diff --git a/Cargo.lock b/Cargo.lock
index 82e2a58061..410787f082 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -158,7 +158,7 @@ dependencies = [
 [[package]]
 name = "redox_users"
 version = "0.1.0"
-source = "git+https://github.com/redox-os/users.git#70b8a69ce6588693d05f3500b481c2620c1ee824"
+source = "git+https://github.com/redox-os/users.git#0fc602398887533c947b3f428e9fe0037f829478"
 dependencies = [
  "argon2rs 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "extra 0.1.0 (git+https://github.com/redox-os/libextra.git)",
diff --git a/Cargo.toml b/Cargo.toml
index 3d48fc87f6..e3db1c22aa 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,14 @@ path = "src/bin/getty.rs"
 name = "groupadd"
 path = "src/bin/groupadd.rs"
 
+[[bin]]
+name = "groupdel"
+path = "src/bin/groupdel.rs"
+
+[[bin]]
+name = "groupmod"
+path = "src/bin/groupmod.rs"
+
 [[bin]]
 name = "login"
 path = "src/bin/login.rs"
@@ -34,6 +42,14 @@ path = "src/bin/sudo.rs"
 name = "useradd"
 path = "src/bin/useradd.rs"
 
+[[bin]]
+name = "userdel"
+path = "src/bin/userdel.rs"
+
+[[bin]]
+name = "usermod"
+path = "src/bin/usermod.rs"
+
 [[bin]]
 name = "whoami"
 path = "src/bin/whoami.rs"
diff --git a/src/bin/groupdel.rs b/src/bin/groupdel.rs
new file mode 100644
index 0000000000..01bfcb27aa
--- /dev/null
+++ b/src/bin/groupdel.rs
@@ -0,0 +1,64 @@
+#[deny(warnings)]
+
+extern crate arg_parser;
+extern crate extra;
+extern crate redox_users;
+
+use std::env;
+use std::io::{stdout, Write};
+use std::process::exit;
+
+use arg_parser::ArgParser;
+use extra::option::OptionalExt;
+use redox_users::AllGroups;
+
+const MAN_PAGE: &'static str =  /* @MANSTART{groupdel} */ r#"
+NAME
+    groupdel - modify system files to delete groups
+
+SYNOPSYS
+    groupdel [ options ] LOGIN
+    groupdel [ -h | --help ]
+
+DESCRIPTION
+    groupdel removes groups from whatever backend is employed by
+    the system's redox_users.
+
+    Note that you should not remove a primary user group before
+    removing the user. It is also generally wise not to remove
+    groups that still own files on the system.
+
+OPTIONS
+    -h, --help
+        Print this help page and exit.
+
+AUTHORS
+    Wesley Hershberger.
+"#; /* @MANEND */
+
+fn main() {
+    let mut stdout = stdout();
+    
+    let mut parser = ArgParser::new(9)
+        .add_flag(&["h", "help"]);
+    parser.parse(env::args());
+    
+    if parser.found("help") {
+        stdout.write_all(MAN_PAGE.as_bytes()).unwrap();
+        stdout.flush().unwrap();
+        exit(0);
+    }
+    
+    let group = if parser.args.is_empty() {
+        eprintln!("groupdel: no login specified");
+        exit(1);
+    } else {
+        &parser.args[0]
+    };
+    
+    let mut sys_groups = AllGroups::new().unwrap_or_exit(1);
+    
+    sys_groups.remove_by_name(group.to_string()).unwrap_or_exit(1);
+    
+    sys_groups.save().unwrap_or_exit(1);
+}
diff --git a/src/bin/groupmod.rs b/src/bin/groupmod.rs
new file mode 100644
index 0000000000..ad8590b0b1
--- /dev/null
+++ b/src/bin/groupmod.rs
@@ -0,0 +1,94 @@
+#[deny(warnings)]
+
+extern crate arg_parser;
+extern crate extra;
+extern crate redox_users;
+
+use std::env;
+use std::io::{stdout, Write};
+use std::process::exit;
+
+use arg_parser::ArgParser;
+use extra::option::OptionalExt;
+use redox_users::AllGroups;
+
+const MAN_PAGE: &'static str =  /* @MANSTART{groupmod} */ r#"
+NAME
+    groupmod - modify group information
+
+SYNOPSYS
+    groupmod [ options ] GROUP
+    groupmod [ -h | --help ]
+
+DESCRIPTION
+    groupmod modifies a user group GROUP in the system's
+    redox_users backend.
+
+OPTIONS
+    -h, --help
+        Print this help page and exit.
+
+    -g, --gid GID
+        Change GROUP's group id. GID must be a non-negative
+        decimal integer.
+        
+        Files with GROUP's old gid will not be updated.
+        
+        User's who use the old gid as their primary gid will
+        also not be updated. This is a TODO and will change.
+    
+    -n, --name NAME
+        The name of the group will be set to NAME
+
+AUTHORS
+    Wesley Hershberger.
+"#; /* @MANEND */
+
+fn main() {
+    let mut stdout = stdout();
+    
+    let mut parser = ArgParser::new(9)
+        .add_flag(&["h", "help"])
+        .add_opt("g", "gid")
+        .add_opt("n", "name");
+    parser.parse(env::args());
+    
+    if parser.found("help") {
+        stdout.write_all(MAN_PAGE.as_bytes()).unwrap();
+        stdout.flush().unwrap();
+        exit(0);
+    }
+    
+    let groupname = if parser.args.is_empty() {
+        eprintln!("groupmod: no login specified");
+        exit(1);
+    } else {
+        &parser.args[0]
+    };
+    
+    let mut sys_groups = AllGroups::new().unwrap_or_exit(1);
+    {
+        let group = sys_groups.get_mut_by_name(groupname).unwrap_or_else(|| {
+            eprintln!("groupmod: group does not exist: {}", groupname);
+            exit(1);
+        });
+        
+        //TODO: Update user's primary GID, if gid is used as such
+        if let Some(gid) = parser.get_opt("gid") {
+            let gid = gid.parse::<usize>().unwrap_or_exit(1);
+            group.gid = gid;
+        } else if parser.found("gid") {
+            eprintln!("groupmod: no gid found");
+            exit(1);
+        }
+        
+        if let Some(name) = parser.get_opt("name") {
+            group.group = name;
+        } else if parser.found("name") {
+            eprintln!("groupmod: no name found");
+            exit(1);
+        }
+    }
+    
+    sys_groups.save().unwrap_or_exit(1);
+}
diff --git a/src/bin/passwd.rs b/src/bin/passwd.rs
index 58b311ad3f..3316fbd678 100644
--- a/src/bin/passwd.rs
+++ b/src/bin/passwd.rs
@@ -29,10 +29,15 @@ DESCRIPTION
 
