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How to run cron job every 2 hours
...into crontab :
crontab -e
write this into the file:
0 */2 * * * python/php/java yourfilepath
Example :0 */2 * * * python ec2-user/home/demo.py
and make sure you have keep one blank line after the last cron job in your crontab file
...
Check if a program exists from a Makefile
...some of the existing solutions here...
REQUIRED_BINS := composer npm node php npm-shrinkwrap
$(foreach bin,$(REQUIRED_BINS),\
$(if $(shell command -v $(bin) 2> /dev/null),$(info Found `$(bin)`),$(error Please install `$(bin)`)))
The $(info ...) you can exclude if you want this to be quiete...
Correct way to convert size in bytes to KB, MB, GB in JavaScript
I got this code to covert size in bytes via PHP.
17 Answers
17
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Performance optimization strategies of last resort [closed]
... clear on a load op. Find places where floats, vectors, and ints are being cast to one another and eliminate them. Use __restrict liberally to promise the compiler about aliasing.
Microcoded operations. Most processors have some operations that cannot be pipelined, but instead run a tiny subroutine ...
Good Free Alternative To MS Access [closed]
...sktop application). If you think about the web-enabled frontend - consider PHP (with MySQL or PostgreSQL on the backend) or ASP.NET (with MSSQL Server at the backend).
I strongly recommend you not to use C++ for such job. This language is very efficient and flexible, but advanced database frontend ...
What is the maximum length of data I can put in a BLOB column in MySQL?
...t be accurate, but according to this site: http://www.htmlite.com/mysql003.php.
BLOB A string with a maximum length of 65535 characters.
The MySQL manual says:
The maximum size of a BLOB or TEXT
object is determined by its type, but
the largest value you actually can
transmit betwe...
Detecting iOS / Android Operating system
...
You can also Achieve this with user agent on php:
$userAgent = strtolower($_SERVER['HTTP_USER_AGENT']);
if(stripos($userAgent,'android') !== false) { // && stripos($userAgent,'mobile') !== false) {
header('Location: http://oursite.com/download/yourApp.apk');...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
... blame the compiler for it's complacency though. While gcc does have a -Wcast-align option, it isn't enabled by default nor with -Wall or -Wextra. This is apparently due to gcc developers considering this type of code to be a brain-dead "abomination" unworthy of addressing -- understandable disda...
node.js database [closed]
... think going with a newer stack like node.js (vs traditional frameworks in php/java) is adding enough "new" complexity that one shouldn't add extra layers all at once. This is a good article that discusses that:
http://nodeguide.com/convincing_the_boss.html
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How do I make an html link look like a button?
... This was dropped from the CSS3 spec. htmlvalidator.com/help.php?m=1&h=appearance
– user1431356
May 8 '18 at 23:37
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