Redirecting shell command output to & - what does it mean

Question

I am new to shell scripts and doubt using & -

I have a shell script with a single line: echo Hello. The shell script is calleddemo.sh

What does he do when he runs like:

./demo.sh 0>&-

Thank.

Answer 1

In this case, it closes the file descriptor - standard input (0).

See also:

• http://www.tldp.org/LDP/abs/html/io-redirection.html