posix library:
 access(path,[mode]) 
 basename(path) 
 chdir(path) 
 chmod(path,mode) 
 chown(path,uid,gid) 
 closelog() 
 ctermid() 
 dir([path]) 
 dirname(path) 
 dup(old,[new]) 
 errno([n]) 
 exec(path,[args]) 
 execp(path,[args]) 
 fdopen(fd, mode) 
 fileno(filehandle) 
 files([path]) 
 fork() 
 getcwd() 
 getenv([name]) 
 getgroup(name|id) 
 getlogin() 
 getpasswd(name|id,[sel]) 
 getpid([options]) 
 glob(pattern) 
 hostid() 
 kill(pid,[sig]) 
 link(old,new,[symbolic]) 
 mkdir(path) 
 mkfifo(path) 
 openlog(ident, [option], [facility]) 
 pathconf([path,options]) 
 pipe() 
 poll(filehandle, timeout) 
 readlink(path) 
 rmdir(path) 
 setenv(name,value,[over]) 
 setpid(option,...) 
 sleep(seconds) 
 stat(path,[options]) 
 sysconf([options]) 
 syslog(priority, message) 
 times([options]) 
 ttyname([fd]) 
 umask([mode]) 
 uname([string]) 
 unlink(path) 
 utime(path,[mtime,atime]) 
 version 
 wait([pid]) 
