diff --git a/Makefile b/Makefile
index 068c057..e3643eb 100644
--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ user-rust:
 			-C relocation-model=static
 	basename -s .rs src/bin/*.rs | xargs -I {} \
 		cp target/x86_64-moros/release/{} dsk/bin/{}
-	strip dsk/bin/*
+	#strip dsk/bin/*
 
 bin = target/x86_64-moros/release/bootimage-moros.bin
 img = disk.img
diff --git a/doc/lisp.md b/doc/lisp.md
index 4cd2f8a..4a46eaf 100644
--- a/doc/lisp.md
+++ b/doc/lisp.md
@@ -46,7 +46,7 @@ MOROS Lisp v0.1.0
 > (+ 1 2)
 3
 
-> (exit)
+> (quit)
 ```
 
 And it can execute a file. For example a file located in `/tmp/fibonacci.lsp`
diff --git a/doc/shell.md b/doc/shell.md
index f6ea106..bb689a6 100644
--- a/doc/shell.md
+++ b/doc/shell.md
@@ -1,15 +1,20 @@
 # MOROS Shell
 
+## Config
+
+The shell will read `/ini/shell.sh` during initialization to setup its
+configuration.
+
 ## Commands
 
 The main commands have a long name, a one-letter alias, and may have
 additional common aliases.
 
-<!--
 **Alias** command:
 
     > alias d delete
 
+<!--
 **Append** to file:
 
     > a a.txt
@@ -130,20 +135,26 @@ Which is more efficient than doing:
 
 Setting a variable in the shell environment is done with the following command:
 
-    > foo = "world"
+    > set foo 42
 
-And accessing that variable is done with the `$` operator:
+    > set bar "Alice and Bob"
+
+And accessing a variable is done with the `$` operator:
 
     > print $foo
-    world
+    42
 
-    > print "hello $foo"
-    hello world
+    > print "Hello $bar"
+    Hello Alice and Bob
 
 The process environment is copied to the shell environment when a session is
 started. By convention a process env var should be in uppercase and a shell
 env var should be lowercase.
 
+Unsetting a variable is done like this:
+
+    > unset foo
+
 ## Globbing
 
 MOROS Shell support filename expansion or globbing for `*` and `?` wildcard
diff --git a/dsk/bin/clear b/dsk/bin/clear
index ff53afd..80664c3 100644
Binary files a/dsk/bin/clear and b/dsk/bin/clear differ
diff --git a/dsk/bin/halt b/dsk/bin/halt
index 65e3a90..8abda29 100644
Binary files a/dsk/bin/halt and b/dsk/bin/halt differ
diff --git a/dsk/bin/hello b/dsk/bin/hello
index 0e17de4..60827a8 100755
Binary files a/dsk/bin/hello and b/dsk/bin/hello differ
diff --git a/dsk/bin/print b/dsk/bin/print
index 6920fbc..3cc9af1 100644
Binary files a/dsk/bin/print and b/dsk/bin/print differ
diff --git a/dsk/bin/reboot b/dsk/bin/reboot
index c83f324..23841eb 100644
Binary files a/dsk/bin/reboot and b/dsk/bin/reboot differ
diff --git a/dsk/bin/sleep b/dsk/bin/sleep
index 9fe01fd..3318411 100644
Binary files a/dsk/bin/sleep and b/dsk/bin/sleep differ
diff --git a/dsk/ini/shell.sh b/dsk/ini/shell.sh
new file mode 100644
index 0000000..dbe4ede
--- /dev/null
+++ b/dsk/ini/shell.sh
@@ -0,0 +1,28 @@
+# Command shortcuts
+alias p    print
+alias c    copy
+alias d    delete
+alias del  delete
+alias e    edit
+alias f    find
+alias g    goto
+alias go   goto
+alias h    help
+alias l    list
+alias m    move
+alias q    quit
+alias r    read
+alias w    write
+alias sh   shell
+alias dsk  disk
+alias mem  memory
+alias kbd  keyboard
+
+# Unix compatibility
+# alias cd   goto
+# alias cp   copy
+# alias echo print
+# alias exit quit
+# alias ls   list
+# alias mv   move
+# alias rm   delete
diff --git a/src/main.rs b/src/main.rs
index 7b1921d..85622ae 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,10 +14,9 @@ fn main(boot_info: &'static BootInfo) -> ! {
     print!("\x1b[?25h"); // Enable cursor
     loop {
         if let Some(cmd) = option_env!("MOROS_CMD") {
-            let mut env = usr::shell::default_env();
             let prompt = usr::shell::prompt_string(true);
             println!("{}{}", prompt, cmd);
-            usr::shell::exec(cmd, &mut env);
+            usr::shell::exec(cmd);
             sys::acpi::shutdown();
         } else {
