"access"
"chdir"
"chmod"
"chown"
"ctermid"
"dir"
"errno"
"exec"
"files"
"fork"
"getcwd"
"getenv"
"getgroup"
"getlogin"
"getpasswd"
"getprocessid"
"kill"
"link"
"mkdir"
"mkfifo"
"pathconf"
"putenv"
"readlink"
"rmdir"
"setgid"
"setuid"
"sleep"
"stat"
"symlink"
"sysconf"
"times"
"ttyname"
"umask"
"uname"
"unlink"
"utime"
"wait"
"setenv"