linux - Unix command for searching multiple keywords -

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need check in error log on unix server multiple sites, ex. lets there 3 sites abc.com, xyz.com , opq.com. want error log server of these sites lies.

i tried 

tail -99999  /apache/log/error_log| grep 'abc | xyz | opq'

but not working..

just use egrep:

tail -99999  /apache/log/error_log| egrep '(abc|xyz|opq)'

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