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How to “EXPIRE” the “HSET” child key in redis?
...d zset Redis objects under the hood. Usage example:
RMapCache<Integer, String> map = redisson.getMapCache('map');
map.put(1, 30, TimeUnit.DAYS); // this entry expires in 30 days
This approach is quite useful.
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Check free disk space for current partition in bash
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In my Red-Hat something, the format string should be %a*%s instead of %a*%S. I'm not sure if this is a difference or a typo.
– RnMss
Jun 27 '13 at 8:00
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Detect when an image fails to load in Javascript
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/**
* Tests image load.
* @param {String} url
* @returns {Promise}
*/
function testImageUrl(url) {
return new Promise(function(resolve, reject) {
var image = new Image();
image.addEventListener('load', resolve);
image.addEventListener('error',...
Improve INSERT-per-second performance of SQLite
...NSIENT for those inserts.
SQLITE_TRANSIENT will cause SQLite to copy the string data before returning.
SQLITE_STATIC tells it that the memory address you gave it will be valid until the query has been performed (which in this loop is always the case). This will save you several allocate, copy an...
Is there a command line utility for rendering GitHub flavored Markdown?
...equire 'github/markdown'
puts GitHub::Markdown.render_gfm('your markdown string')
in your Ruby code. You can wrap that easily in a script to turn it into a command line utility:
#!/usr/bin/env ruby
# render.rb
require 'github/markdown'
puts GitHub::Markdown.render_gfm File.read(ARGV[0])
Exe...
What is the alternative for ~ (user's home directory) on Windows command prompt?
...lder path names, since it wraps all of the arguments as if it was one long string. Which means just an initial quote also works, or completely without quotes also works.
All other stuff below may be ignored now, it is left for historical reasons - so I dont make the same mistakes again
old u...
How to write an XPath query to match two attributes?
...t;X>
<Y ATTRIB1=attrib1_value ATTRIB2=attrib2_value/>
</X>
string xPath="/" + X + "/" + Y +
"[@" + ATTRIB1 + "='" + attrib1_value + "']" +
"[@" + ATTRIB2 + "='" + attrib2_value + "']"
XPath Testbed:
http://www.whitebeam.org/library/guide/TechNotes/xpathtestbed.rhtm
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What exactly does an #if 0 … #endif block do?
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@Dennis, I get foo.c:3: unterminated string or character constant from gcc, what're you using?
– David X
May 22 '10 at 2:29
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Count number of lines in a git repository
... diff --shortstat `git hash-object -t tree /dev/null`
It will give you a string like 1770 files changed, 166776 insertions(+).
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Preventing form resubmission
... won't trigger the confirmation alert popup if it gets a GET method (query string) in the url.
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