IO Redirection

>& and > and >> and < are called redirection operators.

\>& : merges std streams.

> : redirects stdout of stderr stream into a file.

>> : appends stdout or stderr stream to a file.

< : redirects the contents of a file in place of stdin,
it replace what would normally come from a keyboard.

Examples: 
          2>&1 : merges stderr into stdout 
	         (useful when stderr goes to /dev/null).

	  1>A  : writes stdout into file A.

> ls  -d -l a* b* thisFileDoesNotExist

ls: thisFileDoesNotExist: No such file or directory
drwxr-x---    2 felix    users         664 2002-09-26 10:24 ada
drwxr-x---    3 felix    users        2184 2002-10-05 13:45 bin

Try:
   ls  -d -l a* b* thisFileDoesNotExist 2>ErrorLog
   ls  -d -l a* b* thisFileDoesNotExist 1>ErrorLog
   ls  -d -l a* b* thisFileDoesNotExist 1>>ErrorLog

   cat
   cat < ErrorLog