             user_boot();
diff --git a/src/usr/calc.rs b/src/usr/calc.rs
index ed9e88f..7698124 100644
--- a/src/usr/calc.rs
+++ b/src/usr/calc.rs
@@ -118,7 +118,7 @@ fn repl() -> usr::shell::ExitCode {
     prompt.history.load(history_file);
 
     while let Some(line) = prompt.input(&prompt_string) {
-        if line == "exit" || line == "quit" {
+        if line == "quit" {
             break;
         }
         if line.is_empty() {
diff --git a/src/usr/chess.rs b/src/usr/chess.rs
index ee1ab9b..72d643d 100644
--- a/src/usr/chess.rs
+++ b/src/usr/chess.rs
@@ -86,7 +86,7 @@ impl Chess {
         while let Some(cmd) = prompt.input(&prompt_string) {
             let args: Vec<&str> = cmd.trim().split(' ').collect();
             match args[0] {
-                "q" | "quit" | "exit" => break,
+                "q" | "quit" => break,
                 "h" | "help" => self.cmd_help(args),
                 "i" | "init" => self.cmd_init(args),
                 "t" | "time" => self.cmd_time(args),
diff --git a/src/usr/env.rs b/src/usr/env.rs
index b4421a4..b6095dc 100644
--- a/src/usr/env.rs
+++ b/src/usr/env.rs
@@ -1,22 +1,30 @@
 use crate::{sys, usr};
 
 pub fn main(args: &[&str]) -> usr::shell::ExitCode {
-    if args.len() == 1 {
-        for (key, val) in sys::process::envs() {
-            println!("{}={}", key, val);
+    match args.len() {
+        1 => {
+            for (key, val) in sys::process::envs() {
+                println!("{:10} \"{}\"", key, val);
+            }
+            usr::shell::ExitCode::CommandSuccessful
         }
-    } else {
-        for arg in args[1..].iter() {
-            if let Some(i) = arg.find('=') {
-                let (key, mut val) = arg.split_at(i);
-                val = &val[1..];
-                sys::process::set_env(key, val);
-                println!("{}={}", key, val);
+        2 => {
+            let key = args[1];
+            if let Some(val) = sys::process::env(key) {
+                println!("{}", val);
+                usr::shell::ExitCode::CommandSuccessful
             } else {
-                error!("Error: could not parse '{}'", arg);
-                return usr::shell::ExitCode::CommandError;
+                error!("Could not get '{}'", key);
+                usr::shell::ExitCode::CommandError
             }
         }
+        3 => {
+            sys::process::set_env(args[1], args[2]);
+            usr::shell::ExitCode::CommandSuccessful
+        }
+        _ => {
+            error!("Invalid number of arguments");
+            usr::shell::ExitCode::CommandError
+        }
     }
-    usr::shell::ExitCode::CommandSuccessful
 }
diff --git a/src/usr/install.rs b/src/usr/install.rs
index 114e707..2504296 100644
--- a/src/usr/install.rs
+++ b/src/usr/install.rs
@@ -32,10 +32,11 @@ pub fn copy_files(verbose: bool) {
     create_dev("/dev/random", DeviceType::Random, verbose);
     create_dev("/dev/console", DeviceType::Console, verbose);
 
-    copy_file("/ini/boot.sh", include_bytes!("../../dsk/ini/boot.sh"), verbose);
     copy_file("/ini/banner.txt", include_bytes!("../../dsk/ini/banner.txt"), verbose);
-    copy_file("/ini/version.txt", include_bytes!("../../dsk/ini/version.txt"), verbose);
+    copy_file("/ini/boot.sh", include_bytes!("../../dsk/ini/boot.sh"), verbose);
     copy_file("/ini/palette.csv", include_bytes!("../../dsk/ini/palette.csv"), verbose);
+    copy_file("/ini/shell.sh", include_bytes!("../../dsk/ini/shell.sh"), verbose);
+    copy_file("/ini/version.txt", include_bytes!("../../dsk/ini/version.txt"), verbose);
 
     create_dir("/ini/lisp", verbose);
     copy_file("/ini/lisp/core.lsp", include_bytes!("../../dsk/ini/lisp/core.lsp"), verbose);
diff --git a/src/usr/lisp.rs b/src/usr/lisp.rs
index 78f6d85..be5630b 100644
--- a/src/usr/lisp.rs
+++ b/src/usr/lisp.rs
@@ -294,8 +294,7 @@ fn default_env() -> Rc<RefCell<Env>> {
