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arraysbasharithmetic-expressions

Bash - arithmetic in array index

Say I have an array arr and an index x. How do I assign something to the array at index x+1? I'm getting bugs by trying the following, if one of them is correct I'd love to know which one and if not what am I doing wrong?

arr[$x+1]="hi"      # Doesn't work
arr[$((x+1))]="hi"  # Nope
Solution

  • Almost there.

    arr[(($x+1))]="hi"