linux - How to search multiple patterns in using grep command? -


i learning use grep , tried use following commands find entries in /var/log/messages file, errors:

grep "oct 23 21:22:44" | "80" /var/log/messages

i error this. tried following , replaced double quotes single quotes:

grep 'oct 23 21:22:44' | '80' /var/log/messages

this did not work either. why wrong because can search multiple patterns using pipe! because oct 23 21:22:44 , 80 in different places!

80 , date in different orders in file!

this syntax:

grep "oct 23 21:22:44" | "80" /var/log/messages

is equivalent running grep , pass output file called 80.

a way need enabling -e option (--extended-regexp) able use | as-is, this:

grep -e "oct 23 21:22:44|80" /var/log/messages

-

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