redirecting the output of shell command to &- what does it mean

问题

I am new to shell scripting and having a doubt regarding the usage of &-

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

What does it do when it is executed as:

./demo.sh 0>&-

Thanks.

回答1:

It closes the file descriptor - standard input (0) in this case.

See also:

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

来源：https://stackoverflow.com/questions/38782395/redirecting-the-output-of-shell-command-to-what-does-it-mean