Excluding multiple patterns with one grep command

grep does not necessarily need input from a pipe, so you could do

grep -vE '90\.192\.142\.138|PIX|Intrusion' cisco.log-20151103.log

Capital E switches on regular expression mode and dots need to be escaped in this case.

two other options

grep -v -e 90.192.142.138 -e PIX -e Intrusion cisco.log-20151103.log

and assuming fixed strings

grep -vF '90.192.142.138
PIX
Intrusion
' cisco.log-20151103.log

grep -vE "90.192.142.138|PIX|Intrusion" cisco.log-20151103.log

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