 OPTIONS
 
-    -h
-    --help
+    -h, --help
         Display this help and exit.
 
+    -l, --lock
+        Lock the password of the named account. This changes the stored password
+        hash so that it matches no encrypted value ("!")
+        
+        Users with locked passwords are not allowed to change their password.
+
 AUTHOR
     Written by Jeremy Soller, Jose Narvaez.
 "#; /* @MANEND */
@@ -60,13 +65,21 @@ fn main() {
     
     {
         let user = if parser.args.is_empty() {
-            users.get_mut_by_id(uid).unwrap_or_exit(1)
+            users.get_mut_by_id(uid).unwrap_or_else(|| {
+                eprintln!("passwd: you do not exist");
+                exit(1);
+            })
         } else {
             let username = &parser.args[0];
-            users.get_mut_by_name(username).unwrap_or_exit(1)
+            users.get_mut_by_name(username).unwrap_or_else(|| {
+                eprintln!("passwd: user does not exist: {}", username);
+                exit(1);
+            })
         };
-
-        if user.uid == uid || uid == 0 {
+        
+        if parser.found("lock") {
+            user.unset_passwd();
+        } else if user.uid == uid || uid == 0 {
             let msg = format!("changing password for '{}' \n", user.user);
             stdout.write_all(&msg.as_bytes()).try(&mut stderr);
             stdout.flush().try(&mut stderr);
@@ -74,6 +87,8 @@ fn main() {
             let mut verified = false;
             if user.is_passwd_blank() {
                 verified = true;
+            } else if user.is_passwd_unset() {
+                verified = false;
             } else if user.uid == uid || uid != 0 {
                 stdout.write_all(b"current password: ").try(&mut stderr);
                 stdout.flush().try(&mut stderr);
diff --git a/src/bin/useradd.rs b/src/bin/useradd.rs
index f5a9f9d575..1a8301c829 100644
--- a/src/bin/useradd.rs
+++ b/src/bin/useradd.rs
@@ -4,6 +4,7 @@ extern crate arg_parser;
 extern crate extra;
 extern crate syscall;
 extern crate redox_users;
+extern crate userutils;
 
