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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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How do I browse an old revision of a Subversion repository through the web view?
...Bert Huijben's comment:
If your repository is hosted using Subversion 1.6.0 or later, you can
use example.com/svnrepository/?p=3 for the same result... This method
/is/ documented. (?r= revision of the file, ?p= operational revision
of the URL). See the subversion 1.6 release notes
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How do I apply a perspective transform to a UIView?
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330
As Ben said, you'll need to work with the UIView's layer, using a CATransform3D to perform the l...
Meaning of $? (dollar question mark) in shell scripts
...executed command.
For example the command true always returns a status of 0 and false always returns a status of 1:
true
echo $? # echoes 0
false
echo $? # echoes 1
From the manual: (acessible by calling man bash in your shell)
$? Expands to the exit status of the most recen...
Easiest way to open a download window without navigating away from the page
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109
7 years have passed and
I don't know whether it works for IE6 or not, but this prompts OpenFile...
Easiest way to copy a single file from host to Vagrant guest?
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108
Instead of using a shell provisioner to copy the file, you can also use a Vagrant file provisio...
Rounding a double to turn it into an int (java)
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Drupad Panchal
38333 silver badges1010 bronze badges
answered Apr 16 '10 at 17:13
Mihir MathuriaMihir Mathuria
6,...
jquery how to empty input field
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answered Feb 10 '12 at 23:36
shaunsantacruzshaunsantacruz
8,14433 gold badges1616 silver badges1818 bronze badges
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Check if a string matches a regex in Bash script
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330
You can use the test construct, [[ ]], along with the regular expression match operator, =~, to ...
How do I upload a file with metadata using a REST web service?
...": 52.12873
}
To create the metadata entry and return a response like:
201 Created
Location: http://server/data/media/21323
{
"Name": "Test",
"Latitude": 12.59817,
"Longitude": 52.12873,
"ContentUrl": "http://server/data/media/21323/content"
}
The client can then use this Conten...