, --follow            Follow symbolic links
     -p, --full-path         Search full path (default: file-/dirname only)
@@ -182,10 +183,9 @@ OPTIONS:
     -d, --max-depth <depth>    Set maximum search depth (default: none)
     -t, --type <filetype>      Filter by type: f(ile), d(irectory), (sym)l(ink)
     -e, --extension <ext>      Filter by file extension
-    -c, --color <when>         When to use color in the output:
-                               never, auto, always (default: auto)
-    -j, --threads <num>        Set number of threads to use for searching:
-                               (default: number of available CPU cores)
+    -c, --color <when>         When to use colors: never, *auto*, always
+    -j, --threads <num>        Set number of threads to use for searching & executing
+    -x, --exec <cmd>           Execute the given command for each search result
 
 ARGS:
     <pattern>    the search pattern, a regular expression (optional)
diff --git a/src/app.rs b/src/app.rs
index d26a125..991036b 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -103,7 +103,13 @@ pub fn build_app() -> App<'static, 'static> {
                 .takes_value(true)
                 .hidden(true),
         )
-        .arg(arg("exec").long("exec").short("x").takes_value(true))
+        .arg(
+            arg("exec")
+                .long("exec")
+                .short("x")
+                .takes_value(true)
+                .value_name("cmd"),
+        )
         .arg(arg("pattern"))
         .arg(arg("path"))
 }
@@ -153,9 +159,8 @@ fn usage() -> HashMap<&'static str, Help> {
              'd' or 'directory':    directories\n  \
              'l' or 'symlink':      symbolic links");
     doc!(h, "exec"
-        , "Execute each discovered path using the argument that follows as the command expression."
-        , "Execute each discovered path using the argument that follows as the command \
-           expression.\n \
+        , "Execute the given command for each search result"
+        , "Execute the given command for each search result.\n\
            The following are valid tokens that can be used within the expression for generating \
            commands:\n \
              '{}':   places the input in the location of this token\n \
diff --git a/src/exec/job.rs b/src/exec/job.rs
index 389fc67..4ca518e 100644
--- a/src/exec/job.rs
+++ b/src/exec/job.rs
@@ -38,7 +38,7 @@ pub fn job(
         drop(lock);
         // Generate a command to store within the buffer, and execute the command.
         // Note that the `then_execute()` method will clear the buffer for us.
-        cmd.generate(buffer, &value, out_perm.clone())
+        cmd.generate(buffer, &value, Arc::clone(&out_perm))
             .then_execute();
     }
 }
diff --git a/src/exec/ticket.rs b/src/exec/ticket.rs
index 75d4bf6..7e3dcaf 100644
--- a/src/exec/ticket.rs
+++ b/src/exec/ticket.rs
@@ -17,7 +17,7 @@ lazy_static! {
     static ref COMMAND: (String, &'static str) = if cfg!(target_os = "windows") {
         ("cmd".into(), "/C")
     } else {
-        (env::var("SHELL").unwrap_or("/bin/sh".into()), "-c")
+        (env::var("SHELL").unwrap_or_else(|_| "/bin/sh".into()), "-c")
     };
 }
 
diff --git a/src/internal.rs b/src/internal.rs
index 65c72aa..a4c21f0 100644
--- a/src/internal.rs
+++ b/src/internal.rs
@@ -102,7 +102,7 @@ fn expr_has_uppercase_char(expr: &Expr) -> bool {
                 r.start.is_uppercase() || r.end.is_uppercase()
             })
         }
-        Expr::Group { ref e, .. } => expr_has_uppercase_char(e),
+        Expr::Group { ref e, .. } |
         Expr::Repeat { ref e, .. } => expr_has_uppercase_char(e),
         Expr::Concat(ref es) => es.iter().any(expr_has_uppercase_char),
         Expr::Alternate(ref es) => es.iter().any(expr_has_uppercase_char),
diff --git a/src/lscolors/mod.rs b/src/lscolors/mod.rs
index a6afa65..65ac193 100644
--- a/src/lscolors/mod.rs
+++ b/src/lscolors/mod.rs
@@ -17,7 +17,7 @@ pub type ExtensionStyles = HashMap<String, Style>;
 /// Maps filenames to ANSI colors / styles.
 pub type FilenameStyles = HashMap<String, Style>;
 
-const LS_CODES: &'static [&'static str] = &[
+const LS_CODES: &[&str] = &[
     "no",
     "no",
     "fi",
diff --git a/src/main.rs b/src/main.rs
index b39224b..736a9f8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -52,7 +52,7 @@ fn main() {
 
     // Get the current working directory
     let current_dir = Path::new(".");
-    if !fshelper::is_dir(&current_dir) {
+    if !fshelper::is_dir(current_dir) {
         error("Error: could not get current directory.");
     }
 
@@ -103,7 +103,7 @@ fn main() {
         None
     };
 
-    let command = matches.value_of("exec").map(|x| TokenizedCommand::new(&x));
+    let command = matches.value_of("exec").map(|x| TokenizedCommand::new(x));
 
     let config = FdOptions {
         case_sensitive,
diff --git a/src/walk.rs b/src/walk.rs
index 5689042..3a399e8 100644
--- a/src/walk.rs
+++ b/src/walk.rs
@@ -76,9 +76,9 @@ pub fn scan(root: &Path, pattern: Arc<Regex>, config: Arc<FdOptions>) {
             // Each spawned job will store it's thread handle in here.
             let mut handles = Vec::with_capacity(threads);
             for _ in 0..threads {
-                let rx = shared_rx.clone();
-                let cmd = cmd.clone();
-                let out_perm = out_perm.clone();
+                let rx = Arc::clone(&shared_rx);
+                let cmd = Arc::clone(&cmd);
+                let out_perm = Arc::clone(&out_perm);
 
                 // Spawn a job thread that will listen for and execute inputs.
                 let handle = thread::spawn(move || exec::job(rx, cmd, out_perm));
@@ -113,7 +113,7 @@ pub fn scan(root: &Path, pattern: Arc<Regex>, config: Arc<FdOptions>) {
                         if time::Instant::now() - start > max_buffer_time {
                             // Flush the buffer
                             for v in &buffer {
-                                output::print_entry(&v, &rx_config);
+                                output::print_entry(v, &rx_config);
                             }
                             buffer.clear();
 
@@ -188,7 +188,7 @@ pub fn scan(root: &Path, pattern: Arc<Regex>, config: Arc<FdOptions>) {
             }
 
             let search_str_o = if config.search_full_path {
-                match fshelper::path_absolute_form(&entry_path) {
+                match fshelper::path_absolute_form(entry_path) {
                     Ok(path_abs_buf) => Some(path_abs_buf.to_string_lossy().into_owned().into()),
                     Err(_) => error("Error: unable to get full path."),
                 }