Just editing a bash script and the last line is:
exec <&-
Hoping someone can explain. I'm guessing it has to do with the exit code of the previous command?
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exec <&- closes standard input (filedescriptor 0).
exec with just redirections but not other argument applies the redirections to the current process.
A redirection to or from &- means close.
With numerical descriptors it doesn't matter if you do 0<&- or 0>&- — either version will close filedescriptor 0 (standard input). If you ommit the number > redirection means "use fildescriptor 1and<` means "use filedescriptor 0".
Petr Skocik
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To make this answer more generally useful, could you add links to the relevant parts of https://www.gnu.org/software/bash/manual/bashref.html ? – ruakh May 07 '19 at 22:47
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@ruakh I have since added an explanation. I'm not referencing the reference page, but it's info on the `&-` redirection is easy to find by `/` searching either `man sh` or `man bash` (the feature is POSIX compliant -- extensions like those of bash aren't needed for it to work). – Petr Skocik May 07 '19 at 22:53