more specifically, to split into 5 ~equal files you can use the following construction in bash 
split -l$(expr $(expr $(wc -l filename |cut -d\  -f1) / 5) + 1) filena
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In reply to Re^2: split a file into number of file based on line count by Utilitarian
in thread split a file into number of file based on line count by asha80

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