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Using OpenSSL what does “unable to write 'random state'” mean?
I'm generating a self-signed SSL certificate to protect my server's admin section, and I keep getting this message from OpenSSL:
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How do I drop a MongoDB database from the command line?
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If you want to get a human readable result, do it this way: mongo <dbname> --eval "printjson(db.dropDatabase())"
– Dmytro Uhnichenko
Sep 7 '14 at 11:23
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Restrict varchar() column to specific values?
Is there a way to specify, for example 4 distinct values for a varchar column in MS SQL Server 2008?
4 Answers
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Convert Base64 string to an image file? [duplicate]
...ase64_string, $output_file) {
// open the output file for writing
$ifp = fopen( $output_file, 'wb' );
// split the string on commas
// $data[ 0 ] == "data:image/png;base64"
// $data[ 1 ] == <actual base64 string>
$data = explode( ',', $base64_string );
// we coul...
How can I get file extensions with JavaScript?
...is takes care of .file (Unix hidden, I believe) kind of files too. That is if you want to keep it as a one-liner, which is a bit messy to my taste.
– kooker
Jun 21 '14 at 4:00
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Structs in Javascript
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The only difference between object literals and constructed objects are the properties inherited from the prototype.
var o = {
'a': 3, 'b': 4,
'doStuff': function() {
alert(this.a + this.b);
}
};
o.doStuff(); // displays: 7
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uppercase first character in a variable with bash
...n) and it uses two substitutions compared to the best scored answer's one. If you absolutely must write legacy code, consider using a function instead of a subshell.
– Steve
Apr 13 '16 at 23:57
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Vim Regex Capture Groups [bau -> byau : ceu -> cyeu]
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If you don't want to escape the capturing groups with backslashes (this is what you've missed), prepend \v to turn Vim's regular expression engine into very magic mode:
:%s/\v(\w)(\w\w)/\1y\2/g
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list.clear() vs list = new ArrayList(); [duplicate]
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It's hard to know without a benchmark, but if you have lots of items in your ArrayList and the average size is lower, it might be faster to make a new ArrayList.
http://www.docjar.com/html/api/java/util/ArrayList.java.html
public void clear() {
modCount++;
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Using curl to upload POST data with files
...t only send data parameters in HTTP POST but to also upload files with specific form name. How should I go about doing that ?
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