cursor control in console

Scott Castaline hscast at
Mon Oct 6 18:50:12 PDT 2008

Scott Castaline wrote:
> Jordan Bray wrote:
>>      > While reading your response I had rebotted vbox vm to livecd and
>>     did a
>>      > lspci. I noticed 2 lines that were different that seems like when the
>>      > livecd was created they had the source code for the vbox guest
>>     additions
>>      > software for linux. The 2 lines are as follows, first from my created
>>      > LFS and then from the LiveCD:
>>      > 00:02.0 VGA compatible controller: Unknown device 80ee:beef
>>      > 00:04.0 System peripheral: Unknown device 80ee:cafe
>>      >
>>      > 00:02.0 VGA compatible controller: InnoTek Systemberatung GmbH
>>      > VirtualBox Graphics Adapter
>>      > 00:04.0 System peripheral: InnoTek Systemberatung GmbH VirtualBox
>>     Guest
>>      > Service
>> That's to be expected.  Your's should still work.
>>     using vt100 didn't do anything. "echo '" gave me a > as though I was
>> That's what it was supposed to do.  I wanted to see if you were 
>> experiencing the same problem with that prompt that you were with the 
>> normal one.
>>     breaking up a long command over several lines. executing sh did
>>     eliminate some of the quirkiness in that it would just do the horizontal
>>     scroll. To simulate the behavior I'll just hold down the key to
>>     duplicate that character. What happens is the line with the prompt will
>>     fill up until aroungd character pos 72 then drop down to the neext line
>>     as though it was doing a \CR\LF of course no prompt on that line and
>>     continue printing out the character, only now it goes beyond pos # 72
>>     and does the horiz. scroll. I'll hit enter and of course the system 
>>     response is no such command. I'll hit the up arrow to recall the last
>>     command line and the cursor will positioned several characters to the
>>     left of the last character position. If I hit the left arrow once then
>>     end it'll move the cursor to the end of the command line. I then
>>     backspace continuously untill it wipes out even the prompt but will
>>     leave a number of characters at the right end. If I hit enter my prompt
>>     comes back with the cursor in the right position. It's almost like
>>     something thinks that the command line is inverted with what it thinks
>>     is the prompt but to the right.
>> Did you experience any difficulty compiling the readline package?  I 
>> would probably recompile that.  Afterwards, do an ldd /bin/bash to 
>> ensure it's using the new library.  Try this:
>> [code]
>> ...$python
>> ...
>>  >>> 
>> 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30
>> 465
>>  >>> # now hit the up arrow key and see if you're experiencing the same 
>> quirkyness
>>  >>> ^D
>> ...$
>> [/code]
>> This may help diagnose the problem since I know that python uses the 
>> readline package.
>> -- 
>> /me
> Don't have python installed yet, may give that a shot. Get back to you 
> on the results. As far as readline install I don't recall seeing any 
> problems, as I'm sure I wouldn't have gone on from there had I. Would I 
> be able to just redo the install of the readline pkge? Wouldn't that 
> affect any susbsequent pkge installs?
got python installed and tried your routine and within python the curser 
behaves right. Exit out of python back to the bash shell and cursor gets 
all freaky again like a bad acid trip from the 60's. It does somewhat 
straightens out when I sh within the shell, just does the Hz. scroll on 
the same line.

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