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diff --git a/include/os.hpp b/include/os.hpp
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+// Display images inside a terminal
+// Copyright (C) 2023  JustKidding
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef NAMESPACE_OS_H
+#define NAMESPACE_OS_H
+
+#include <optional>
+#include <string>
+
+namespace os
+{
+
+auto exec(const std::string &cmd) -> std::string;
+auto getenv(const std::string &var) -> std::optional<std::string>;
+auto read_data_from_fd(int filde, char sep = '\n') -> std::string;
+auto read_data_from_stdin(char sep = '\n') -> std::string;
+auto wait_for_data_on_fd(int filde, int waitms) -> bool;
+auto wait_for_data_on_stdin(int waitms) -> bool;
+
+auto get_pid() -> int;
+auto get_ppid() -> int;
+
+void get_process_info(int pid);
+void daemonize();
+
+} // namespace os
+
+#endif