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RVM: Uninstalling all gems of a gemset
I have global gems and various gemsets. I want to remove all gems of a gemset. Is there a way do to this, besides uninstalling the gemset?
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Visual Studio replace tab with 4 spaces?
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What about tab size and indent size?
– Magallo
Apr 21 '15 at 10:24
3
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URL: Username with @
To send username and password with a URL, we use this scheme:
3 Answers
3
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DROP IF EXISTS VS DROP?
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Standard SQL syntax is
DROP TABLE table_name;
IF EXISTS is not standard; different platforms might support it with different syntax, or not support it at all. In PostgreSQL, the syntax is
DROP TABLE IF EXISTS table_name;
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Cause of a process being a deadlock victim
...L database engine. At the same time we have another process doing updates and inserts into the same database and same tables. The first process has started, recently to end prematurely with a message
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Creating JS object with Object.create(null)?
...= Object.prototype while Object.create(null) doesn't inherit from anything and thus has no properties at all.
In other words: A javascript object inherits from Object by default, unless you explicitly create it with null as its prototype, like: Object.create(null).
{} would instead be equivalent t...
composer: How to find the exact version of a package?
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composer.phar show
Will show all the currently installed packages and their version information. (This was shown in previous versions of Composer only when using the now-deprecated -i option.)
To see more details, specify the name of the package as well:
composer.phar show monolog/monolo...
PostgreSQL disable more output
...t, run it with -q or set QUIET=1 in the environment.
To produce results and throw them away you can redirect stdout to /dev/null with:
psql db -f sql.sql >/dev/null
You can redirect both stdout and stderr with:
psql db -f sql.sql >&/dev/null
but I don't recommend that, as it'll th...
.NET List Concat vs AddRange
What is the difference between the AddRange and Concat functions on a generic List? Is one recommended over the other?
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Generating a list of which files changed between hg versions
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hg status --rev x:y
where x and y are desired revision numbers (or tag or branch names).
If you are using the terminal in windows add hg status --rev x:y> your-file.txt to save the list to a file.
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