A multitasking, multi-user computer operating system originally developed in 1969, variants of which now form the underpinning of many operating systems, including OS X, iOS, and Linux.
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Use these additional resources for reference and additional practice
Read The Linux Programming Interface. Chapters 1, 2, 6, 8, 10, 14, 15, 18, 25, 44, 62.
Read 'Learning the Shell'
Read about I/O redirection.
Beginning UNIX developers should be able to
You can use these commands and operators: |, <, >, >>, &, ack, awk, cat, chmod, chown, cp, export, find, kill, locate, ls, mkdir, mv, ps, rm, sed, sort, tail, top, vim, whereis, xargs.