shell - Ommit lines containing a specific pattern or string in a tail -f output -


everything in title think. here's little more info : write lot of data log file want tail -f on separate screen. want data written file don't need in tail -f output. example instead of having 

= 2016-11-10 17:11:06 ========================================================== pong not logged ================================================================================ = 2016-11-10 17:11:07 ========================================================== pong stan ================================================================================ = 2016-11-10 17:11:07 ========================================================== matchmaking { id: '20',   email: 'stanley@beatme.io',   gender: 'male',   fbid: '167198360375634',   console: '5',   game: '5',   beatmeid: 'stan',   fairplay: 100,   victories: 32,   wallet: 11950 } ================================================================================ = 2016-11-10 17:11:07 ========================================================== user  stan started matchmaking ================================================================================ matchmaking : user stan joined user 20 resumed matchmakingactivity = 2016-11-10 17:11:08 ========================================================== pong not logged ================================================================================ ================================================================================ = 2016-11-10 17:11:08 ========================================================== pong kejjimourad ================================================================================ = 2016-11-10 17:11:09 ========================================================== pong not logged ================================================================================ matched players kijey , stan trystartgame 5-5 areyouready [ 274, 20 ] matched 1 in 1 round = 2016-11-10 17:11:10 ========================================================== pong not logged ================================================================================ = 2016-11-10 17:11:10 ========================================================== notification sent { success: true,   data: [object] } ================================================================================ = 2016-11-10 17:11:10 ========================================================== notification sent { success: true,   data:    { multicast_id: 8703116803504844000,      success: 1,      failure: 0,      canonical_ids: 0,      results: [ [object] ] } } ================================================================================ = 2016-11-10 17:11:10 ========================================================== pong kejjimourad ================================================================================ = 2016-11-10 17:11:11 ========================================================== pong stan ================================================================================

i wish ommit lines contain "pong" (and if possible 1 line above , 1 line under) have relevant information, ie :

= 2016-11-10 17:11:07 ========================================================== matchmaking { id: '20',   email: 'stanley@beatme.io',   gender: 'male',   fbid: '167198360375634',   console: '5',   game: '5',   beatmeid: 'stan',   fairplay: 100,   victories: 32,   wallet: 11950 } ================================================================================ = 2016-11-10 17:11:07 ========================================================== user  stan started matchmaking ================================================================================ matchmaking : user stan joined user 20 resumed matchmakingactivity matched players kijey , stan trystartgame 5-5 areyouready [ 274, 20 ] matched 1 in 1 round = 2016-11-10 17:11:10 ========================================================== notification sent { success: true,   data: [object] } ================================================================================ = 2016-11-10 17:11:10 ========================================================== notification sent { success: true,   data:    { multicast_id: 8703116803504844000,      success: 1,      failure: 0,      canonical_ids: 0,      results: [ [object] ] } } ================================================================================


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