diff --git a/Cargo.toml b/Cargo.toml
index e152f60..9342f32 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,3 +11,9 @@ clap_complete = "4.0.6"
 clap_complete_nushell = "0.1.8"
 clap_mangen = "0.2.5"
 hostname = { version = "0.3", features = ["set"] }
+
+[profile.release]
+codegen-units = 1
+strip = true
+lto = true
+
diff --git a/src/cmd/bootstrap/mod.rs b/src/cmd/bootstrap/mod.rs
index c1b435c..f0800b9 100644
--- a/src/cmd/bootstrap/mod.rs
+++ b/src/cmd/bootstrap/mod.rs
@@ -1,17 +1,18 @@
 use crate::cmd;
-use clap::{value_parser, Arg, ArgMatches, Command};
+use clap::{value_parser, Arg, ArgMatches, Command, ArgAction};
+use clap_complete::{generate_to, shells};
 use clap_mangen::Man;
-use std::{fs, io, path::PathBuf, process};
+use std::{fs, io, path::{Path, PathBuf}, process};
 
-const programs: [&str; 8] = [
-    "shitbox",
-    "bootstrap",
-    "echo",
-    "false",
-    "head",
-    "hostname",
-    "true",
-    "sleep",
+const COMMANDS: [fn() -> clap::Command; 8] = [
+    cmd::bootstrap::cli,
+    cmd::echo::cli,
+    cmd::r#false::cli,
+    cmd::head::cli,
+    cmd::hostname::cli,
+    cmd::r#true::cli,
+    cmd::sleep::cli,
+    crate::cli::cli,
 ];
 
 #[must_use]
@@ -60,38 +61,37 @@ pub fn cli() -> Command {
                     Arg::new("all")
                         .help("Install completions for all supported shells")
                         .short('a')
-                        .long("all"),
+                        .long("all")
+                        .action(ArgAction::SetTrue),
                     Arg::new("bash")
                         .help("Bash shell completions")
                         .short('b')
-                        .long("bash"),
+                        .long("bash")
+                        .action(ArgAction::SetTrue),
                     Arg::new("fish")
                         .help("Fish shell completions")
                         .short('f')
-                        .long("fish"),
+                        .long("fish")
+                        .action(ArgAction::SetTrue),
                     Arg::new("nu")
                         .help("Nushell completions")
                         .short('n')
-                        .long("nu"),
+                        .long("nu")
+                        .action(ArgAction::SetTrue),
                     Arg::new("pwsh")
                         .help("PowerShell completions")
                         .short('p')
-                        .long("pwsh"),
+                        .long("pwsh")
+                        .action(ArgAction::SetTrue),
                 ]),
         ])
 }
 
-fn manpage(prefix: &str, cmd: &str) -> Result<(), io::Error> {
-    let (fname, cmd) = match cmd {
-        "shitbox" => ("shitbox.1", crate::cli::cli()),
-        "bootstrap" => ("shitbox-bootstrap.1", cli()),
-        "echo" => ("echo.1", cmd::echo::cli()),
-        "false" => ("false.1", cmd::r#false::cli()),
-        "head" => ("head.1", cmd::head::cli()),
-        "hostname" => ("hostname.1", cmd::hostname::cli()),
-        "true" => ("true.1", cmd::r#true::cli()),
-        "sleep" => ("sleep.1", cmd::sleep::cli()),
-        _ => unimplemented!(),
+fn manpage(prefix: &str, f: &dyn Fn() -> Command) -> Result<(), io::Error> {
+    let cmd = f();
+    let fname = match cmd.get_name() {
+        "bootstrap" => "shitbox-bootstrap.1".to_string(),
+        s => format!("{s}.1"),
     };
     let outdir: PathBuf = [prefix, "usr", "share", "man", "man1"].iter().collect();
     if !outdir.exists() {
@@ -109,7 +109,56 @@ fn manpage(prefix: &str, cmd: &str) -> Result<(), io::Error> {
 
