logging

Swift: print() vs println() vs NSLog()

A few differences: print vs println:The print function prints messages in the Xcode console when debugging apps.The println is a variation of this that was removed in Swift 2 and is not used any more. If you see old code that is using println, you can now safely replace it with print.Back in Swift 1.x, print did not add newline characters at the end of … Read more

No handlers could be found for logger

For logging some message through logger, in Python at least one handler should be added to the logger object. By default the debug, warn and other functions in logging module will call basicConfig which in turn will add a StreamHandler to the root logger. It’s always recommended to add your required Handler to your logger … Read more

Configure Node.js to log to a file instead of the console

Update 2013 – This was written around Node v0.2 and v0.4; There are much better utilites now around logging. I highly recommend Winston Update Late 2013 – We still use winston, but now with a logger library to wrap the functionality around logging of custom objects and formatting. Here is a sample of our logger.js https://gist.github.com/rtgibbons/7354879 Should be as … Read more

Where does linux store my syslog?

On my Ubuntu machine, I can see the output at /var/log/syslog. On a RHEL/CentOS machine, the output is found in /var/log/messages. This is controlled by the rsyslog service, so if this is disabled for some reason you may need to start it with systemctl start rsyslog. As noted by others, your syslog() output would be logged by the /var/log/syslog file.You can see system, user, … Read more

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