 use std::{env, io};
 use std::io::Write;
@@ -11,9 +12,8 @@ use std::process::exit;
 
 use arg_parser::ArgParser;
 use extra::option::OptionalExt;
-use syscall::call::{open, fchmod, fchown};
-use syscall::flag::{O_CREAT, O_DIRECTORY, O_CLOEXEC};
 use redox_users::{AllGroups, AllUsers};
+use userutils::create_user_dir;
 
 const MAN_PAGE: &'static str = /* @MANSTART{useradd} */ r#"
 NAME
@@ -40,15 +40,16 @@ OPTIONS
 
     -c, --comment
         Any text string, usually used as the user's full name.
+        Historically known as the GECOS field
 
     -d, --home-dir HOME_DIR
         The new user will be created with HOME_DIR as their home
-        directory. The default value is LOGIN prepended with "/home".
-        This flag DOES NOT create the home directory. See --create-home.
+        directory. The default value is LOGIN prepended with "/home/".
+        This flag DOES NOT create the home directory. See --create-home
 
     -g, --gid GID
-        The group id to use for the default login group. This value must
-        not be in use and must be non-negative. The default is to pick the
+        The group id to use when creating the default login group. This value
+        must not be in use and must be non-negative. The default is to pick the
         smallest available group id between values defined in redox_users.
 
     -m, --create-home
@@ -56,14 +57,14 @@ OPTIONS
         
         This option is not enabled by default. This option must be specified
         for a home directory to be created. If not set, the user's home dir is
-        set to "/".
+        set to "/"
 
     -N, --no-user-group
         Do not attempt to create the user's user group. Instead, the groupid
-        is set to 99 (should be the "nobody" group).
+        is set to 99 ("nobody"). -N and -g are mutually exclusive.
 
     -s, --shell SHELL
-        The path to the user's default login shell. If left blank, the
+        The path to the user's default login shell. If not specified, the
         default shell is set as "/bin/ion"
 
     -u, --uid UID
@@ -76,7 +77,6 @@ AUTHORS
 "#; /* @MANEND */
 const DEFAULT_SHELL: &'static str = "/bin/ion";
 const DEFAULT_HOME: &'static str = "/home";
-const DEFAULT_MODE: u16 = 0o700;
 
 fn main() {
     let mut stdout = io::stdout();
@@ -106,11 +106,18 @@ fn main() {
     };
     
     let mut sys_users = AllUsers::new().unwrap_or_exit(1);
-    let mut sys_groups = AllGroups::new().unwrap_or_exit(1);
+    let mut sys_groups;
     
     let uid = if parser.found("uid") {
         match parser.get_opt("uid") {
-            Some(uid) => uid.parse::<usize>().unwrap_or_exit(1),
+            Some(uid) => {
+                let id = uid.parse::<usize>().unwrap_or_exit(1);
+                if let Some(_user) = sys_users.get_by_id(id) {
+                    eprintln!("useradd: user already exists with uid: {}", id);
+                    exit(1);
+                }
+                id
+            },
             None => {
                 eprintln!("useradd: missing uid value");
                 exit(1);
@@ -129,12 +136,29 @@ fn main() {
     //This is a ridiculous mess and could use reworking
     let gid: usize;
     if parser.found("no-user-group") {
+        sys_groups = AllGroups::new().unwrap_or_exit(1);
         gid = 99;
-        //TODO: Add this user to the "nobody" group
+        {
+            let nobody = sys_groups.get_mut_by_name("nobody").unwrap_or_else(|| {
+                eprintln!("useradd: group \"nobody\" not found");
+                exit(1)
+            });
+            nobody.users.push(String::from(login.as_str()));
+        }
+        sys_groups.save().unwrap_or_exit(1);
     } else {
+        sys_groups = AllGroups::new().unwrap_or_exit(1);
+        
         if parser.found("gid") {
             gid = match parser.get_opt("gid") {
-                Some(gid) => gid.parse::<usize>().unwrap_or_exit(1),
+                Some(gid) => {
+                    let id = gid.parse::<usize>().unwrap_or_exit(1);
+                    if let Some(_group) = sys_groups.get_by_id(id) {
+                        eprintln!("useradd: group already exists with gid: {}", id);
+                        exit(1);
+                    }
+                    id
+                },
                 None => {
                     eprintln!("useradd: missing gid argument");
                     exit(1);
@@ -156,6 +180,7 @@ fn main() {
                 exit(1);
             }
         }
+        sys_groups.save().unwrap_or_exit(1);
     }
     
