Meaning of exit status 1 returned by linux command

Question

What is meaning of exit status 1 returned by linux command? Like 127 exit status indicates \"command not found\".

I have visited http://linux.die.net/abs-guide/exitc

Answer 1

You can see the value of the exit status using man.

Giving an example below:

man ls

Now search for string exit

Adding screen shot below: