Increment the elements of an array by 1 (1 thru 1000)

Try the seq command

cmd=( $(seq 1 1000) )

arrays linux bash shell sh

If you are running bash you may take advantage of its features.

Try:

cmd=({1..1000})

arrays linux bash shell sh

You can say:

cmd=( $(seq 1000) )

in order to create the array.

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