Check the format of the magic file
files argument is invalid with -c ).
Run file on the filenames in
Do not follow symbolic links.
Test the file that is referenced by a symbolic link, rather than the link itself.
file as the magic file instead of /etc/magic.
Many file types are understood. Output lists each filename, followed by a brief classification such as:
ascii text c program text c-shell commands data empty iAPX 386 executable directory [
nt]roff, tbl, or eqn input text shell commands symbolic link to ../usr/etc/arp
List all files that are deemed to be troff/nroff input:
file * | grep roff