     data.insert("system".to_string(), Exp::Func(|args: &[Exp]| -> Result<Exp, Err> {
         ensure_length_eq!(args, 1);
         let cmd = string(&args[0])?;
-        let mut env = usr::shell::default_env();
-        let res = usr::shell::exec(&cmd, &mut env);
+        let res = usr::shell::exec(&cmd);
         Ok(Exp::Num(res as u8 as f64))
     }));
     data.insert("print".to_string(), Exp::Func(|args: &[Exp]| -> Result<Exp, Err> {
@@ -673,7 +672,7 @@ fn repl(env: &mut Rc<RefCell<Env>>) -> usr::shell::ExitCode {
     prompt.completion.set(&lisp_completer);
 
     while let Some(line) = prompt.input(&prompt_string) {
-        if line == "(exit)" || line == "(quit)" {
+        if line == "(quit)" {
             break;
         }
         if line.is_empty() {
diff --git a/src/usr/shell.rs b/src/usr/shell.rs
index cd1a2d4..f0a4e52 100644
--- a/src/usr/shell.rs
+++ b/src/usr/shell.rs
@@ -14,13 +14,13 @@ use alloc::string::{String, ToString};
 // TODO: Scan /bin
 const AUTOCOMPLETE_COMMANDS: [&str; 35] = [
     "2048", "base64", "calc", "colors", "copy", "date", "delete", "dhcp", "disk", "edit",
-    "env", "exit", "geotime", "goto", "help", "hex", "host", "http", "httpd", "install",
-    "keyboard", "lisp", "list", "memory", "move", "net", "pci", "read",
+    "env", "geotime", "goto", "help", "hex", "host", "http", "httpd", "install",
+    "keyboard", "lisp", "list", "memory", "move", "net", "pci", "quit", "read",
     "shell", "socket", "tcp", "time", "user", "vga", "write"
 ];
 
 #[repr(u8)]
-#[derive(PartialEq)]
+#[derive(PartialEq, Eq)]
 pub enum ExitCode {
     CommandSuccessful = 0,
     CommandUnknown    = 1,
@@ -28,6 +28,23 @@ pub enum ExitCode {
     ShellExit         = 255,
 }
 
+struct Config {
+    env: BTreeMap<String, String>,
+    aliases: BTreeMap<String, String>,
+}
+
+impl Config {
+    fn new() -> Config {
+        let aliases = BTreeMap::new();
+        let mut env = BTreeMap::new();
+        for (key, val) in sys::process::envs() {
+            env.insert(key, val); // Copy the process environment to the shell environment
+        }
+        env.insert("DIR".to_string(), sys::process::dir());
+        Config { env, aliases }
+    }
+}
+
 fn autocomplete_commands() -> Vec<String> {
     let mut res = Vec::new();
     for cmd in AUTOCOMPLETE_COMMANDS {
@@ -38,7 +55,6 @@ fn autocomplete_commands() -> Vec<String> {
             res.push(file.name());
         }
     }
-    res.sort();
     res
 }
 
@@ -69,6 +85,7 @@ fn shell_completer(line: &str) -> Vec<String> {
             }
         }
     }
+    entries.sort();
     entries
 }
 
@@ -79,19 +96,6 @@ pub fn prompt_string(success: bool) -> String {
     format!("{}>{} ", if success { csi_color } else { csi_error }, csi_reset)
 }
 
-pub fn default_env() -> BTreeMap<String, String> {
-    let mut env = BTreeMap::new();
-
-    // Copy the process environment to the shell environment
-    for (key, val) in sys::process::envs() {
-        env.insert(key, val);
-    }
-
-    env.insert("DIR".to_string(), sys::process::dir());
-
-    env
-}
-
 fn is_globbing(arg: &str) -> bool {
     let arg: Vec<char> = arg.chars().collect();
     let n = arg.len();
@@ -124,10 +128,10 @@ fn glob_to_regex(pattern: &str) -> String {
 fn glob(arg: &str) -> Vec<String> {
     let mut matches = Vec::new();
     if is_globbing(arg) {
-        let (dir, pattern) = if arg.contains("/") {
-            (fs::dirname(&arg).to_string(), fs::filename(&arg).to_string())
+        let (dir, pattern) = if arg.contains('/') {
+            (fs::dirname(arg).to_string(), fs::filename(arg).to_string())
         } else {
-            (sys::process::dir().clone(), arg.to_string())
+            (sys::process::dir(), arg.to_string())
         };
 
         let re = Regex::new(&glob_to_regex(&pattern));
@@ -192,7 +196,7 @@ pub fn split_args(cmd: &str) -> Vec<String> {
     args
 }
 
-fn proc(args: &[&str]) -> ExitCode {
