Use Handler Numbers with <, >, >>
How to use input and output stream handler numbers with <, >, and >> redirections?
When <, >, and >> redirections are used without handler numbers, a default input or output stream is used as described below:
< Redirects handler 0 (STDIN) > Redirects handler 1 (STDOUT) >> Redirects handler 1 (STDOUT) as append
But you can change the default handler number by providing the handler number before the redirection operator. For example:
0< Redirects handler 0 (STDIN) 1> Redirects handler 1 (STDOUT) 2> Redirects handler 2 (STDERR) 1>> Redirects handler 1 (STDOUT) as append 2>> Redirects handler 2 (STDERR) as append
For example, the "dir junk" command writes current directory information to handler 1 (STDOUT) and an error message to handler 2 (STDERR). By default, both handlers 1 and 2 are mapped to the screen:
C:\fyicenter>dir junk Directory of C:\fyicenter (Info from handler 1 (STDIN) File Not Found (Error from handler 2 (STDERR)
But you can redirect them separately as shown below:
C:\fyicenter>dir junk 1> info.txt 2>error.txt C:\fyicenter>type info.txt Directory of C:\fyicenter C:\fyicenter>type error.txt File Not Found
2021-05-15, 1870👍, 0💬
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