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How to check the version before installing a package using apt-get?

...s-tools (= 2:2.8.4-2), adduser Filename: pool/universe/r/redis/redis-server_2.8.4-2_amd64.deb Size: 267446 MD5sum: 066f3ce93331b876b691df69d11b7e36 SHA1: f7ffbf228cc10aa6ff23ecc16f8c744928d7782e SHA256: 2d273574f134dc0d8d10d41b5eab54114dfcf8b716bad4e6d04ad8452fe1627d Description-en: Persistent key-v...
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Unable to create Android Virtual Device

...owing : Check if there exist a "default" folder in adt-bundle-windows-x86_64-20131030\sdk\system-images\android-17. If it exists then move the contents(downloaded system images) of the "default" folder to adt-bundle-windows-x86_64-20131030\sdk\system-images\android-17. Hope this helps. ...
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Easier way to create circle div than using an image?

... image is not circular..which is in mozilla. – techie_28 Jan 6 '12 at 15:19 1 @techie_28: The div...
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How to convert an Int to a String of a given length with leading zeros to align?

...this Q&A becomes the canonical compendium, scala> import java.text._ import java.text._ scala> NumberFormat.getIntegerInstance.asInstanceOf[DecimalFormat] res0: java.text.DecimalFormat = java.text.DecimalFormat@674dc scala> .applyPattern("0000000") scala> res0.format(123) res2: S...
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Port 80 is being used by SYSTEM (PID 4), what is that?

... W3SVC. Stop this service solves my problem. – daniel__ Aug 8 '13 at 22:41 22 Stopping and disabl...
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AngularJS : Prevent error $digest already in progress when calling $scope.$apply()

...l automatically have an apply run afterwards }); or if you have lodash: _.defer(function(){$scope.$apply();}); We tried several workarounds, and we hated injecting $rootScope into all of our controllers, directives, and even some factories. So, the $timeout and _.defer have been our favorite so...
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Is there a way to use shell_exec without waiting for the command to complete?

... How about adding. "> /dev/null 2>/dev/null &" shell_exec('php measurePerformance.php 47 844 email@yahoo.com > /dev/null 2>/dev/null &'); Note this also gets rid of the stdio and stderr. sh...
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How do I see what character set a MySQL database / table / column is?

...'d do it - For Schemas (or Databases - they are synonyms): SELECT default_character_set_name FROM information_schema.SCHEMATA WHERE schema_name = "schemaname"; For Tables: SELECT CCSA.character_set_name FROM information_schema.`TABLES` T, information_schema.`COLLATION_CHARACTER_SET_APPL...
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Checking if array is multidimensional or not?

...n' could be anywhere. If it has to be in the first item, you'd just do is_array($arr[0]); But, the most efficient general way I could find is to use a foreach loop on the array, shortcircuiting whenever a hit is found (at least the implicit loop is better than the straight for()): $ more multi....
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How can the Euclidean distance be calculated with NumPy?

...er too much if you use sqrt-sum with axis=0, linalg.norm with axis=0, or a_min_b = a - b numpy.sqrt(numpy.einsum('ij,ij->j', a_min_b, a_min_b)) which is, by a slight margin, the fastest variant. (That actually holds true for just one row as well.) The variants where you sum up over the second...