     let username = if parser.found("comment") {
@@ -204,15 +229,16 @@ fn main() {
         }
     }
     
+    println!("Got info: {};{};{};{};{};{}", login, uid, gid, username, userhome, shell);
+    
     // Make sure to try and create the user before we create
     // their home, that way we get a permissions error that makes
     // more sense
     sys_users.save().unwrap_or_exit(1);
-    sys_groups.save().unwrap_or_exit(1);
     
     if parser.found("create-home") {
-        let fd = open(userhome, O_CREAT | O_DIRECTORY | O_CLOEXEC).unwrap_or_exit(1);
-        fchmod(fd, DEFAULT_MODE).unwrap_or_exit(1);
-        fchown(fd, uid as u32, gid as u32).unwrap_or_exit(1);
+        //Shouldn't ever error...
+        let user = sys_users.get_by_id(uid).unwrap_or_exit(1);
+        create_user_dir(user, userhome).unwrap_or_exit(1);
     }
 }
diff --git a/src/bin/userdel.rs b/src/bin/userdel.rs
new file mode 100644
index 0000000000..5d11b25ccd
--- /dev/null
+++ b/src/bin/userdel.rs
@@ -0,0 +1,81 @@
+#[deny(warnings)]
+
+extern crate arg_parser;
+extern crate extra;
+extern crate redox_users;
+
+use std::env;
+use std::io::{stdout, Write};
+use std::fs::remove_dir;
+use std::process::exit;
+
+use arg_parser::ArgParser;
+use extra::option::OptionalExt;
+use redox_users::AllUsers;
+
+const MAN_PAGE: &'static str =  /* @MANSTART{userdel} */ r#"
+NAME
+    userdel - modify system files to delete users
+
+SYNOPSYS
+    userdel [ options ] LOGIN
+    userdel [ -h | --help ]
+
+DESCRIPTION
+    userdel removes users from whatever backend is employed by
+    the system's redox_users.
+    
+    It can also be used to manage removal of home directories.
+    
+    This utility does not remove the user from any groups! This is
+    a planned feature and will be implemented at some point.
+
+OPTIONS
+    -h, --help
+        Print this help page and exit.
+
+    -r, --remove
+        The user's home directory and all files inside will be
+        removed.
+
+AUTHORS
+    Wesley Hershberger.
+"#; /* @MANEND */
+
+fn main() {
+    let mut stdout = stdout();
+    
+    let mut parser = ArgParser::new(9)
+        .add_flag(&["h", "help"])
+        .add_flag(&["r", "remove"]);
+    parser.parse(env::args());
+    
+    if parser.found("help") {
+        stdout.write_all(MAN_PAGE.as_bytes()).unwrap();
+        stdout.flush().unwrap();
+        exit(0);
+    }
+    
+    let login = if parser.args.is_empty() {
+        eprintln!("userdel: no login specified");
+        exit(1);
+    } else {
+        &parser.args[0]
+    };
+    
+    let mut sys_users = AllUsers::new().unwrap_or_exit(1);
+    {
+        let user = sys_users.get_by_name(login).unwrap_or_else(|| {
+            eprintln!("userdel: user does not exist: {}", login);
+            exit(1);
+        });
+        
+        if parser.found("remove") {
+            remove_dir(&user.home).unwrap_or_exit(1);
+        }
+    }
+    
+    sys_users.remove_by_name(login.to_string()).unwrap_or_exit(1);
+    
+    sys_users.save().unwrap_or_exit(1);
+}
diff --git a/src/bin/usermod.rs b/src/bin/usermod.rs
new file mode 100644
index 0000000000..061c2502ed
--- /dev/null
+++ b/src/bin/usermod.rs
@@ -0,0 +1,206 @@
+#![deny(warnings)]
+
+extern crate arg_parser;
+extern crate extra;
+extern crate redox_users;
+extern crate userutils;
+
+use std::env;
+use std::io::{stdout, Write};
+use std::fs::{remove_dir, rename};
+use std::process::exit;
+
+use arg_parser::ArgParser;
+use extra::option::OptionalExt;
+use redox_users::{AllGroups, AllUsers};
