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UNIX® Shells by Example, Third Edition
book

UNIX® Shells by Example, Third Edition

by Ellie Quigley
October 2001
Intermediate to advanced content levelIntermediate to advanced
1040 pages
22h 50m
English
Pearson
Content preview from UNIX® Shells by Example, Third Edition

8.1. Startup

If the Bourne shell is your login shell, it follows a chain of processes before you see a shell prompt.

Figure 8.1. Starting the Bourne shell.

The first process to run is called init, PID 1. It gets instructions from a file called inittab (System V), or it spawns a getty process (BSD). These processes open up the terminal ports, providing a place where standard input comes from and a place where standard output and error go, and they put a login prompt on your screen. The /bin/login program is then executed. The login program prompts for a password, encrypts and verifies the password, sets up an initial environment, and starts up the ...

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Publisher Resources

ISBN: 013066538XPurchase book