Once I have octal dumped a file, how can I reverse this process?
I have found several other questions related to this but in all of those cases the choice of flags for the od command causes the result to contains hexadecimal characters. Many of them appear to be using the xxd -r command to reverse it but even after reading the manual I cannot seem to get it to work with octal.
POSIX compliance would be quite nice but is not strictly required. I'm trying to avoid dependencies if possible for portability.
I am essentially trying to do the following:
$ cat hello.txt
Hello World!
$ od hello.txt
0000000 062510 066154 020157 067527 066162 020544 000012
0000015
$ od hello.txt | something_goes_here
Hello World!