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Save output of updated csv file as csv file itself, part 2

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Hi,

I have another problem. I want to sort another csv file by the first field.
result.csv
Code:

SourceFile,Airspeed,GPSLatitude,GPSLongitude,Temperature,Pressure,Altitude,Roll,Pitch,Yaw
/home/intannf/foto5/2015_0313_090651_219.JPG,0.,-7.77223,110.37310,30.75,996.46,148.75,180.94,182.00,63.92
/home/intannf/foto5/2015_0313_090323_155.JPG,0.,-7.77224,110.37312,30.73,996.46,148.76,181.01,181.92,63.82
/home/intannf/foto5/2015_0313_090142_124.JPG,0.,-7.77224,110.37312,30.73,996.46,148.75,181.13,182.06,63.87
/home/intannf/foto5/2015_0313_085929_083.JPG,0.,-7.77224,110.37312,30.72,996.46,148.74,180.93,182.12,63.64
/home/intannf/foto5/2015_0313_090710_225.JPG,0.,-7.77224,110.37312,30.72,996.46,148.77,181.09,181.86,63.78
/home/intannf/foto5/2015_0313_090628_212.JPG,0.,-7.77223,110.37310,30.72,996.47,148.67,181.09,181.91,63.87
/home/intannf/foto5/2015_0313_085942_087.JPG,0.,-7.77219,110.37317,30.76,996.47,148.71,181.12,182.17,63.78
/home/intannf/foto5/2015_0313_090717_227.JPG,0.,-7.77217,110.37315,30.77,996.48,148.66,181.06,182.21,63.87

Output required:
Code:

SourceFile,Airspeed,GPSLatitude,GPSLongitude,Temperature,Pressure,Altitude,Roll,Pitch,Yaw
/home/intannf/foto5/2015_0313_085929_083.JPG,0.,-7.77224,110.37312,30.72,996.46,148.74,180.93,182.12,63.64
/home/intannf/foto5/2015_0313_085942_087.JPG,0.,-7.77219,110.37317,30.76,996.47,148.71,181.12,182.17,63.78
/home/intannf/foto5/2015_0313_090142_124.JPG,0.,-7.77224,110.37312,30.73,996.46,148.75,181.13,182.06,63.87
/home/intannf/foto5/2015_0313_090323_155.JPG,0.,-7.77224,110.37312,30.73,996.46,148.76,181.01,181.92,63.82
/home/intannf/foto5/2015_0313_090628_212.JPG,0.,-7.77223,110.37310,30.72,996.47,148.67,181.09,181.91,63.87
/home/intannf/foto5/2015_0313_090651_219.JPG,0.,-7.77223,110.37310,30.75,996.46,148.75,180.94,182.00,63.92
/home/intannf/foto5/2015_0313_090710_225.JPG,0.,-7.77224,110.37312,30.72,996.46,148.77,181.09,181.86,63.78
/home/intannf/foto5/2015_0313_090717_227.JPG,0.,-7.77217,110.37315,30.77,996.48,148.66,181.06,182.21,63.87

I have tried to sort them by sort -n -k2.1,1 -o result.csv -t, result.csv and sort -k2.1,1 -o result.csv -t, result.csv. But what i got that the heading line is always writen below the data. Please help me to figure it out. Thanks in advance.

Regards,
Intan

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