HP Visualize J5000 HP Workstations - Graphics Administration Guide For Red Hat - Page 45

hostname, displaynumber, screennumber, C Shell, GNU Bash Shell, transport layer

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hostname The hostname specifies the name of the machine to which the display is physically connected. If the hostname is not given, the most efficient way of communicating to a server on the same machine will be used. displaynumber The phrase "display" is usually used to refer to the collection of monitors that share a common keyboard and pointer (mouse, tablet, etc.). Most workstations tend to only have one keyboard, and therefore, only one display. Larger, multiuser systems, however, will frequently have several displays so that more than one person can be doing graphics work at once. To avoid confusion, each display on a machine is assigned a display number (beginning at 0) when the X server for that display is started. The display number must always be given in a display name. screennumber Some displays share a single keyboard and pointer among two or more monitors. Since each monitor has its own set of windows, each screen is assigned a screen number (beginning at 0) when the X server for that display is started. If the screen number is not given, then screen 0 will be used. On POSIX systems, the default display name is stored in your DISPLAY environment variable. This variable is set automatically by the xterm terminal emulator. However, when you log into another machine on a network, you'll need to set DISPLAY by hand to point to your display. For example, % setenv DISPLAY myws:0 (C Shell) $ DISPLAY=myws:0; export DISPLAY (GNU Bash Shell) The xon script can be used to start an X program on a remote machine; it automatically sets the DISPLAY variable correctly. Finally, most X programs accept a command line option of "-display displayname" to temporarily override the contents of DISPLAY. This is most commonly used to pop windows on another person's screen or as part of a "remote shell" command to start an xterm pointing back to your display. For example, $ xload -display joesws:0 -geometry 100x100+0+0 $ rsh big xterm -display myws:0 -ls

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hostname
The hostname specifies the name of the machine to which the display is
physically connected. If the hostname is not given, the most efficient way of
communicating to a server on the same machine will be used.
displaynumber
The phrase "display" is usually used to refer to the collection of monitors that
share a common keyboard and pointer (mouse, tablet, etc.). Most workstations
tend to only have one keyboard, and therefore, only one display. Larger, multi-
user systems, however, will frequently have several displays so that more than
one person can be doing graphics work at once. To avoid confusion, each display
on a machine is assigned a display number (beginning at 0) when the X server for
that display is started. The display number must always be given in a display
name.
screennumber
Some displays share a single keyboard and pointer among two or more monitors.
Since each monitor has its own set of windows, each screen is assigned a screen
number (beginning at 0) when the X server for that display is started. If the screen
number is not given, then screen 0 will be used.
On POSIX systems, the default display name is stored in your
DISPLAY
environment
variable. This variable is set automatically by the
xterm
terminal emulator. However,
when you log into another machine on a network, you'll need to set
DISPLAY
by hand
to point to your display. For example,
% setenv DISPLAY myws:0
(C Shell)
$ DISPLAY=myws:0; export DISPLAY
(GNU Bash Shell)
The
xon
script can be used to start an X program on a remote machine; it automatically
sets the
DISPLAY
variable correctly.
Finally, most X programs accept a command line option of "
-display
displayname
"
to temporarily override the contents of
DISPLAY
. This is most commonly used to pop
windows on another person's screen or as part of a "remote shell" command to start an
xterm
pointing back to your display. For example,
$ xload -display joesws:0 -geometry 100x100+0+0
$ rsh big xterm -display myws:0 -ls </dev/null &
X servers listen for connections on a variety of different communications channels
(network byte streams, shared memory, etc.). Since there can be more than one way of
contacting a given server, the
hostname
part of the display name is used to determine the
type of channel (also called a
transport layer
) to be used. X servers generally support
the following types of connections:
Graphics Administration Guide For Red Hat Linux 6.2