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UPDATE 3 - Better Solution

I kept Google'ing this until I came to a different solution. I ended up downloading the terminfo directory from somewhere (I forgot where so I just posted the zip on my website here) and replaced my current working terminfo directory with the new stuff.

The terminfo directory, for me, is located at...

/usr/share/terminfo

UPDATE 2

bahamat helped me get to the solution. I added the following to my .profile...

TERM="xterm"
export TERM

... and I am still able to keep "xterm-256color".

UPDATE

I figured out why this is happening. At one point, I changed some settings...

enter image description here

The default is "xterm-color" and I changed it to "xterm-256color". Is there a reason for this to be happening?


I just set up a second admin user account on a fresh install of Mac OS X Lion and now when I try to clear the terminal, I get the following error...

Hristo $ clear
terminals database is inaccessible

This is a problem for both user accounts and I have no idea why. I'm not sure if this is much help, but here is what $TERM is set to...

Hristo $ echo $TERM
xterm-256color

Any thoughts as to why this might be happening?

Let me know if I need to show my .bashrc or .profile.

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up vote 3 down vote accepted

Looks like your TERM value isn't recognized. You are probably setting the TERM value in your .profile (or similar) or you've got missing/corrupt files or invalid permissions in /usr/share/terminfo/.

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hmm... I am not setting the TERM value in neither account's .profile and the permissions are 755 for all directories under /usr/share/terminfo/ with owners root wheel – Hristo Aug 6 '11 at 22:41
    
Run echo $TERM and tell me what it says. – bahamat Aug 6 '11 at 22:57
    
@bahamat... that is in my post above. it says "xterm-256color" – Hristo Aug 6 '11 at 22:58
    
Sorry, don't know why I missed that. Look at /usr/share/terminfo/78/xterm-256color. Does it exist? Is it readable by you? Try changing your TERM to xterm and see if the problem persists. – bahamat Aug 6 '11 at 23:03
    
xterm-256color does not exist and how would I change TERM to xterm? – Hristo Aug 6 '11 at 23:15

In Mac OS X Lion 1.07, Terminal now supports 256 colors, Background Color Erase (BCE) and some other features that make it more compatible with modern xterm, and the default value for $TERM is now xterm-256color instead of xterm-color (which represents an older branch of xterm with less functionality).

If you upgrade to Lion, any settings profiles that used xterm-color will use the new default. (All "Declare terminal as" does is set the value of $TERM, by the way.)

The error you're seeing indicates that the appropriate terminfo files for xterm-256color are either missing or inaccessible. You might try installing Lion again. Also, some people have reported that installing Xcode 4 on Lion can cause this problem.

You can test the validity of xterm-256color with the following shell command:

infocmp xterm-256color

This will either display an error or the appropriate terminfo values for xterm-256color, and, if found, it displays the pathname to the terminfo file it used.

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running $ infocmp xterm-256color results in infocmp: couldn't open terminfo file (null). So I'm assuming something is wrong. I did install Xcode 4 but can't definitively say that it was the reason. Any suggestions? I would prefer not to reinstall Lion... – Hristo Aug 11 '11 at 7:44
    
... seems to work now... no idea what changed – Hristo Aug 11 '11 at 7:48
    
I'm missing the profile for xterm-256color under /usr/share/terminfo/78 as well. For now setting the default terminal back to xterm-color. – Ari Braginsky Oct 7 '11 at 19:06
    
Using xterm-color is not recommended, as it describes an older, less capable branch of Xterm. If xterm-256color isn't installed, the next best $TERM values to try are xterm-88color, xterm-16color and xterm, in that order. – Chris Page Oct 10 '11 at 8:36
    
Terminal's "Declare terminal as" preference setting only contains xterm, xterm-color and xterm-256color. However, you can set it to other values by editing preferences with defaults write com.apple.Terminal … or by editing the com.apple.Terminal.plist preferences file. Or, you can change the value of TERM in your shell startup file, e.g., put export TERM=xterm-88color in ~/.bashrc (and if you haven't already done this, create a ~/.bash_profile that runs ~/.bashrc). – Chris Page Oct 10 '11 at 8:50

xterm-256color should be present in /usr/share/terminfo/78.

Run this command and double check if it's there:

ls -laR /usr/share/terminfo

In the past, there were issues with Xcode messing up permissions to a huge degree. Worst case scenario, use disk utility and repair your permissions. You will need to boot from an install DVD and verify/repair your boot partition.

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