What does 2>&1 Do?

Can someone fully explain what this does...
 exec > $LogFile.cmd 2>&1
especially 2>&1.
We use Solaris, in bash  
Thanks
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snyderoAsked:
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mnewnhamCommented:
1 is the standard output file descriptor
2 is the standard error file descriptor

2>&1 means send standard error to the same place as standard output so

exec > $LogFile.cmd 2>&1 means

redirect any standard output to LogFile.cmd, and send anything from standard error there too.

Another classic example is:

command 1>/dev/null 2>&1
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snyderoAuthor Commented:
Thanks, what does >/dev/null represent?
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mnewnhamCommented:
/dev/null is the black hole down which you may throw anything without the possiblity of using up disk space (or indeed the possibility of retrieval).
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