bash - return to position in array after exit -

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apparently wasn't clear when last asked this, i'll try again.

i have array full of values, lets call them primenumbers.txt

i have bash script lets call primechecker

the script take each , every value , in array , 1 @ time , run through. want able stop primechecker @ point in processing array; lets call x , restart script in way start position in array x+1.

if there further clarification need please let me know.

could store current index in file in /tmp , check file on startup:

for in nums;   echo $i > /tmp/marker   ... done

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