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iterations for even/odd selection
i=0; FILES=$(ls -tr ./); for FILE in $FILES; do i=$(($i + 1)); if [$(($i % 2)) = 0]; then echo"$i$FILE"; fi; done;
outputs:
==>
-bash: [0: command not found
-bash: [1: command not found
-bash: [0: command not found
...
...
...
<==
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