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How do you create a read-only user in PostgreSQL?
I'd like to create a user in PostgreSQL that can only do SELECTs from a particular database. In MySQL the command would be:
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Why doesn't Java support unsigned ints?
...derstand what goes on with unsigned, what unsigned arithmetic is. Things like that made C complex. The language part of Java is, I think, pretty simple. The libraries you have to look up.
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How to convert a column number (e.g. 127) into an Excel column (e.g. AA)
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community wiki
Graham
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How can I start an interactive console for Perl?
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You can use the perl debugger on a trivial program, like so:
perl -de1
Alternatively there's Alexis Sukrieh's Perl Console application, but I haven't used it.
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Pipe output and capture exit status in Bash
...t.txt ; test ${PIPESTATUS[0]} -eq 0
Or another alternative which also works with other shells (like zsh) would be to enable pipefail:
set -o pipefail
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The first option does not work with zsh due to a little bit different syntax.
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How can I get the current user's username in Bash?
...variable=$(whoami)
or
myvariable=$USER
Of course, you don't need to make a variable since that is what the $USER variable is for.
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How do I compare two hashes?
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the Tin Manthe Tin Man
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How do I 'git diff' on a certain directory?
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Peter Mortensen
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answered Dec 5 '11 at 7:13
GeoGeo
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Serializing PHP object to JSON
...votes. If you're still using PHP < 5.4, your are creating a security risk and endagering your project. If you have no compelling reasons to stay at <5.4, or even already use version >= 5.4, do not use this answer, and just use PHP>= 5.4 (or, you know, a recent one) and implement the Json...
Specifying column name in a “references” migration
I want to make a migration in Rails, referencing another table. Usually, I would do something like:
6 Answers
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