diff --git a/Cargo.lock b/Cargo.lock
index 575169a..b808d25 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,458 @@
 # It is not intended for manual editing.
 version = 3
 
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 [[package]]
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+ "windows_i686_gnu",
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+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
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diff --git a/Cargo.toml b/Cargo.toml
index 8779024..5e213e7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,8 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+clap = { version = "4.4.7", features = ["derive", "env"] }
+env_logger = "0.10.0"
+escape_string = "0.1.2"
+log = "0.4.20"
+rand = "0.8.5"
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..1232803 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,178 @@
-fn main() {
-    println!("Hello, world!");
+use std::fmt::{self, Formatter, Display};
+use std::fs;
+use std::io;
+use std::process;
+use std::iter;
+
+use rand::rngs::ThreadRng;
+use rand::{thread_rng, Rng};
+
+use clap::{Parser, ValueEnum};
+
+#[derive(Debug, Clone, ValueEnum)]
+enum CharacterSet {
+    Alphabetic,
+    Alphanumeric,
+    Hexadecimal,
+    Decimal,
+    Base64,
+}
+
+impl CharacterSet {
+    fn charset(&self) -> Vec<char> {
+        match self {
+            Self::Alphabetic => ('A'..='Z').chain('a'..='z').collect(),
+            Self::Alphanumeric => ('0'..='9').chain('A'..='Z').chain('a'..='z').collect(),
+            Self::Hexadecimal => ('0'..='9').chain('a'..='f').collect(),
+            Self::Decimal => ('0'..='9').collect(),
+            Self::Base64 => ('0'..='9').chain('A'..='Z').chain('a'..='z').chain(vec!['+', '/', '=']).collect(),
+        }
+    }
+
+    fn non_matching_characters(&self, string: &str) -> Vec<char> {
+        let charset = self.charset();
+
+        string.chars().filter(|input_character| !charset.contains(input_character)).collect()
+    }
+
+    fn generate(&self, length: usize, rng: &mut ThreadRng) -> String {
+        let charset = self.charset();
+
+        iter::repeat_with(|| charset[rng.gen_range(0..charset.len())]).take(length).collect()
+    }
+}
+
+impl Display for CharacterSet {
+    fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Alphabetic => write!(formatter, "Alphabetic [A-Za-z]"),
+            Self::Alphanumeric => write!(formatter, "Alphanumeric [0-9A-Za-z]"),
+            Self::Hexadecimal => write!(formatter, "Hexadecimal [0-9a-f]"),
+            Self::Decimal => write!(formatter, "Decimal [0-9]"),
+            Self::Base64 => write!(formatter, "Base64 [0-9A-Za-z+/=]"),
+        }
+    }
+}
+
+#[derive(Debug, Clone, ValueEnum)]
+enum BranchType {
+    Exit,
+    Error,
+    Override,
+}
+
+impl Display for BranchType {
+    fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Exit => write!(formatter, "Exit"),
+            Self::Error => write!(formatter, "Error"),
+            Self::Override => write!(formatter, "Override"),
+        }
+    }
+}
+
+/// Generate random strings and put them in a file
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None)]
+struct Arguments {
+    /// An optional path write generated output to
+    path: Option<String>,
+
+    /// The number of characters to generate (not bytes)
+    #[arg(long, env)]
+    length: usize,
+
+    /// The character set to use when generating
+    #[arg(long, env)]
+    character_set: CharacterSet,
+
+    /// What to do when a file already exists at the given path
+    #[arg(long, env, default_value = "error")]
+    when_file_exists: BranchType,
+
+    /// What to do when the content of a file at the given path does not match the character set or length
+    #[arg(long, env, default_value = "error")]
+    when_file_content_does_not_match: BranchType,
+}
+
+fn main() -> io::Result<()> {
+    env_logger::init_from_env(env_logger::Env::default().filter_or(env_logger::DEFAULT_FILTER_ENV, "debug"));
+
+    let arguments = Arguments::parse();
+    let path = arguments.path;
+    let character_set = arguments.character_set;
+    let length = arguments.length;
+
+    let exists = if path.is_none() {
+        log::debug!("No file path has been provided, printing to stdout.");
+
+        false
+    } else {
+        match fs::metadata(path.clone().unwrap()) {
+            Ok(_) => Ok(true),
+            Err(error) if error.kind() == io::ErrorKind::NotFound => Ok(false),
+            Err(error) => Err(error),
+        }?
+    };
+
+    if exists {
+        match arguments.when_file_exists {
+            BranchType::Exit => {
+                log::info!("File exists, exiting.");
+                process::exit(0);
+            },
+            BranchType::Error => {
+                log::error!("File exists, exiting.");
+                process::exit(1);
+            }
+            BranchType::Override => (),
+        };
+
+        let content = fs::read_to_string(path.clone().unwrap())?;
+
+        let non_matching_characters = character_set.non_matching_characters(&content);
+        let content_length = content.len();
+
+        if non_matching_characters.is_empty() && content_length == length {
+            log::debug!("File exists, matches character set and length, exiting.");
+
+            return Ok(());
+        } else {
+            let found_non_matching = non_matching_characters.iter().take(5).collect::<String>();
+            let found_non_matching = escape_string::escape(found_non_matching.as_str());
+            let found_non_matching = if non_matching_characters.len() > 5 {
+                found_non_matching + "..."
+            } else {
+                found_non_matching
+            };
+
+            match arguments.when_file_content_does_not_match {
+                BranchType::Exit => {
+                    log::info!("File exists, does not match character set (found [{}]) or length (found {}), exiting.", found_non_matching, content_length);
+                    process::exit(0);
+                },
+                BranchType::Error => {
+                    log::error!("File exists, does not match character set (found [{}]) or length (found {}), exiting.", found_non_matching, content_length);
+                    process::exit(1);
+                },
+                BranchType::Override => {
+                    log::debug!("File exists, does not match character set (found [{}]) or length (found {}).", found_non_matching, content_length);
+                },
+            };
+        }
+    }
+
+    log::debug!("Generating using {} with length {}", character_set, length);
+
+    let mut rng = thread_rng();
+    let generated = character_set.generate(arguments.length, &mut rng);
+
+    if let Some(path) = path {
+        log::debug!("Writing to {}", path);
+        fs::write(path, &generated)?;
+    } else {
+        println!("{}", generated);
+    }
+
+    Ok(())
 }