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- [a][b][c][d][e]
- $ a=(a b c d e f)
- $ echo ${a[-1]}
- f
- $ echo ${a[${#a[@]}-1]}
- f
- $ a=([a] [b] [c] [d] [e])
- $ printf %s\n "${a[@]:(-1)}"
- $ printf %s\n "${a[@]: -1}"
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