Shell Programming and Scripting

I have the need to search a text file from my unix script to determine if it contains the strings of: 'ERROR' and/or 'WARNING'.

By using Grep I can search the file and return a where one of these strings exists. Like this:

Code:

cat myfile.txt | grep ERROR

Output:

Code:

PROCESS ERROR HERE

I'd like to know if someone could help me to write an 'if' condition that would output 'found' or 'not found' if either 'ERROR' or 'WARNING' is present in my text file? Something like this perhaps:

Pseudo code:

Code:

if myfile.txt contains 'ERROR' or 'WARNING' then
  echo 'found'
else
  echo 'not found'
end if

Help with this would be really appreciated. Thanks in advance.

Something like:

Code:

if egrep -q "ERROR|WARNING" myfile.txt; then
  echo FOUND
else
  echo NOT FOUND
fi

Using GNU grep:

Code:

grep -Eq "ERROR|WARNING" myfile.txt && echo "found" || echo "not found"

Perfect. Thanks for taking the time to help!