diff --git a/src/authors/csv/reader.rs b/src/authors/csv/reader.rs
index 9afdea7..b575f7e 100644
--- a/src/authors/csv/reader.rs
+++ b/src/authors/csv/reader.rs
@@ -2,6 +2,7 @@ use super::super::author::{Author, AuthorsProvider};
 use super::mapper;
 use crate::authors::err::AuthorsError;
 use crate::common::conf;
+use crate::common::err::SystemError;
 use crate::common::fs::file_reader::{Lines, Reader};
 use crate::cositas::CustomResult;
 use std::env;
@@ -34,7 +35,7 @@ impl CSVReader {
 	fn from_cwd_fallback_home(file_reader: &dyn Reader) -> CustomResult<Self> {
 		let file_path = &conf::authors_file();
 		let dir_path = &conf::authors_dir();
-		let cwd = env::current_dir()?;
+		let cwd = env::current_dir().map_err(|_| SystemError::EnvVar("CWD".to_string()))?;
 
 		file_reader
 			.read_non_empty_lines(&cwd.join(file_path))
diff --git a/src/common/err.rs b/src/common/err.rs
index 4a00baf..bb79ee0 100644
--- a/src/common/err.rs
+++ b/src/common/err.rs
@@ -3,8 +3,11 @@ use std::{any::Any, error::Error, fmt::Display};
 
 #[derive(Debug)]
 pub enum SystemError {
-	Runner(String),
+	Runner(String, String),
 	Unknown(String),
+	Read(String),
+	Write(String),
+	EnvVar(String),
 }
 
 impl Error for SystemError {}
@@ -17,10 +20,13 @@ impl CustomError for SystemError {
 
 impl PartialEq for SystemError {
 	fn eq(&self, other: &Self) -> bool {
-		matches!((self, other), |(SystemError::Runner(_), SystemError::Runner(_))| (
-			SystemError::Unknown(_),
-			SystemError::Unknown(_)
-		))
+		matches!((self, other), |(
+			SystemError::Runner(_, _),
+			SystemError::Runner(_, _),
+		)| (SystemError::Unknown(_), SystemError::Unknown(_))
+			| (SystemError::Read(_), SystemError::Read(_))
+			| (SystemError::Write(_), SystemError::Write(_))
+			| (SystemError::EnvVar(_), SystemError::EnvVar(_)))
 	}
 }
 
@@ -28,8 +34,11 @@ impl Display for SystemError {
 	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 		write!(f, "System failure: ")?;
 		match self {
-			SystemError::Runner(err) => write!(f, "Command failed with: {err}"),
+			SystemError::Runner(cmd, err) => write!(f, "Command {cmd} failed with: {err}"),
 			SystemError::Unknown(err) => write!(f, "{err}"),
+			SystemError::Read(err) => write!(f, "Could not read {err}"),
+			SystemError::Write(err) => write!(f, "Could not write {err}"),
+			SystemError::EnvVar(var) => write!(f, "Could not get {var} from env var"),
 		}
 	}
 }
@@ -41,12 +50,24 @@ mod tests {
 	#[test]
 	fn test_system_error_display() {
 		assert_eq!(
-			format!("{}", SystemError::Runner("error".to_string())),
-			"System failure: Command failed with: error"
+			format!("{}", SystemError::Runner("cmd".to_string(), "error".to_string())),
+			"System failure: Command cmd failed with: error"
 		);
 		assert_eq!(
 			format!("{}", SystemError::Unknown("oops".to_string())),
 			"System failure: oops"
 		);
+		assert_eq!(
+			format!("{}", SystemError::Read("file".to_string())),
+			"System failure: Could not read file"
+		);
+		assert_eq!(
+			format!("{}", SystemError::Write("file".to_string())),
+			"System failure: Could not write file"
+		);
+		assert_eq!(
+			format!("{}", SystemError::EnvVar("var".to_string())),
+			"System failure: Could not get var from env var"
+		);
 	}
 }
diff --git a/src/common/fs/file_reader.rs b/src/common/fs/file_reader.rs
index a25f92a..274672c 100644
--- a/src/common/fs/file_reader.rs
+++ b/src/common/fs/file_reader.rs
@@ -1,4 +1,4 @@
-use crate::cositas::CustomResult;
+use crate::{common::err::SystemError, cositas::CustomResult};
 use std::{
 	fs::File,
 	io::{BufRead, BufReader},
@@ -22,10 +22,12 @@ impl SimpleReader {
 
