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Run task only if host does not belong to a group
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You can set a control variable in vars files located in group_vars/ or directly in hosts file like this:
[vagrant:vars]
test_var=true
[location-1]
192.168.33.10 hostname=apollo
[location-2]
192.168.33.20 hostname=zeus
[vagrant:children]
location-1
location-2
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Why does AuthorizeAttribute redirect to the login page for authentication and authorization failures
... all around.
Consider most operating systems - when you attempt to read a file you don't have permission to access, you aren't shown a login screen!
Thankfully, the HTTP specifications were updated (June 2014) to remove the ambiguity.
From "Hyper Text Transport Protocol (HTTP/1.1): Authenticati...
Script parameters in Bash
... var1=${!i};
elif [ ${!i} = "-log" ];
then ((i++))
logFile=${!i};
elif [ ${!i} = "-x" ];
then ((i++))
var2=${!i};
elif [ ${!i} = "-p" ];
then ((i++))
var3=${!i};
elif [ ${!i} = "-b" ];
then ((i++))
var4=${!i};
eli...
How do I change bash history completion to complete what's already on the line?
... Ubuntu ships with this useful /usr/share/doc/bash/inputrc.arrows:
# This file controls the behaviour of line input editing for
# programs that use the Gnu Readline library.
#
# Arrow keys in keypad mode
#
"\C-[OD" backward-char
"\C-[OC" forward-char
"\C-[OA" previous-history
"...
Requests — how to tell if you're getting a 404
...4')
>>> r.raise_for_status()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "requests/models.py", line 664, in raise_for_status
raise http_error
requests.exceptions.HTTPError: 404 Client Error: NOT FOUND
>>> r = requests.get('http://...
Automatically plot different colored lines
...x" at the bottom of this post.
There is a great tool on the MATLAB Central File Exchange to generate any number of visually distinct colors, if you have the Image Processing Toolbox to use it. Read on for details.
The ColorOrder axes property allows MATLAB to automatically cycle through a list ...
How to re-raise an exception in nested try/except blocks?
... raise err from None
>>> f()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 9, in f
File "<stdin>", line 3, in f
SyntaxError: None
>>>
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Using sed, how do you print the first 'N' characters of a line?
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colrm x
For example, if you need the first 100 characters:
cat file |colrm 101
It's been around for years and is in most linux's and bsd's (freebsd for sure), usually by default. I can't remember ever having to type apt-get install colrm.
...
How to style a JSON block in Github Wiki?
...oks.
The following screenshots are from the Gitlab in a markdown file.
This may vary based on the colors using for syntax in MARKDOWN files.
share
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improve this answer
|...
Can't use modulus on doubles?
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Use fmod() from <cmath>. If you do not want to include the C header file:
template<typename T, typename U>
constexpr double dmod (T x, U mod)
{
return !mod ? x : x - mod * static_cast<long long>(x / mod);
}
//Usage:
double z = dmod<double, unsigned int>(14.3, 4);
doubl...