[CentOS] -bash: /bin/grep: cannot execute binary file

Hi all,I have problem on CentOS 5.2

while everything is working great,suddenly i have this error when i login my
server,

sudo su -
-bash: /bin/egrep: cannot execute binary file
-bash: /bin/egrep: cannot execute binary file
-bash: /bin/egrep: cannot execute binary file
-bash: /bin/hostname: cannot execute binary file
-bash: /bin/grep: cannot execute binary file
-bash: /bin/grep: cannot execute binary file
-bash: /bin/grep: cannot execute binary file
-bash: /bin/grep: cannot execute binary file
[root at centos ~]#

and when i try use vi editor,i have same error like above

-bash: /bin/vi: cannot execute binary file


What is problem do you think ?
i searched this problem on google but did not found any reasonable answer.

Thanks all for all helps.


-- 
Iyi calismalar.Basarilar...
Semih Gokalp
Istanbul/Turkiye
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