Βιβλιογραφία
- S. R. Bourne.
An introduction to the UNIX shell.
In UNIX Users' Supplementary Documents. Computer Systems
  Research Group, Department of Electrical Engineering and Computer Science,
  University of California, Berkeley, California 94720, April 1986.
4.3 Berkeley Software Distribution.
 - Brian W. Kernighan and Rob
  Pike.
The UNIX Programming Environment.
Prentice-Hall, 1984.
 - John Sebes.
Comparing UNIX shells.
In Mitchell Waite, editor, UNIX Papers for UNIX Developers and Power
  Users, chapter 4, pages 122-151. Howard W. Sams & Company, 1987.