pty

           $ file -i file.c file /dev/{wd0a,hda}
           file.c:      text/x-c
           file:        application/x-executable
           /dev/hda:    application/x-not-regular-file
           /dev/wd0a:   application/x-not-regular-file
</pre>
<p><strong>HISTORY</strong>
</p><pre>
     There has been a file command in every UNIX since at least Research
     Version 4 (man page dated November, 1973).  The System V version intro‐
     duced one significant major change: the external list of magic t