Shell Programming and Scripting

139,080 8,398 2,608 -593,820
139,100 8,398 2,608 -594,540
139,120 8,398 2,608 -595,140
139,140 8,398 2,608 -595,740
139,160 8,398 2,608 -596,280
139,180 8,398 2,608 -596,760
139,200 8,398 2,608 -597,240
139,220 8,398 2,608 -597,660
139,240 8,398 2,608 -598,020
139,260 8,398 2,608 -598,320
139,280 8,398 2,608 -598,620
139,300 8,398 2,608 -598,800
139,320 8,398 2,608 -599,040
139,340 8,398 2,608 -599,160
139,360 8,398 2,608 -599,220
139,380 8,398 2,608 -599,280
139,400 8,398 2,608 -599,280
139,420 8,398 2,608 -599,280
139,440 8,398 2,608 -599,160
139,460 8,398 2,608 -599,040
139,480 8,398 2,608 -598,920
139,500 8,398 2,608 -598,680
139,520 8,398 2,608 -598,440
139,540 8,398 2,608 -598,140
139,560 8,398 2,608 -597,780
139,580 8,398 2,608 -597,300
139,600 8,398 2,608 -596,820
139,620 8,398 2,608 -596,280
139,640 8,398 2,608 -595,620
139,660 8,398 2,608 -594,960
139,680 8,398 2,608 -594,300
.........
149,160 8,398 2,608 -597,000
149,180 8,398 2,608 -597,540
149,200 8,398 2,608 -597,960
149,220 8,398 2,608 -598,380
149,240 8,398 2,608 -598,740
149,260 8,398 2,608 -599,100
149,280 8,398 2,608 -599,340
149,300 8,398 2,608 -599,580
149,320 8,398 2,608 -599,760
149,340 8,398 2,608 -599,940
149,360 8,398 2,608 -600,000
149,380 8,398 2,608 -600,060
149,400 8,398 2,608 -600,060
149,420 8,398 2,608 -600,000
149,440 8,398 2,608 -599,940
149,460 8,398 2,608 -599,820
149,480 8,398 2,608 -599,640
149,500 8,398 2,608 -599,460
149,520 8,398 2,608 -599,220
149,540 8,398 2,608 -598,860
149,560 8,398 2,608 -598,500
149,580 8,398 2,608 -598,080
149,600 8,398 2,608 -597,540
149,620 8,398 2,608 -597,000
149,640 8,398 2,608 -596,400
149,660 8,398 2,608 -595,740

awk '
function sign(X)        {return X>0?+1:X==0?0:-1
                        }
                {TMP=$4
                 sub(/,/, ".", TMP)
                 DELTA = sign (TMP-LastVal)
                }
DELTA != TREND  {print LastLine
                }
                {LastLine = $0
                 LastVal = TMP
                 TREND = DELTA
                }
' file
139,380 8,398 2,608 -599,280
139,420 8,398 2,608 -599,280
149,380 8,398 2,608 -600,060
149,400 8,398 2,608 -600,060