Created
October 4, 2016 14:26
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| : {$DEBUG:?} # returns 0 | |
| : exit 1 # returns 0 | |
| DEBUG="true" | |
| : {$DEBUG:?} # returns 0 | |
| echo ${DEBUG:?} # returns 0 and echoes: "true" | |
| unset DEBUG | |
| echo ${DEBUG:?} # returns 1 with message: "DEBUG: parameter null or not set" |
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