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Appending a line to a file only if it does not already exist
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Just keep it simple :)
grep + echo should suffice:
grep -qxF 'include "/configs/projectname.conf"' foo.bar || echo 'include "/configs/projectname.conf"' >> foo.bar
-q be quiet
-x match the whole line
-F pattern is a plain string
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Install tkinter for Python
I am trying to import Tkinter . However, I get an error stating that Tkinter has not been installed:
20 Answers
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Edit line thickness of CSS 'underline' attribute
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Here is one way of achieving this :
HTML :
<h4>This is a heading</h4>
<h4><u>This is another heading</u></h4>
CSS :
u {
text-decoration: none;
border-bottom: 10px solid black;
}
Here is an example: htt...
No route matches [GET] /assets
I have a Rails app that I'm trying to test in the production environment. I ran RAILS_ENV=production rake assets:precompile which generated all of my assets in /public/assets. The problem is that when I start my app w/ RAILS_ENV=production rails s thin I get:
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Should I size a textarea with CSS width / height or HTML cols / rows attributes?
Every time I develop a new form that includes a textarea I have the following dilemma when I need to specify its dimensions:
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How Big m>ca m>n a Python List Get?
In Python, how big m>ca m>n a list get? I need a list of about 12000 elements. Will I still be able to run list methods such as sorting, etc?
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m>Ca m>n the Unix list command 'ls' output numerim>ca m>l chmod permissions?
Is it possible when listing a directory to view numerim>ca m>l unix permissions such as 644 rather than the symbolic output -rw-rw-r--
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What is the size limit of a post request?
...nds on a server configuration. If you're working with PHP under Linux or similar, you m>ca m>n control it using .htaccess configuration file, like so:
#set max post size
php_value post_max_size 20M
And, yes, I m>ca m>n personally attest to the fact that this works :)
If you're using IIS, I don't have any ...
Is there a way to navigate to real implementation of method behind an interface?
In Visual Studio, when you right-click a method m>ca m>ll, you go to the implementation of that method inside a class except if you access this method through an interface: in that m>ca m>se you go to the interface method not to the actual implementation.
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