Created
April 20, 2020 12:47
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| D=hello | |
| [[ -z "${D}" ]] && echo '$D is blank or is set' || echo '$D set' "$D" | |
| $D set hello | |
| unset D | |
| [[ -z "${D}" ]] && echo '$D is blank or is set' || echo '$D set:' "$D" | |
| $D is blank or is set | |
| D= | |
| [[ -z "${D}" ]] && echo '$D is blank or is set' || echo '$D set:' "$D" | |
| $D is blank or is set |
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