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www.eeworm.com/read/216502/4890801
p4
.SH
VI. THE SHELL
.PP
For most users,
communication with
the system
is carried on with the
aid of a program called the \&shell.
The \&shell is a
command-line interpreter: it reads lines typed by the u
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p6
.SH
IX. STATISTICS
.PP
The following numbers
are presented to suggest the scale of the Research
.UX
operation.
Those of our users
not involved in document preparation
tend to use the system for
progra
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p3
.SH
V. PROCESSES AND IMAGES
.PP
An
.IT image
is a computer execution environment.
It includes a memory image,
general register values,
status of open files,
current directory and the like.
An image is
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p pk.p
/*
* kernel level
*/
#ifdef KERNEL
#define PADDR ((struct pack *)tp->t_linep)
#define TURNOFF pkturnoff(tp)
#define UCOUNT u.u_count
#define S tp
#define P pk->p_ttyp
#define SDEF struct tty
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p2
.s2
3.6 I/O calls
.es
The system calls to do I/O are designed to eliminate
the differences between the various devices and styles of
access.
There is no distinction between ``random''
and ``sequential
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p5
.s1
7. Traps
.es
The \*sPDP\*n-11 hardware detects a number of program faults,
such as references to non-existent memory, unimplemented instructions,
and odd addresses used where an even address is re
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p1
.wh -1i fo
.sp 1.25i
.wh 0 hd
.ps 16
.ft B
.ce
The U\s14NIX\s16 Time-Sharing System
.ft I
.sp .3i
.ce 2
\*nDennis M. Ritchie
Ken Thompson
.ce 2
Bell Laboratories
Murray Hill, N. J. 07974
.fi
.ft B
.
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p4
.s1
6. The Shell
.es
For most users,
communication with \*sUNIX\*n is carried on with the
aid of a program called the Shell.
The Shell is a command
line interpreter: it reads lines typed by the user a
www.eeworm.com/read/216499/4892538
p6
.s1
9. Statistics
.es
The following numbers
are presented to suggest the scale of our operation.
Those of our users
not involved in document preparation
tend to use the system for
program development,
www.eeworm.com/read/216499/4892539
p3
.s1
5. Processes and images
.es
An
.ft I
image
.ft
is a computer execution environment.
It includes a core image,
general register values,
status of open files,
current directory and the like.
An imag