val and var are two ways of declaring variables in Scala. val is immutable means it cannot be changed once declared.
var is mutable means it can be changed at a later point of time in the program .
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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