+fn cmd_proc(args: &[&str]) -> ExitCode {
     match args.len() {
         1 => {
             ExitCode::CommandSuccessful
@@ -222,7 +226,7 @@ fn proc(args: &[&str]) -> ExitCode {
     }
 }
 
-fn change_dir(args: &[&str], env: &mut BTreeMap<String, String>) -> ExitCode {
+fn cmd_change_dir(args: &[&str], config: &mut Config) -> ExitCode {
     match args.len() {
         1 => {
             println!("{}", sys::process::dir());
@@ -235,7 +239,7 @@ fn change_dir(args: &[&str], env: &mut BTreeMap<String, String>) -> ExitCode {
             }
             if api::fs::is_dir(&pathname) {
                 sys::process::set_dir(&pathname);
-                env.insert("DIR".to_string(), sys::process::dir());
+                config.env.insert("DIR".to_string(), sys::process::dir());
                 ExitCode::CommandSuccessful
             } else {
                 error!("File not found '{}'", pathname);
@@ -248,27 +252,86 @@ fn change_dir(args: &[&str], env: &mut BTreeMap<String, String>) -> ExitCode {
     }
 }
 
-pub fn exec(cmd: &str, env: &mut BTreeMap<String, String>) -> ExitCode {
+fn cmd_alias(args: &[&str], config: &mut Config) -> ExitCode {
+    if args.len() != 3 {
+        let csi_option = Style::color("LightCyan");
+        let csi_title = Style::color("Yellow");
+        let csi_reset = Style::reset();
+        println!("{}Usage:{} alias {}<key> <val>{1}", csi_title, csi_reset, csi_option);
+        return usr::shell::ExitCode::CommandError;
+    }
+    config.aliases.insert(args[1].to_string(), args[2].to_string());
+    ExitCode::CommandSuccessful
+}
+
+fn cmd_unalias(args: &[&str], config: &mut Config) -> ExitCode {
+    if args.len() != 2 {
+        let csi_option = Style::color("LightCyan");
+        let csi_title = Style::color("Yellow");
+        let csi_reset = Style::reset();
+        println!("{}Usage:{} unalias {}<key>{1}", csi_title, csi_reset, csi_option);
+        return usr::shell::ExitCode::CommandError;
+    }
+
+    if config.aliases.remove(&args[1].to_string()).is_none() {
+        error!("Error: could not unalias '{}'", args[1]);
+        return usr::shell::ExitCode::CommandError;
+    }
+
+    ExitCode::CommandSuccessful
+}
+
+fn cmd_set(args: &[&str], config: &mut Config) -> ExitCode {
+    if args.len() != 3 {
+        let csi_option = Style::color("LightCyan");
+        let csi_title = Style::color("Yellow");
+        let csi_reset = Style::reset();
+        println!("{}Usage:{} set {}<key> <val>{1}", csi_title, csi_reset, csi_option);
+        return usr::shell::ExitCode::CommandError;
+    }
+
+    config.env.insert(args[1].to_string(), args[2].to_string());
+    ExitCode::CommandSuccessful
+}
+
+fn cmd_unset(args: &[&str], config: &mut Config) -> ExitCode {
+    if args.len() != 2 {
+        let csi_option = Style::color("LightCyan");
+        let csi_title = Style::color("Yellow");
+        let csi_reset = Style::reset();
+        println!("{}Usage:{} unset {}<key>{1}", csi_title, csi_reset, csi_option);
+        return usr::shell::ExitCode::CommandError;
+    }
+
+    if config.env.remove(&args[1].to_string()).is_none() {
+        error!("Error: could not unset '{}'", args[1]);
+        return usr::shell::ExitCode::CommandError;
+    }
+
+    ExitCode::CommandSuccessful
+}
+
+fn exec_with_config(cmd: &str, config: &mut Config) -> ExitCode {
     let mut cmd = cmd.to_string();
 
     // Replace `$key` with its value in the environment or an empty string
     let re = Regex::new("\\$\\w+");
     while let Some((a, b)) = re.find(&cmd) {
         let key: String = cmd.chars().skip(a + 1).take(b - a - 1).collect();
-        let val = env.get(&key).map_or("", String::as_str);
-        cmd = cmd.replace(&format!("${}", key), &val);
+        let val = config.env.get(&key).map_or("", String::as_str);
+        cmd = cmd.replace(&format!("${}", key), val);
     }
 
-    // Set env var like `foo=42` or `bar = "Hello, World!"
