Shell Programming and Scripting

To the best of my knowledge, you cannot go from a file descriptor to a pathname. I don't think you can even do that with C and access to the system call API.

One possible work around would be to pass the destination for the redirects as parameters to the script and then use the exec builtin to do the redirection. This way the script knows to where it should redirect and those paths can be written to a file.

I didn't quite understand exactly what you're up to, but perhaps that info may help.

Regards,
Alister

I also wanted to read the stdin/stdout/stderr redirection from within the script and solved it using lsof:

Code:

stdin=$(lsof -a -p $$ -d 0 |tail -n 1|sed -r 's/^[^\/]*(\/.*)$/\1/')
stdout=$(lsof -a -p $$ -d 1 |tail -n 1|sed -r 's/^[^\/]*(\/.*)$/\1/')
stderr=$(lsof -a -p $$ -d 2 |tail -n 1|sed -r 's/^[^\/]*(\/.*)$/\1/')

gwyn