[Bug 1004719] [NEW] Shell writes garbage

[Sworddragon]

Public bug reported:

I'm using the Ubuntu 12.04 alternate installation cd and the shell from
"Execute a shell" doesn't write correctly to stdout if the cursor offset
is 5 bytes to the left from the end of the string. Steps to reproduce:

1. Select "English"
2. Press F4 and choose "Install a commandline-system"
3. Press F6 and choose "Expert mode"
4. Choose "Install Ubuntu"
5. Choose "Execute a shell"
6. Type in the shell "echo 0" and press enter
7. Press the upper arrow to repeat the last command
8. Press the left arrow 5 times
9. Type "0"
10. Bug: The cursor jumped now to the end of the command
11. Type "0"
12. Bug: The shell appended "0cho 0" instead of "0"

** Affects: busybox (Ubuntu)
     Importance: Undecided
         Status: New

** Package changed: dash (Ubuntu) => busybox (Ubuntu)

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https://bugs.launchpad.net/bugs/1004719

Title:
  Shell writes garbage

Status in “busybox” package in Ubuntu:
  New

Bug description:
  I'm using the Ubuntu 12.04 alternate installation cd and the shell
  from "Execute a shell" doesn't write correctly to stdout if the cursor
  offset is 5 bytes to the left from the end of the string. Steps to
  reproduce:

  1. Select "English"
  2. Press F4 and choose "Install a commandline-system"
  3. Press F6 and choose "Expert mode"
  4. Choose "Install Ubuntu"
  5. Choose "Execute a shell"
  6. Type in the shell "echo 0" and press enter
  7. Press the upper arrow to repeat the last command
  8. Press the left arrow 5 times
  9. Type "0"
  10. Bug: The cursor jumped now to the end of the command
  11. Type "0"
  12. Bug: The shell appended "0cho 0" instead of "0"

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