| Enclose the keywords in quotes and separate them with the OR symbol | . |
Sometimes it is natural to reach for |, but | in a shell command also denotes a pipe, so you may not be able to work out whether you can use it. In fact, adding quotes on top of that makes the distinction. For example:
grep -E 'Start|Finish' <filename> // Use the -E option to filter out the lines in the file that contain Start or Finish
egrep 'Start|Finish' filename // Using egrep saves you the -E option; it is supported by default