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chmod:		change file mode	permission ;
chown:		change file group	owner;
fstat:		get file		status ;
fork:		create new		process ;
chdir:		change directory ;
mkdir:		create directory new ;
open:		create file		open read write;
read:		file input		read ;
rmdir:		directory file		remove ;
write:		file output		write ;
creat:		create file new ;
access:		access check file ;