-    if Regex::new("^\\w+ *= *\\S*$").is_match(&cmd) {
-        let mut iter = cmd.splitn(2, '=');
-        let key = iter.next().unwrap_or("").trim().to_string();
-        let val = iter.next().unwrap_or("").trim().to_string();
-        env.insert(key, val);
-        return ExitCode::CommandSuccessful
+    let mut args = split_args(&cmd);
+
+    // Replace command alias
+    if let Some(alias) = config.aliases.get(&args[0]) {
+        args.remove(0);
+        for arg in alias.split(' ').rev() {
+            args.insert(0, arg.to_string())
+        }
     }
 
-    let args = split_args(&cmd);
     let mut args: Vec<&str> = args.iter().map(String::as_str).collect();
 
     // Redirections like `print hello => /tmp/hello`
@@ -326,62 +389,52 @@ pub fn exec(cmd: &str, env: &mut BTreeMap<String, String>) -> ExitCode {
     }
 
     let res = match args[0] {
-        ""                     => ExitCode::CommandSuccessful,
-        "a"                    => ExitCode::CommandUnknown,
-        "b"                    => ExitCode::CommandUnknown,
-        "c" | "copy"           => usr::copy::main(&args),
-        "d" | "del" | "delete" => usr::delete::main(&args),
-        "e" | "edit"           => usr::editor::main(&args),
-        "f" | "find"           => usr::find::main(&args),
-        "g" | "go" | "goto"    => change_dir(&args, env),
-        "h" | "help"           => usr::help::main(&args),
-        "i"                    => ExitCode::CommandUnknown,
-        "j"                    => ExitCode::CommandUnknown,
-        "k"                    => ExitCode::CommandUnknown,
-        "l" | "list"           => usr::list::main(&args),
-        "m" | "move"           => usr::r#move::main(&args),
-        "n"                    => ExitCode::CommandUnknown,
-        "o"                    => ExitCode::CommandUnknown,
-        "q" | "quit" | "exit"  => ExitCode::ShellExit,
-        "r" | "read"           => usr::read::main(&args),
-        "s"                    => ExitCode::CommandUnknown,
-        "t"                    => ExitCode::CommandUnknown,
-        "u"                    => ExitCode::CommandUnknown,
-        "v"                    => ExitCode::CommandUnknown,
-        "w" | "write"          => usr::write::main(&args),
-        "x"                    => ExitCode::CommandUnknown,
-        "y"                    => ExitCode::CommandUnknown,
-        "z"                    => ExitCode::CommandUnknown,
-        "vga"                  => usr::vga::main(&args),
-        "sh" | "shell"         => usr::shell::main(&args),
-        "calc"                 => usr::calc::main(&args),
-        "base64"               => usr::base64::main(&args),
-        "date"                 => usr::date::main(&args),
-        "env"                  => usr::env::main(&args),
-        "hex"                  => usr::hex::main(&args),
-        "net"                  => usr::net::main(&args),
-        "dhcp"                 => usr::dhcp::main(&args),
-        "http"                 => usr::http::main(&args),
-        "httpd"                => usr::httpd::main(&args),
-        "socket"               => usr::socket::main(&args),
-        "tcp"                  => usr::tcp::main(&args),
-        "host"                 => usr::host::main(&args),
-        "install"              => usr::install::main(&args),
-        "geotime"              => usr::geotime::main(&args),
-        "colors"               => usr::colors::main(&args),
-        "dsk" | "disk"         => usr::disk::main(&args),
-        "user"                 => usr::user::main(&args),
-        "mem" | "memory"       => usr::memory::main(&args),
-        "kb" | "keyboard"      => usr::keyboard::main(&args),
-        "lisp"                 => usr::lisp::main(&args),
-        "chess"                => usr::chess::main(&args),
-        "beep"                 => usr::beep::main(&args),
-        "elf"                  => usr::elf::main(&args),
