int load_env_file(FILE *f, const char *fname, const char *separator, char ***l);
int load_env_file_pairs(FILE *f, const char *fname, const char *separator, char ***l);
+int merge_env_file(char ***env, FILE *f, const char *fname);
+
int write_env_file(const char *fname, char **l);
int executable_is_script(const char *path, char **interpreter);