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Set environment variables on Mac OS X Lion
... me. I have no idea where these files are, how to create them if I have to do that, etc, and also why there seem to be so many different ones (why? Do they do different things?)
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MySQL: Insert record if not exists in table
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I'm not actually suggesting that you do this, as the UNIQUE index as suggested by Piskvor and others is a far better way to do it, but you can actually do what you were attempting:
CREATE TABLE `table_listnames` (
`id` int(11) NOT NULL auto_increment,
`name...
Determining if a number is either a multiple of ten or within a particular set of ranges
I have a few loops that I need in my program. I can write out the pseudo code, but I'm not entirely sure how to write them logically.
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How do I 'svn add' all unversioned files to SVN?
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also you could probably dig up sed and grep on windows if you really wanted.
– Sam Saffron
Jul 2 '09 at 5:13
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Constants in Objective-C
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Overall, great answer, with one glaring caveat: you DO NOT want to test for string equality with the == operator in Objective-C, since it tests memory address. Always use -isEqualToString: for this. You can easily get a different instance by comparing MyFirstConstant and [NSSt...
Open new Terminal Tab from command line (Mac OS X)
... "System Events" to tell process "Terminal" to keystroke "t" using command down'
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CoffeeScript, When to use fat arrow (=>) over arrow (->) and vice versa
... problems passing a reference to an instance's method as a callback if you don't use the fat-arrow. This is because the fat-arrow binds the instance of the object to this whereas the thin-arrow doesn't, so thin-arrow methods called as callbacks as above can't access the instance's fields like @msg o...
Why do we use Base64?
...t the case.
Originally a lot of different encodings were created (e.g. Baudot code) which used a different number of bits per character until eventually ASCII became a standard with 7 bits per character. However most computers store binary data in bytes consisting of 8 bits each so ASCII is unsuita...
How do you iterate through every file/directory recursively in standard C++?
How do you iterate through every file/directory recursively in standard C++?
16 Answers
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How to check if an email address exists without sending an email?
...PT, and see if the mail is rejected.
MAIL FROM:<>
RCPT TO:<user@domain>
If the user doesn't exist, you'll get a 5.1.1 DSN. However, just because the email is not rejected, does not mean the user exists. Some server will silently discard requests like this to prevent enumeration of t...