-        "pci"                  => usr::pci::main(&args),
-        "2048"                 => usr::pow::main(&args),
-        "time"                 => usr::time::main(&args),
-        "proc"                 => proc(&args),
-        _                      => {
+        ""         => ExitCode::CommandSuccessful,
+        "2048"     => usr::pow::main(&args),
+        "alias"    => cmd_alias(&args, config),
+        "base64"   => usr::base64::main(&args),
+        "beep"     => usr::beep::main(&args),
+        "calc"     => usr::calc::main(&args),
+        "chess"    => usr::chess::main(&args),
+        "colors"   => usr::colors::main(&args),
+        "copy"     => usr::copy::main(&args),
+        "date"     => usr::date::main(&args),
+        "delete"   => usr::delete::main(&args),
+        "dhcp"     => usr::dhcp::main(&args),
+        "disk"     => usr::disk::main(&args),
+        "edit"     => usr::editor::main(&args),
+        "elf"      => usr::elf::main(&args),
+        "env"      => usr::env::main(&args),
+        "find"     => usr::find::main(&args),
+        "geotime"  => usr::geotime::main(&args),
+        "goto"     => cmd_change_dir(&args, config),
+        "help"     => usr::help::main(&args),
+        "hex"      => usr::hex::main(&args),
+        "host"     => usr::host::main(&args),
+        "http"     => usr::http::main(&args),
+        "httpd"    => usr::httpd::main(&args),
+        "install"  => usr::install::main(&args),
+        "keyboard" => usr::keyboard::main(&args),
+        "lisp"     => usr::lisp::main(&args),
+        "list"     => usr::list::main(&args),
+        "memory"   => usr::memory::main(&args),
+        "move"     => usr::r#move::main(&args),
+        "net"      => usr::net::main(&args),
+        "pci"      => usr::pci::main(&args),
+        "proc"     => cmd_proc(&args),
+        "quit"     => ExitCode::ShellExit,
+        "read"     => usr::read::main(&args),
+        "set"      => cmd_set(&args, config),
+        "shell"    => usr::shell::main(&args),
+        "socket"   => usr::socket::main(&args),
+        "tcp"      => usr::tcp::main(&args),
+        "time"     => usr::time::main(&args),
+        "unalias"  => cmd_unalias(&args, config),
+        "unset"    => cmd_unset(&args, config),
+        "user"     => usr::user::main(&args),
+        "vga"      => usr::vga::main(&args),
+        "write"    => usr::write::main(&args),
+        _          => {
             let mut path = fs::realpath(args[0]);
             if path.len() > 1 {
                 path = path.trim_end_matches('/').into();
@@ -389,7 +442,7 @@ pub fn exec(cmd: &str, env: &mut BTreeMap<String, String>) -> ExitCode {
             match syscall::info(&path).map(|info| info.kind()) {
                 Some(FileType::Dir) => {
                     sys::process::set_dir(&path);
-                    env.insert("DIR".to_string(), sys::process::dir());
+                    config.env.insert("DIR".to_string(), sys::process::dir());
                     ExitCode::CommandSuccessful
                 }
                 Some(FileType::File) => {
@@ -402,12 +455,7 @@ pub fn exec(cmd: &str, env: &mut BTreeMap<String, String>) -> ExitCode {
                     }
                 }
                 _ => {
-                    // TODO: add aliases command instead of hardcoding them
-                    let name = match args[0] {
-                        "p" => "print",
-                        arg => arg,
-                    };
-                    if api::process::spawn(&format!("/bin/{}", name), &args).is_ok() {
+                    if api::process::spawn(&format!("/bin/{}", args[0]), &args).is_ok() {
                         ExitCode::CommandSuccessful
                     } else {
                         error!("Could not execute '{}'", cmd);
@@ -428,7 +476,7 @@ pub fn exec(cmd: &str, env: &mut BTreeMap<String, String>) -> ExitCode {
     res
 }
 
-fn repl(env: &mut BTreeMap<String, String>) -> usr::shell::ExitCode {
