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What's a concise way to check that environment variables are set in a Unix shell script?
...he Bourne Shell (1978 or thereabouts). The ${var:?} construct is slightly more recent: I think it was in System III UNIX circa 1981, but it may have been in PWB UNIX before that. It is therefore in the Korn Shell, and in the POSIX shells, including specifically Bash.
It is usually documented in th...
SQL parser library for Java [closed]
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Microsecond timing in JavaScript
...i7 system, I've been able to reliably get the exact same millisecond, over more than 1,000 attempts. Only when I'm trying to do things like load an extra web page, or other, the millisecond accuracy degrades (And I'm able to successfully catch my own degraded accuracy by doing a before-and-after ti...
Undefined, unspecified and implementation-defined behavior
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Error to use a section registered as allowDefinition='MachineToApplication' beyond application level
...configure the /portal/ folder as an application in IIS (which I have), and more posts telling me I have nested web.configs (but none of the postings offer guidance toward a solution).
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Validating IPv4 addresses with regexp
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How to get numbers after decimal point?
...proach. The answer I sought was the next answer, 5.55 % 1, which is also a more generally useful answer--one can use the modulo division approach in multiple languages, whereas the above answer is Python-specific.
– Stew
Feb 3 '15 at 20:17
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Django development IDE [closed]
...ango development, but it has all been in a text editor. I was curious what more advanced development tools others are using in their Django development.
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npm command to uninstall or prune unused packages in Node.js
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Generate fixed length Strings filled with whitespaces
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