bash: Duplicate an input file descriptor.
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Take into account the main readme for this section. README first.
The contents of oneworld file is.
One nation under a groove
Open file descriptor 3 for input and read file oneworld.
$ exec 3< oneworld
Copy input file descriptor 3 to input file descriptor 4.
$ exec 4<&3
Confirm file descriptor 4 has a copy of file descriptor 3.
$ cat <&4 One nation under a groove
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