Caudium HOWTO
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6.6. How to print something to debug log file

With Caudium you can output something to the web page or to the debug log file located in ../logs/debug/default.* . This way the end-user will not see any line you can output in your debug log file. Sending output to the debug log file is simple, just write to stdout: 


write("my message to log file\n");
It is also usually useful to use sprintf to format what you want to output: 

int i = 2; write(sprintf("i=%d\n", i));
This line will output i=2 , but it is better when you output array or mapping, as Pike is able to print them in a human-comprehensible format: 

array a = ({ "test", "test2", 2 }); write(sprintf("a=%O\n", a));
Which will output: 

a = ({ /* 2 elements */
    "test",
    "test2"
})

Note

the %O format is very useful since it can output any type from int to mapping. The only type you can't format is object.

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