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[Redhat] KornShell query



Title: [Redhat] KornShell query

Hai friends,
I have couple of  doubts on korn shell..

1. what is the meaning of $?  in ksh.

For example
In ksh I wrote a script to replace a temporary sql table (say  sbc_temp) in to a permenant table (abc_perm). For that I have  given the code as below

replaceTable abc_perm  abc_temp
unixReturnCheck $?

In the above statement what is the purpose of using $?

2. when I read some document on ksh I have come across "exit 16"  at the end of if statement. what this exit 16 indicates? Is there  any other code are there in ksh like exit 16?


Thanks and rgds,
Prasad Rao.

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