On unix the command line is parsed by the shell first, so your program only sees the "input.txt" part, and your perl code only has the file handle. A recent discussion in the
ChatterBox on the subject brought up the
lsof Unix command, but I wouldn't call it convenient, and usually needs root permissions.
Another possibilty is to use stat to get the Inode number and then search the filesystem for the corresponding file. I don't know if that works for multiple file-systems, though.
Can't you rewrite your program as taking 2 filenames as arguments? It seems the most convenient by far.
J.
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