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Ruby exit codes
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| $ ruby -e 'exit' | |
| $ echo $? | |
| 0 | |
| $ ruby -e 'exit 1' | |
| $ echo $? | |
| 1 | |
| $ ruby -e 'abort "oh no"' | |
| oh no | |
| $ echo $? | |
| 1 | |
| $ ruby -e 'fail "oh no"' | |
| -e:1: oh no (RuntimeError) | |
| $ echo $? | |
| 1 |
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