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How can I get a precise time, for example in milliseconds in Objective-C?
...is answer was written in 2009. See Pavel Alexeev's answer for the simpler POSIX clock_gettime() interfaces available in newer versions of macOS and iOS.)
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bash: shortest way to get n-th column of output
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Because you seem to be unfamiliar with scripts, here is an example.
#!/bin/sh
# usage: svn st | x 2 | xargs rm
col=$1
shift
awk -v col="$col" '{print $col}' "${@--}"
If you save this in ~/bin/x and make sure ~/bin is in your PATH (now that is something you can ...
rvm installation not working: “RVM is not a function”
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You need to run the following
$ source ~/.rvm/scripts/rvm
then run this
$ type rvm | head -n 1
and if you get
rvm is a function
the problem is solved.
You also need to run user$ rvm requirements to see dependency requirements for your operating system
Source: h...
How do I pass command line arguments to a Node.js program?
...launch with a specific folder. I'm not sure how to access arguments in JavaScript. I'm running node like this:
33 Answers
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“Eliminate render-blocking CSS in above-the-fold content”
...rmance, and so far it's proven extremely successful. Things like deferring scripts worked beautifully, since I already had an in-house version of jQuery's .ready() to defer scripts until the page had loaded fully, all I had to do was inline that particular function and move the full scripts to the...
What is the difference between Cloud, Grid and Cluster? [closed]
...s to say that a cluster is tightly coupled, whereas a Grid or a cloud is loosely coupled. Also, clusters are made up of machines with similar hardware, whereas clouds and grids are made up of machines with possibly very different hardware configurations.
To know more about cloud computing, I recomm...
How do you version your database schema? [closed]
...n be rolled back without losing data or functionality.
I have a migration script that contains statements that creates tables and columns if they don't exist yet and fills them with data.
The migration script runs whenever the production code is updated and after new installs.
When I would like t...
Automating “enter” keypresses for bash script generating ssh keys
I would like to create script, which simply runs ssh-keygen -t rsa . But how to pass to it 3 times enter?
5 Answers
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MySQL connection not working: 2002 No such file or directory
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"The hostname localhost has a special meaning. It is bound to the use of Unix domain sockets. It is not possible to open a TCP/IP connection using the hostname localhost you must use 127.0.0.1 instead." - php.net/manual/en/mysqli.q...
How can I do test setup using the testing package in Go
... and
teardown is necessary around a call to m.Run. It should then call
os.Exit with the result of m.Run
It took me some time to figure out that this means that if a test contains a function func TestMain(m *testing.M) then this function will be called instead of running the test. And in this f...