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Index | Description | Usage | Options | Variables | Hints | Bulletproof
overlay
[-# spawn_id] [-# spawn_id] [...] program
[args]
| Arguments |
Description |
| -#
spawn_id |
Spawn_ids
are mapped to file identifiers for the new program to inherit. For
example, the following line runs chess and allows it to be controlled by
the current process - say, a chess master.
overlay -0 $spawn_id -1
$spawn_id -2 $spawn_id chess |
| args |
optional
arguments to the program to overlay. |
A bare hyphen argument forces
a hyphen in front of the command name as if it was a login shell.
All spawn_ids are closed except for those named as arguments. These
are mapped onto the named file identifiers.
This is more efficient than
“interact -u”, however, it sacrifices the ability
to do programmed interaction since the Expect process is no longer in control.
Note that no controlling
terminal is provided. Thus, if you disconnect or remap standard input,
programs that do job control (shells, login, etc) will not function properly.
This material is excerpted
from the O'Reilly book "Exploring Expect" by Don Libes, and can also be
found in the manpage on many UNIX platforms.
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