ZiLOG System 8000 User Manual page 53

USER
43
EOF
file name
Zilog USER
An
~-Qf-~
is generated whenever a
90mmand reads to the end of a file that
it has been given as input. It can also
be generated at the terminal with a
control-~.
Commands rece1v1ng input
from a
~
receive an end-of-file \vhen
the command sending them input com-
pletes. Most commands terminate when
they receive an end-of-file. The shell
has an option to ignore end-of-file from
a terminal input, which makes it possi-
ble to avoid logging out accidentally by
typing too many control-d's.
Each file in ZEUS has a name consisting
of up to 14 characters, not including
the slash character
(I),
which is used
in path name building. Most file names
do not begin with the pericd character.
They contain only letters and digits,
with perhaps a pericd separating the
root portion of the file 'name from an
extension.
horne directory Each user has a horne directory,' which is
given in the password file 1~/passwd.
The user is placed in the horne directory
when first logging in. The
~
or chdir
command with no arguments returns the
user to this directory. The name of
this directory is recorded in the shell
variable
~.
Immediate (I) addressing mode
In this mode, the operand is contained
within the instruction.
Index (X) addressing mode
In this mode, the operand address is
obtained by adding the contents of an
index' register to a base address con-
tained in the instruction.
index register A word register used to contain a dis-
placement for use in effective address
calculation.
Zilog
43