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The Ruby %r{ } expression
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%r{} is equivalent to the /.../ notation, but allows you to have '/' in your regexp without having to escape them:
%r{/home/user}
is equivalent to:
/\/home\/user/
This is only a syntax commodity, for legibility.
Edit:
Note that you can use almost any non-alphabet...
GIT merge error “commit is not possible because you have unmerged files”
...rrent branch. Git flagged it as a conflict, so I had to delete the file locally then git add the_file in order to commit the merge.
– Brendon Muir
Sep 15 '16 at 23:14
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Convert timedelta to total seconds
...ime.datetime.fromtimestamp(time.mktime(time.gmtime())) expression.
(1) If all you need is the difference between two instants in seconds, the very simple time.time() does the job.
(2) If you are using those timestamps for other purposes, you need to consider what you are doing, because the result ...
How to change a command line argument in Bash?
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You have to reset all arguments. To change e.g. $3:
$ set -- "${@:1:2}" "new" "${@:4}"
Basically you set all arguments to their current values, except for the one(s) that you want to change. set -- is also specified by POSIX 7.
The "${@:1:...
How to disable google translate from html in chrome
...translate" in order to pass HTML5 validation.
– Leo Galleguillos
May 18 '17 at 23:09
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Unpacking, extended unpacking and nested extended unpacking
...luating these "by hand," I'll suggest some simple substitution rules. Basically, you might find it easier to understand an expression if all the iterables are formatted in the same way.
For the purposes of unpacking only, the following substitutions are valid on the right side of the = (i.e. for rv...
Elastic Search: how to see the indexed data
...lore your ElasticSearch cluster is to use elasticsearch-head.
You can install it by doing:
cd elasticsearch/
./bin/plugin -install mobz/elasticsearch-head
Then (assuming ElasticSearch is already running on your local machine), open a browser window to:
http://localhost:9200/_plugin/head/
Alte...
Private vs Public in Cache-Control
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The only difference is that with Private you are not allowing proxies to cache the data that travels through them. In the end, it all boils down to the data contained in the pages/files you are sending.
For example, your ISP could have an invisible proxy between you and the In...
How does “304 Not Modified” work exactly?
...ating a date-modified or ETag for each version of each resource; this typically comes from the filesystem or a separate database column.
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How to make Sequelize use singular table names
I have an model called User but Sequelize looks for the table USERS whenever I am trying to save in the DB. Does anyone know how to set Sequelize to use singular table names? Thanks.
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