[RTEMS Project] #4763: Detect terminal size

[RTEMS trac]

#4763: Detect terminal size
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  Reporter:  Chris Johns  |      Owner:  Chris Johns
      Type:  enhancement  |     Status:  assigned
  Priority:  normal       |  Milestone:  6.1
 Component:  shell        |    Version:  6
  Severity:  normal       |   Keywords:
Blocked By:               |   Blocking:
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 Add support to set the rows and columns in the shell. RTEMS does not have
 a full tty system and does not carry `terminfo` so implement a shell based
 approach to let some commands manage the terminal size.

 Update the `edit` command to support the terminal size.

 Fix the help lines.

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Ticket URL: <http://devel.rtems.org/ticket/4763>
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