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768 pages, Hardcover
First published June 30, 1992
Earlier versions of the UNIX System did not have the mkdir function; it was introduced with
4.2BSD and SVR3. In the earlier versions, a process had to call the mknod function to create a
new directory — but use of the mknod function was restricted to superuser processes. To
circumvent this constraint, the normal command that created a directory, mkdir(1), had to be
owned by root with the set-user-ID bit on. To create a directory from a process, the mkdir(1)
command had to be invoked with the system(3) function.