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HowTo: Iterate Bash For Loop Variable Range Under Unix / Linux

How can I iterate bash for loop using a variable range of numbers in Unix or Linux or BSD or Apple OS X operating systems?
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Bash C Style For Loop Example and Syntax

How do I use the bash C style for loop under UNIX or Linux operating systems?
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How To Find BASH Shell Array Length ( number of elements )

Q. How do I define array in a bash shell script? How do I find out bash array length (number of elements) while running a script using for shell loop?
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