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cat -n hrun.log | tail -n 50

cat hrun.log | head -n 50
cat -n hrun.log | grep "ÐÂÔöÓû§" -C 10
cat hrun.log | grep "ÐÂÔöÓû§" -B 10

cat hrun.log | grep "ÐÂÔöÓû§" -A 10
cat hrun.log | grep "ÐÂÔöÓû§"

˵Ã÷：
-A ±íʾ¹Ø¼ü×ÖÖ®ºó，After
-B ±íʾ¹Ø¼ü×Ö֮ǰ，Before
-C ±íʾ¹Ø¼ü×ÖÇ°ºó，Context