Error while piping

[Bjorn Waller]

Hi,

I keep getting an error while piping in bash. For instance:
'ps -ef | grep foo' often (but not always) results in:
bash:  grep: command not found

grep is installed!

Do you know whats wrong? 

 bash --version
GNU bash, version 2.05.1(1)-release (i586-mandrake-linux-gnu)
Copyright 2000 Free Software Foundation, Inc.

Thanks
/Björn


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