+use userutils::create_user_dir;
+
+const MAN_PAGE: &'static str = /* @MANSTART{usermod} */ r#"
+NAME
+    usermod - modify user information
+
+SYNOPSYS
+    usermod [ options ] LOGIN
+    usermod [ -h | --help ]
+
+DESCRIPTION
+    The usermod utility can be used to modify user information.
+
+    This utility uses the redox_users API, so the backend is whatever
+    backend in use on the system for that API at the time.
+
+    See passwd for setting user passwords.
+
+OPTIONS
+    -h, --help
+        Display this help and exit.
+
+    -c, --comment COMMENT
+        The comment field (or GECOS, historically) for the user. This
+        is typically the full name of the user, although sometimes it
+        includes an e-mail.
+
+    -d, --home-dir HOME_DIR
+        Sets the home directory to HOME_DIR and creates the directory.
+        See -m for move
+
+    -m, --move-home
+        Moves the the user's old home directory into the home directory
+        specified by --home-dir. Has no effect if passed without --home-dir
+
+    -G, --append-groups GROUP[,GROUP, ...]
+        Add this user to GROUP groups. This does not remove the user from
+        any group of which they are already a member.
+
+    -S, --set-groups GROUP[,GROUP, ...]
+        Remove the user from all groups of which they are a part and add
+        them to GROUP groups.
+
+    -g, --gid GID
+        Set the user's primary group id. If the group does not exist,
+        a warning is issued and no changes are applied.
+
+    -l, --login NEW_LOGIN
+        Set the new login name for the user. Must not be in use.
+
+    -s, --shell SHELL
+        Set the user's login shell as SHELL. This must be a full path.
+
+    -u, --uid UID
+        Set the user's user id. If another user's userid is the same as
+        UID, a warning is issued and no changes are applied. Note that
+        changing the value of the user's userid may have unexpected consequences.
+
+AUTHORS
+    Written by Wesley Hershberger.
+"#; /* @MANEND */
+
+fn main() {
+    let mut stdout = stdout();
+    
+    let mut parser = ArgParser::new(9)
+        .add_flag(&["h", "help"])
+        .add_flag(&["m", "move-home"])
+        .add_opt("c", "comment")
+        .add_opt("d", "home-dir")
+        .add_opt("G", "groups")
+        .add_opt("g", "gid")
+        .add_opt("l", "login")
+        .add_opt("s", "shell")
+        .add_opt("u", "uid");
+    parser.parse(env::args());
+    
+    if parser.found("help") {
+        stdout.write_all(MAN_PAGE.as_bytes()).unwrap();
+        stdout.flush().unwrap();
+        exit(0);
+    }
+    
+    let login = if parser.args.is_empty() {
+        eprintln!("usermod: no login specified");
+        exit(1);
+    } else {
+        &parser.args[0]
+    };
+    
+    let mut sys_users = AllUsers::new().unwrap_or_exit(1);
+    let mut sys_groups;
+    
+    if parser.found("groups") {
+        sys_groups = AllGroups::new().unwrap_or_exit(1);
+        
+        let new_groups = parser.get_opt("groups").unwrap_or_else(|| {
+            eprintln!("usermod: no groups found");
+            exit(1);
+        });
+        let new_groups = new_groups.split(',');
+        
+        for groupname in new_groups {
+            let group = sys_groups.get_mut_by_name(groupname).unwrap_or_else(|| {
+                eprintln!("usermod: no group found: {}", groupname);
+                exit(1);
+            });
+            group.users.push(String::from(login.as_str()));
+        }
+        
+        sys_groups.save().unwrap_or_exit(1);
