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How to resolve symbolic links in a shell script
...eferences to '/./', '/../' and extra '/' characters in the null terminated string named by path and
stores the canonicalized absolute pathname in the buffer of size PATH_MAX named by resolved_path. The resulting path will have no symbolic link, '/./' or
'/../' components.
...
How do I trim leading/trailing whitespace in a standard way?
...ferably standard method of trimming leading and trailing whitespace from a string in C? I'd roll my own, but I would think this is a common problem with an equally common solution.
...
Storing Data in MySQL as JSON
...QL 5.7.8, MySQL supports a native JSON type. JSON values are not stored as strings, instead using an internal binary format that permits quick read access to document elements. JSON documents stored in JSON columns are automatically validated whenever they are inserted or updated, with an invalid do...
PHP Session Fixation / Hijacking
...ed so it's not 100% reliable, but it's better than not.
Include the user's IP address from $_SERVER['REMOTE_ADDR'] in the session. Basically, when the session starts, store it in something like $_SESSION['remote_ip']. This may be problematic from some ISPs that use multiple IP addresses for their ...
How can I add reflection to a C++ application?
...); \
}\
const char * name() const \
{\
return BOOST_PP_STRINGIZE(STRIP(x)); \
} \
}; \
What this does is generate a constant fields_n that is number of reflectable fields in the class. Then it specializes the field_data for each field. It also friends the reflector class, t...
TCP vs UDP on video stream
...tivity; therefore TCP is more appropriate for replaying a video-on-demand.
IP multicast significantly reduces video bandwidth requirements for large audiences; TCP prevents the use of IP multicast, but UDP is well-suited for IP multicast.
Live video is normally a constant-bandwidth stream recorded o...
How to convert a char to a String?
I have a char and I need a String . How do I convert from one to the other?
12 Answers
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ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock'
...t';
-- MySQL 5.7, mysql.user table "password" field -> "authentication_string"
update user set authentication_string=password('mynewpassword') where user='root';
Flush the privileges
flush privileges;
Restart the server
quit
Stop and start the server again
Ubuntu and Debian:
sudo /etc/in...
Permission denied (publickey) when SSH Access to Amazon EC2 instance [closed]
...out which username you should use is often lacking from the AMI Image description. But you can find some in AWS EC2 documentation, bullet point 4. :
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AccessingInstancesLinux.html
Use the ssh command to connect to the instance. You'll specify the...
Difference between char* and const char*?
...
char* is a mutable pointer to a mutable character/string.
const char* is a mutable pointer to an immutable character/string. You cannot change the contents of the location(s) this pointer points to. Also, compilers are required to give error messages when you try to do so. ...