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What generates the “text file busy” message in Unix?
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If trying to build phpredis on a Linux box you might need to give it time to complete modifying the file permissions, with a sleep command, before running the file:
chmod a+x /usr/bin/php/scripts/phpize \
&& sleep 1 \
&& /u...
Dynamically select data frame columns using $ and a character value
...is a reproducible example below:
# set seed for reproducibility
set.seed(123)
df <- data.frame( col1 = sample(5,10,repl=T) , col2 = sample(5,10,repl=T) , col3 = sample(5,10,repl=T) )
# We want to sort by 'col3' then by 'col1'
sort_list <- c("col3","col1")
# Use 'do.call' to call order. S...
How to convert an NSString into an NSNumber
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For strings starting with integers, e.g., @"123", @"456 ft", @"7.89", etc., use -[NSString integerValue].
So, @([@"12.8 lbs" integerValue]) is like doing [NSNumber numberWithInteger:12].
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Why are hexadecimal numbers prefixed with 0x?
...h is nicely divisible by 3 = log2(8).
The BCPL language used the syntax 8 1234 for octal numbers. When Ken Thompson created B from BCPL, he used the 0 prefix instead. This is great because
an integer constant now always consists of a single token,
the parser can still tell right away it's got a c...
Store password in TortoiseHg
...the name of your GC project. So something like:
default = https://fred:xyz123@fredproj.googlecode.com/hg/
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“Unsafe JavaScript attempt to access frame with URL…” error being continuously generated in Chrome w
...I think the best solution is to use Facebook's server-side solutions (e.g. PHP SDK), it'll save you a lot, lot, lot, lot, lot of headache. The only advantage I see in using the FB javascript SDK is the popup login which you can do yourself using javascript/jQuery.
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How can I refresh a page with jQuery?
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123
To reload a page with jQuery, do:
$.ajax({
url: "",
context: document.body,
succe...
Access parent URL from iframe
... your iFrame, say you want this iframe: src="http://www.example.com/mypage.php"
Well, instead of HTML to specify the iframe, use a javascript to build the HTML for your iframe, get the parent url through javascript "at build time", and send it as a url GET parameter in the querystring of your src t...
Detecting syllables in a word
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123
Read about the TeX approach to this problem for the purposes of hyphenation. Especially see Fr...
What is the “realm” in basic authentication
I'm setting up basic authentication on a php site and found this page on the php manual showing the set up. What does "realm" mean here in the header?
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