 fn manpages(prefix: &str) -> Result<(), io::Error> {
     println!("Generating Unix man pages:");
-    programs.iter().try_for_each(|cmd| manpage(prefix, cmd))?;
+    COMMANDS.iter().try_for_each(|cmd| {
+        manpage(prefix, &cmd)
+    })?;
+    Ok(())
+}
+
+fn gen_bash_completion(outdir: &Path, f: &dyn Fn() -> Command) -> Result<(), io::Error> {
+    let cmd = f();
+    let name = cmd.get_name();
+    let mut cmd = cmd.clone();
+    let path = generate_to(shells::Bash, &mut cmd, name, outdir)?;
+    println!("    {}", path.display());
+    Ok(())
+}
+
+fn gen_fish_completion(outdir: &Path, f: &dyn Fn() -> Command) -> Result<(), io::Error> {
+    let cmd = f();
+    let name = cmd.get_name();
+    let mut cmd = cmd.clone();
+    let path = generate_to(shells::Fish, &mut cmd, name, outdir)?;
+    println!("    {}", path.display());
+    Ok(())
+}
+
+fn completions(prefix: &str, matches: &ArgMatches) -> Result<(), io::Error> {
+    println!("Generating completions:");
+    if matches.get_flag("bash") || matches.get_flag("all") {
+        let outdir: PathBuf = [prefix, "share", "bash-completion", "completion"]
+            .iter()
+            .collect();
+        if !outdir.exists() {
+            fs::create_dir_all(&outdir)?;
+        }
+        COMMANDS.iter().try_for_each(|cmd| gen_bash_completion(&outdir, &cmd) )?;
+    }
+    if matches.get_flag("fish") || matches.get_flag("all") {
+        let outdir: PathBuf = ["target", "dist", "share", "fish", "completions"]
+            .iter()
+            .collect();
+        if !outdir.exists() {
+            fs::create_dir_all(&outdir)?;
+        }
+        COMMANDS.iter().try_for_each(|cmd| gen_fish_completion(&outdir, &cmd) )?;
+    }
+    if matches.get_flag("nu") || matches.get_flag("all") {
+    }
+    if matches.get_flag("pwsh") || matches.get_flag("all") {
+    }
+    if matches.get_flag("zsh") || matches.get_flag("all") {
+    }
     Ok(())
 }
 
@@ -117,7 +166,19 @@ pub fn run(matches: &ArgMatches) {
     if let Some(prefix) = matches.get_one::<String>("prefix") {
         match matches.subcommand() {
             Some(("manpages", _matches)) => {
-                if let Err(e) = manpages(&prefix) {
+                if let Err(e) = manpages(prefix) {
+                    eprintln!("{e}");
+                    process::exit(1);
+                }
+            }
+            Some(("completions", matches)) => {
+                if let Err(e) = completions(prefix, matches) {
+                    eprintln!("{e}");
+                    process::exit(1);
+                }
+            }
+            Some(("all", _matches)) => {
+                if let Err(e) = manpages(prefix) {
                     eprintln!("{e}");
                     process::exit(1);
                 }
diff --git a/src/cmd/head/mod.rs b/src/cmd/head/mod.rs
index b25f08c..3db8e50 100644
--- a/src/cmd/head/mod.rs
+++ b/src/cmd/head/mod.rs
@@ -42,6 +42,7 @@ pub fn cli() -> Command {
                 .short('n')
                 .long("lines")
                 .default_value("10")
+                .allow_negative_numbers(false)
                 .value_parser(value_parser!(usize))
                 ])
 }
diff --git a/src/cmd/sleep/mod.rs b/src/cmd/sleep/mod.rs
index c22cf81..b3055c3 100644
--- a/src/cmd/sleep/mod.rs
+++ b/src/cmd/sleep/mod.rs
@@ -19,6 +19,7 @@ pub fn cli() -> Command {
             Arg::new("seconds")
                 .help("The number of seconds to sleep")
                 .num_args(1)
+                .allow_negative_numbers(false)
                 .value_parser(value_parser!(f64))
                 .required(true)
                 .action(ArgAction::Set)