posix library:
 access(path,[mode]) 		 pathconf(path,[selector]) 
 chdir(path) 			 putenv(string) 
 chmod(path,mode) 		 readlink(path) 
 chown(path,uid,gid) 		 rmdir(path) 
 ctermid() 			 setenv(name,value,[over]) 
 dir([path]) 			 setgid(name or id) 
 errno() 			 setuid(name or id) 
 exec(path,[args]) 		 sleep(seconds) 
 files([path]) 			 stat(path,[selector]) 
 fork() 			 symlink(oldpath,newpath) 
 getcwd() 			 sysconf([selector]) 
 getenv([name]) 		 times() 
 getgroup(name or id) 		 ttyname(fd) 
 getlogin() 			 umask([mode]) 
 getpasswd(name or id) 		 uname([string]) 
 getprocessid([selector]) 	 unlink(path) 
 kill(pid,[sig]) 		 unsetenv(name) 
 link(oldpath,newpath) 		 utime(path,[mtime,atime]) 
 mkdir(path) 			 version 
 mkfifo(path) 			 wait([pid]) 
