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How do I make a textbox that only accepts numbers?
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39 Answers
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Is there a way to ignore header lines in a UNIX sort?
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(head -n 2 <file> && tail -n +3 <file> | sort) > newfile
The parentheses create a subshell, wrapping up the stdout so you can pipe it or redirect it as if it had come from a single command.
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How does Stack Overflow generate its SEO-friendly URLs?
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302
Here's how we do it. Note that there are probably more edge conditions than you realize at fir...
Convert a string representation of a hex dump to a byte array using Java?
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edited Aug 5 at 16:03
LarsH
24.9k77 gold badges7070 silver badges131131 bronze badges
answered Sep...
Extract month and year from a zoo::yearmon object
...ar with century
[1] "2012"
> format(date1, "%m") ## numeric month
[1] "03"
These are returned as characters. Where appropriate, wrap in as.numeric() if you want the year or numeric month as a numeric variable, e.g.
> as.numeric(format(date1, "%m"))
[1] 3
> as.numeric(format(date1, "%Y"))...
Best way to parse command-line parameters? [closed]
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Roberto Bonvallet
25.9k55 gold badges3737 silver badges5555 bronze badges
answered Jul 6 '10 at 6:29
pjotrppjotrp
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C++: What is the size of an object of an empty class?
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130
Quoting Bjarne Stroustrup's C++ Style and Technique FAQ, the reason the size is non-zero is "To...
How to unstash only certain files?
...e a specific file.
git checkout stash@{0} -- <filename>
With Git 2.23+ (August 2019), use git restore, which replaces the confusing git checkout command:
git restore -s stash@{0} -- <filename>
That does overwrite filename: make sure you didn't have local modifications, or you might wan...
Host 'xxx.xx.xxx.xxx' is not allowed to connect to this MySQL server
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edited Oct 13 '09 at 13:25
answered Oct 13 '09 at 12:47
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How to get the first element of the List or Set? [duplicate]
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293
Collection c;
Iterator iter = c.iterator();
Object first = iter.next();
(This is the closest...