diff --git a/src/details/os_unix.cpp b/src/details/os_unix.cpp
index 80ac731f..98550bc3 100644
--- a/src/details/os_unix.cpp
+++ b/src/details/os_unix.cpp
@@ -99,19 +99,6 @@ bool fopen_s(FILE **fp, const filename_t &filename, const filename_t &mode) {
     return *fp == nullptr;
 }
 
-int remove(const filename_t &filename) noexcept { return std::remove(filename.c_str()); }
-
-int remove_if_exists(const filename_t &filename) noexcept { return path_exists(filename) ? remove(filename) : 0; }
-
-int rename(const filename_t &filename1, const filename_t &filename2) noexcept {
-    return std::rename(filename1.c_str(), filename2.c_str());
-}
-
-// Return true if path exists (file or directory)
-bool path_exists(const filename_t &filename) noexcept {
-    struct stat buffer {};
-    return (::stat(filename.c_str(), &buffer) == 0);
-}
 
 // Return file size according to open FILE* object
 size_t filesize(FILE *f) {
@@ -244,7 +231,10 @@ void sleep_for_millis(unsigned int milliseconds) noexcept {
     std::this_thread::sleep_for(std::chrono::milliseconds(milliseconds));
 }
 
-std::string filename_to_str(const filename_t &filename) { return filename; }
+std::string filename_to_str(const filename_t &filename) { 
+    static_assert(std::is_same_v<filename_t::value_type, char>, "filename_t type must be char");
+    return filename; 
+}
 
 int pid() noexcept { return static_cast<int>(::getpid()); }
 
@@ -277,49 +267,6 @@ bool is_color_terminal() noexcept {
 // Source: https://github.com/agauniyal/rang/
 bool in_terminal(FILE *file) noexcept { return ::isatty(fileno(file)) != 0; }
 
-// return true on success
-static bool mkdir_(const filename_t &path) { return ::mkdir(path.c_str(), static_cast<mode_t>(0755)) == 0; }
-
-// create the given directory - and all directories leading to it
-// return true on success or if the directory already exists
-bool create_dir(const filename_t &path) {
-    if (path_exists(path)) {
-        return true;
-    }
-
-    if (path.empty()) {
-        return false;
-    }
-
-    size_t search_offset = 0;
-    do {
-        auto token_pos = path.find_first_of(folder_seps_filename, search_offset);
-        // treat the entire path as a folder if no folder separator not found
-        if (token_pos == filename_t::npos) {
-            token_pos = path.size();
-        }
-
-        auto subdir = path.substr(0, token_pos);
-
-        if (!subdir.empty() && !path_exists(subdir) && !mkdir_(subdir)) {
-            return false;  // return error if failed creating dir
-        }
-        search_offset = token_pos + 1;
-    } while (search_offset < path.size());
-
-    return true;
-}
-
-// Return directory name from given path or empty string
-// "abc/file" => "abc"
-// "abc/" => "abc"
-// "abc" => ""
-// "abc///" => "abc//"
-filename_t dir_name(const filename_t &path) {
-    auto pos = path.find_last_of(folder_seps_filename);
-    return pos != filename_t::npos ? path.substr(0, pos) : filename_t{};
-}
-
 std::string getenv(const char *field) {
     char *buf = ::getenv(field);
     return buf != nullptr ? buf : std::string{};