The retina display has 326 dpi resolution.It has sharp and slick screens around.When kept at a distance of 10-12 inch human eye can distinguish only upto 300 dpi.The retina desplay is used in iPhone4.The iPhone 4 screen provides 326 pixels.This has good resolution of 960x640 packed in 3.5 inch screen.These pixels are squeezed between two glossy aluminium nosilicate glass which is used in helicopter and high speed train wind-shields.
Sometimes we may need to get records count from file . For that we can use wc -l , command with file name. In some situation the file will be in compressed format . wc -l will not directly work with zipped files . In this case we can do zcat the file and pipe the word count command with it. Example : Let say we have a file cricketData.dat.gz To get word count from the file use : zcat cricketData.dat.gz | wc -l This will give the record count.
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