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Test whether string is a valid integer
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[[ $var =~ ^-?[0-9]+$ ]]
The ^ indicates the beginning of the input pattern
The - is a literal "-"
The ? means "0 or 1 of the preceding (-)"
The + means "1 or more of the preceding ([0-9])"
The $ indicates the end of the input pattern
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Pip freeze vs. pip list
...ecific format for pip to understand, which is
feedparser==5.1.3
wsgiref==0.1.2
django==1.4.2
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That is the "requirements format".
Here, django==1.4.2 implies install django version 1.4.2 (even though the latest is 1.6.x).
If you do not specify ==1.4.2, the latest version available would be in...
jQuery How to Get Element's Margin and Padding?
...ry - I can get an elements formatted total padding and margin etc ? i.e. 30px 30px 30px 30px or 30px 5px 15px 30px etc
8 A...
Alter MySQL table to add comments on columns
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answered Jan 29 '10 at 14:18
RufinusRufinus
23.5k66 gold badges5959 silver badges7878 bronze badges
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Convert unix time to readable date in pandas dataframe
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230
These appear to be seconds since epoch.
In [20]: df = DataFrame(data['values'])
In [21]: df.co...
How to escape braces (curly brackets) in a format string in .NET
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10 Answers
10
Active
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Passing route control with optional parameter after root in express?
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190
That would work depending on what client.get does when passed undefined as its first parameter.
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Why does HTML5 form-validation allow emails without a dot?
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Ali AlaviAli Alavi
1,9591414 silver badges2020 bronze badges
7
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How to inspect the return value of a function in GDB?
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return 42;
}
int main( int argc, char *v[] ) {
fun();
return 0;
}
You can debug it as such --
(gdb) r
Starting program: /usr/home/hark/a.out
Breakpoint 1, fun () at test.c:2
2 return 42;
(gdb) finish
Run till exit from #0 fun () at test.c:2
main () at test.c:7
7 ...
CSS transition effect makes image blurry / moves image 1px, in Chrome?
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2020 update
If you have issues with blurry images, be sure to check answers from below as well, especially the image-rendering CSS property.
For best practice accessibility and SEO wise you could replace the background imag...