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tr " " "\n" < input_file | grep -c search_word
You could add a -i flag to the grep if you want it case insensitive.

This will split the words on to separate lines. The search_word should really...

Yes it is a command line awk to find occurrence, the difference with script of clx is if there are several "am" in a line, i count it.

With awk, try also awk '{n+=gsub(/am/,"&")}END{print n}' file