regarding grep regular expression


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# 1  
regarding grep regular expression

When i do ls -ld RT_BP* i am getting the following list.

drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP809
drwxrwx--- 2user group 256 Oct 17 10:09 RT_BP809.O
drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP810
drwxrwx--- 2user group 256 Oct 17 10:09 RT_BP810.O
drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP811
drwxrwx--- 2user group 256 Oct 17 10:09 RT_BP811.O

But i need the list without .O at the end only

OutPut
drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP809
drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP810
drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP811

Thanks
# 2  
Some shells will do pattern matching like this

Code:
ls -ld RT_BP*[0-9]

which means the filename must end with one numeric character.
# 3  
ls -ld RT_BP* | grep -v "O$"
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