+    }
+    
+    // Nasty to satisfy borrow checker. See line ~174 too
+    let uid = if let Some(uid) = parser.get_opt("uid") {
+        let uid = uid.parse::<usize>().unwrap_or_exit(1);
+        if let Some(_user) = sys_users.get_by_id(uid) {
+            eprintln!("usermod: userid already in use: {}", uid);
+            exit(1);
+        } else {
+            Some(uid)
+        }
+    } else if parser.found("uid") {
+        eprintln!("usermod: no uid found");
+        exit(1);
+    } else {
+        None
+    };
+    
+    {
+        let user = sys_users.get_mut_by_name(&login).unwrap_or_else(|| {
+            eprintln!("usermod: user \"{}\" not found", login);
+            exit(1);
+        });
+        
+        if let Some(gecos) = parser.get_opt("comment") {
+            user.name = gecos;
+        // If we found it but ^that^ was None, problem
+        } else if parser.found("comment") {
+            eprintln!("usermod: no comment found");
+            exit(1);
+        }
+        
+        if let Some(new_login) = parser.get_opt("login") {
+            user.user = new_login;
+        } else if parser.found("login") {
+            eprintln!("usermod: no login found");
+            exit(1);
+        }
+        
+        if let Some(shell) = parser.get_opt("shell") {
+            user.shell = shell;
+        } else if parser.found("shell") {
+            eprintln!("usermod: no shell found");
+            exit(1);
+        }
+        
+        if let Some(home) = parser.get_opt("home-dir") {
+            if parser.found("move-home") {
+                rename(&user.home, &home).unwrap_or_exit(1);
+            } else {
+                create_user_dir(user, &home).unwrap_or_exit(1);
+                remove_dir(&user.home).unwrap_or_exit(1);
+            }
+            user.home = home;
+        } else if parser.found("home-dir") {
+            eprintln!("usermod: no home dir found");
+            exit(1);
+        }
+        
+        if let Some(uid) = uid {
+            user.uid = uid;
+        }
+        
+        if let Some(gid) = parser.get_opt("gid") {
+            sys_groups = AllGroups::new().unwrap_or_exit(1);
+            let gid = gid.parse::<usize>().unwrap_or_exit(1);
+            
+            if let Some(_group) = sys_groups.get_by_id(gid) {
+                user.gid = gid;
+            } else {
+                eprintln!("usermod: no group found for id: {}", gid);
+            }
+        } else if parser.found("gid") {
+            eprintln!("usermod: no gid found");
+            exit(1);
+        }
+    }
+    
+    sys_users.save().unwrap_or_exit(1);
+}
diff --git a/src/lib.rs b/src/lib.rs
index 95323ebf64..c7a7dd86fa 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -17,10 +17,16 @@
 //! - `whoami`: Display effective user ID.
 
 extern crate redox_users;
+extern crate syscall;
 
 use std::io::Result;
 
 use redox_users::User;
+use syscall::call::{open, fchmod, fchown};
+use syscall::error::Result as SysResult;
+use syscall::flag::{O_CREAT, O_DIRECTORY, O_CLOEXEC};
+
+const DEFAULT_MODE: u16 = 0o700;
 
 /// Spawns a shell for the given `User`.
 ///
@@ -46,3 +52,13 @@ pub fn spawn_shell(user: &User) -> Result<i32> {
         None => Ok(1)
     }
 }
+
+
+pub fn create_user_dir<T>(user: &User, dir: T) -> SysResult<()>
+    where T: AsRef<str> + std::convert::AsRef<[u8]>
+{
+    let fd = open(dir, O_CREAT | O_DIRECTORY | O_CLOEXEC)?;
+    fchmod(fd, DEFAULT_MODE)?;
+    fchown(fd, user.uid as u32, user.gid as u32)?;
+    Ok(())
+}