Grepping for stuff in MySQL dumps is not that nice, with miles-wide lines. You could send the grep output to a command such as "cut -c 1-200", but that would still not be guaranteed to give you the actual matched content.
Enter the "fold" command, which formats output into lines with a max count of chars:
grep "stuff" sqldump.sql | fold -w 200 | grep -C 1 "stuff"
... will give you a much better view of the context of the match!
(The first grep gets the (mile-wide) line that has the match, then fold will split the mile-wide line into 200 char long lines, and "grep -C 1" will show only the one 200 char wide line where the match is + 1 line of context before and after).