Chapter 1. The Environment
The assumption of this book, and particularly this chapter, is that you are at least familiar with a shell. You have typed in some commands—such as changing your password—and are fairly comfortable with the environment. The chapter begins by explaining a few items common to all scripts, including comments and the cryptic #!/bin/ksh that mysteriously lurks on the first line of most shell scripts. After that, a few environment issues are explained.
This chapter teaches you the following:
The meaning of #! /bin/ksh
How to understand file and directory permissions
How to use the chmod and umask commands
How to provide comments in your script
How to use the .profile file
What the Korn shell environment options are
How to use shell ...
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