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Query EC2 tags from within instance
...NCE_ID" --output=text | sed -r 's/TAGS\t(.*)\t.*\t.*\t(.*)/\1="\2"/' > /etc/ec2-tags
You need the AWS CLI tools installed on your system: you can either install them with a packages section in a cloud-config file before the script, use an AMI that already includes them, or add an apt or yum com...
Is PowerShell ready to replace my Cygwin shell on Windows? [closed]
...n PowerShell, or just stick with Cygwin /Perl scripts/Unix shell scripts, etc.
18 Answers
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How to edit multi-gigabyte text files? Vim doesn't work =( [closed]
...ndle large files pretty well. I just edited a 3.4GB file, deleting lines, etc. Three things to keep in mind:
Press Ctrl-C: Vim tries to read in the whole file initially, to do things like syntax highlighting and number of lines in file, etc. Ctrl-C will cancel this enumeration (and the syntax ...
Finding current executable's path without /proc/self/exe
... SunOS, Solaris, SYSV, HPUX, Concentrix, SCO, Darwin, AIX, OS X, Nextstep, etc. And with a little modification probably VMS, VM/CMS, DOS/Windows, ReactOS, OS/2, etc. If a program was launched directly from a GUI environment, it should have set argv[0] to an absolute path.
Understand that almos...
What is the difference between require and require-dev sections in composer.json?
...oding style issues)
phpunit/phpunit (to drive the development using tests)
etc.
Deployment
Now, in development and testing environments, you would typically run
$ composer install
to install both production and development dependencies.
However, in staging and production environments, you onl...
Are the PUT, DELETE, HEAD, etc methods available in most web browsers?
I've seen a couple questions around here like How to debug RESTful services , which mentions:
7 Answers
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Why use AJAX when WebSockets is available?
...tive games, dynamic media streams, bridging to existing network protocols, etc).
However, there is certainly an overlap in purpose between WebSockets and AJAX/Comet. For example, when the browser wants to be notified of server events (i.e. push) then Comet techniques and WebSockets are certainly bo...
SQL JOIN and different types of JOINs
...Note that a JOIN without any other JOIN keywords (like INNER, OUTER, LEFT, etc) is an INNER JOIN. In other words, JOIN is
a Syntactic sugar for INNER JOIN (see: Difference between JOIN and INNER JOIN).
2. OUTER JOIN :
OUTER JOIN retrieves
Either,
the matched rows from one table and all row...
Image width/height as an attribute or in CSS? [duplicate]
... would have to be redrawn for floated elements, specified padding, margins etc.
Whether to specify in html or css is best judged on individual circumstances. A large number of images of the same size would probably be best served with css, a single image with html. That said, if you are specifying ...
Finding local IP addresses using Python's stdlib
...s won't work always (returns 127.0.0.1 on machines having the hostname in /etc/hosts as 127.0.0.1), a paliative would be what gimel shows, use socket.getfqdn() instead. Of course your machine needs a resolvable hostname.
sha...