 use ‘-’ as a filename argument.

     -F, --separator separator
             Use the specified string as the separator between the filename
             and the file result returned. Defaults to ‘:’.

     -h, --no-dereference
             option causes symlinks not to be followed (on systems that sup‐
             port symbolic links). This is the default if the environment
             variable POSIXLY_CORRECT is not defined.

     -i, --mime
             Causes the file command to output mime 