+fn repl(config: &mut Config) -> usr::shell::ExitCode {
     println!();
 
     let mut prompt = Prompt::new();
@@ -438,7 +486,7 @@ fn repl(env: &mut BTreeMap<String, String>) -> usr::shell::ExitCode {
 
     let mut success = true;
     while let Some(cmd) = prompt.input(&prompt_string(success)) {
-        match exec(&cmd, env) {
+        match exec_with_config(&cmd, config) {
             ExitCode::CommandSuccessful => {
                 success = true;
             },
@@ -458,26 +506,37 @@ fn repl(env: &mut BTreeMap<String, String>) -> usr::shell::ExitCode {
     ExitCode::CommandSuccessful
 }
 
+pub fn exec(cmd: &str) -> ExitCode {
+    let mut config = Config::new();
+    exec_with_config(cmd, &mut config)
+}
+
 pub fn main(args: &[&str]) -> ExitCode {
-    let mut env = default_env();
+    let mut config = Config::new();
+
+    if let Ok(rc) = fs::read_to_string("/ini/shell.sh") {
+        for cmd in rc.split('\n') {
+            exec_with_config(cmd, &mut config);
+        }
+    }
 
     if args.len() < 2 {
-        env.insert(0.to_string(), args[0].to_string());
+        config.env.insert(0.to_string(), args[0].to_string());
 
-        repl(&mut env)
+        repl(&mut config)
     } else {
-        env.insert(0.to_string(), args[1].to_string());
+        config.env.insert(0.to_string(), args[1].to_string());
 
         // Add script arguments to the environment as `$1`, `$2`, `$3`, ...
         for (i, arg) in args[2..].iter().enumerate() {
-            env.insert((i + 1).to_string(), arg.to_string());
+            config.env.insert((i + 1).to_string(), arg.to_string());
         }
 
         let pathname = args[1];
         if let Ok(contents) = api::fs::read_to_string(pathname) {
             for line in contents.split('\n') {
                 if !line.is_empty() {
-                    exec(line, &mut env);
+                    exec_with_config(line, &mut config);
                 }
             }
             ExitCode::CommandSuccessful
@@ -496,26 +555,25 @@ fn test_shell() {
     sys::fs::format_mem();
     usr::install::copy_files(false);
 
-    let mut env = default_env();
-
     // Redirect standard output
-    exec("print test1 => /test", &mut env);
+    exec("print test1 => /test");
     assert_eq!(api::fs::read_to_string("/test"), Ok("test1\n".to_string()));
 
     // Overwrite content of existing file
-    exec("print test2 => /test", &mut env);
+    exec("print test2 => /test");
     assert_eq!(api::fs::read_to_string("/test"), Ok("test2\n".to_string()));
 
     // Redirect standard output explicitely
-    exec("print test3 1=> /test", &mut env);
+    exec("print test3 1=> /test");
     assert_eq!(api::fs::read_to_string("/test"), Ok("test3\n".to_string()));
 
     // Redirect standard error explicitely
-    exec("hex /nope 2=> /test", &mut env);
+    exec("hex /nope 2=> /test");
     assert!(api::fs::read_to_string("/test").unwrap().contains("File not found '/nope'"));
 
-    exec("b = 42", &mut env);
-    exec("print a $b $c d => /test", &mut env);
+    let mut config = Config::new();
+    exec_with_config("set b 42", &mut config);
+    exec_with_config("print a $b $c d => /test", &mut config);
     assert_eq!(api::fs::read_to_string("/test"), Ok("a 42 d\n".to_string()));
 
     sys::fs::dismount();
diff --git a/src/usr/time.rs b/src/usr/time.rs
index 8d57b74..d014d0b 100644
--- a/src/usr/time.rs
+++ b/src/usr/time.rs
@@ -6,9 +6,8 @@ pub fn main(args: &[&str]) -> usr::shell::ExitCode {
     let csi_color = Style::color("LightBlue");
     let csi_reset = Style::reset();
     let cmd = args[1..].join(" ");
-    let mut env = usr::shell::default_env();
     let start = clock::realtime();
-    usr::shell::exec(&cmd, &mut env);
+    usr::shell::exec(&cmd);
     let duration = clock::realtime() - start;
     println!("{}Executed '{}' in {:.6}s{}", csi_color, cmd, duration, csi_reset);
     usr::shell::ExitCode::CommandSuccessful