Overview
The exec command replaces the current process with a command, but when used without arguments, it allows for dynamic changes to redirection.
This was prompted by the code that appeared when confirming at the prompt during direct push to master:
#!/bin/sh
eval < /dev/tty
read ANSWER
I didn't quite understand it, so I looked it up.
Usage
#!/bin/sh
echo "Output to stdout" // Standard input
exec > redirect.txt // Change file descriptor
echo "Output to file" // Output to file
The code that appeared during direct push to master is:
#!/bin/sh
exec < /dev/tty
read ANSWER
This passes the input from the current terminal (/dev/tty) to the standard input of the exec command. (It's a bit confusing...)
Thoughts
It seems useful when you can't read from standard input for some reason.
