#!/bin/bash
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special=$'`!@#$%^&*()-_+={}|[]\\;\':",.<>?/ '
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for ((i=0; i < ${#special}; i++)); do
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char="${special:i:1}"
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printf -v q_char '%q' "$char"
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if [[ "$char" != "$q_char" ]]; then
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printf 'Yes - character %s needs to be escaped\n' "$char"
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else
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printf 'No - character %s does not need to be escaped\n' "$char"
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fi
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done | sort
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# Author: codeforester
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# https://stackoverflow.com/questions/15783701/which-characters-need-to-be-escaped-in-bash-how-do-we-know-it/44581064#44581064
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