How to lookup the meaning of exit codes for Linux command line utilities?

Question

I have my prompt (bash) configured to print out the exit code from the last command, if it wasn\'t successful (aka not zero). Therefore I\'m seeing a lot of exit codes, even

Answer 1

The advanced Bash scripting guide also provides exit codes with special meanings.

http://tldp.org/LDP/abs/html/exitcodes.html#EXITCODESREF