 impl Reader for SimpleReader {
 	fn read_non_empty_lines(&self, path: &Path) -> CustomResult<Lines> {
-		Ok(BufReader::new(File::open(path)?)
-			.lines()
-			.map_while(core::result::Result::ok)
-			.filter(|line| !line.trim().is_empty())
-			.collect())
+		Ok(
+			BufReader::new(File::open(path).map_err(|e| SystemError::Read(e.to_string()))?)
+				.lines()
+				.map_while(core::result::Result::ok)
+				.filter(|line| !line.trim().is_empty())
+				.collect(),
+		)
 	}
 }
diff --git a/src/common/fs/file_writer.rs b/src/common/fs/file_writer.rs
index 638f87f..023f6ee 100644
--- a/src/common/fs/file_writer.rs
+++ b/src/common/fs/file_writer.rs
@@ -2,6 +2,7 @@ use std::fs::{File, OpenOptions};
 use std::io::Write;
 use std::path::Path;
 
+use crate::common::err::SystemError;
 use crate::cositas::CustomResult;
 
 #[cfg_attr(test, mockall::automock)]
@@ -18,19 +19,29 @@ impl SimpleWriter {
 	}
 
 	fn write(mut file: File, content: &str) -> CustomResult<()> {
-		file.write_all(content.as_bytes())?;
-		file.flush().map_err(Into::into)
+		file.write_all(content.as_bytes())
+			.map_err(|e| SystemError::Write(e.to_string()))?;
+		Ok(file.flush().map_err(|e| SystemError::Write(e.to_string()))?)
 	}
 }
 
 impl Writer for SimpleWriter {
 	fn overwrite(&self, path: &Path, content: &str) -> CustomResult<()> {
-		let file = OpenOptions::new().write(true).truncate(true).create(true).open(path)?;
+		let file = OpenOptions::new()
+			.write(true)
+			.truncate(true)
+			.create(true)
+			.open(path)
+			.map_err(|e| SystemError::Write(e.to_string()))?;
 		Self::write(file, content)
 	}
 
 	fn append(&self, path: &Path, content: &str) -> CustomResult<()> {
-		let file = OpenOptions::new().write(true).append(true).open(path)?;
+		let file = OpenOptions::new()
+			.write(true)
+			.append(true)
+			.open(path)
+			.map_err(|e| SystemError::Write(e.to_string()))?;
 		Self::write(file, content)
 	}
 }
diff --git a/src/common/runner.rs b/src/common/runner.rs
index be431c9..f941fb5 100644
--- a/src/common/runner.rs
+++ b/src/common/runner.rs
@@ -20,15 +20,23 @@ impl CommandRunner {
 
 impl Runner for CommandRunner {
 	fn spawn(&self, cmd: &str, arg: &str) -> CustomResult<()> {
-		Ok(Command::new(cmd).arg(arg).spawn().map(|_| ())?)
+		Ok(Command::new(cmd)
+			.arg(arg)
+			.spawn()
+			.map(|_| ())
+			.map_err(|e| SystemError::Runner(cmd.to_string(), e.to_string()))?)
 	}
 
 	fn run(&self, cmd: &str, arg: &str) -> CustomResult<()> {
-		Command::new(cmd)
+		if Command::new(cmd)
 			.arg(arg)
-			.status()?
+			.status()
+			.map_err(|e| SystemError::Runner(cmd.to_string(), e.to_string()))?
 			.success()
-			.then_some(())
-			.ok_or(SystemError::Runner("Command failed".to_string()).into())
+		{
+			Ok(())
+		} else {
+			Err(SystemError::Runner(cmd.to_string(), "exit code 1".to_string()).into())
+		}
 	}
 }
diff --git a/src/cositas.rs b/src/cositas.rs
index 7b7e86b..1df955a 100644
--- a/src/cositas.rs
+++ b/src/cositas.rs
@@ -36,15 +36,9 @@ impl From<git2::Error> for Box<dyn CustomError> {
 	}
 }
 
-impl From<std::io::Error> for Box<dyn CustomError> {
-	fn from(e: std::io::Error) -> Box<dyn CustomError> {
-		Box::new(SystemError::Unknown(e.to_string()))
-	}
-}
-
 impl From<std::env::VarError> for Box<dyn CustomError> {
 	fn from(e: std::env::VarError) -> Box<dyn CustomError> {
-		Box::new(SystemError::Unknown(e.to_string()))
+		Box::new(SystemError::EnvVar(e.to_string()))
 	}
 }