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1. useful_shopt_options.sh useful_shopt_options.sh

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   #!/bin/bash

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   # not shopt but in the same vein

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   bind 'set completion-ignore-case on'

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2. bash-if-operands.sh bash-if-operands.sh

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   # [[ -e FILE ]]	FILE exists.

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   # [[ -b FILE ]]	...and is a block-special file.

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   # [[ -c FILE ]]	...and is a character-special file.

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   # [[ -d FILE ]]	...and is a directory.

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   # [[ -f FILE ]]	...and is a regular file.