Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!rutgers!mit-eddie!genrad!decvax!ima!bbn!aoa!chuckles
From: chuckles@aoa.UUCP (Charles Stern)
Newsgroups: comp.unix.questions
Subject: Re: A couple questions
Message-ID: <21@aoa.UUCP>
Date: Wed, 22-Apr-87 14:02:06 EST
Article-I.D.: aoa.21
Posted: Wed Apr 22 14:02:06 1987
Date-Received: Sat, 25-Apr-87 09:23:14 EST
References: <3164@jade.BERKELEY.EDU> <2382@ncoast.UUCP>
Reply-To: chuckles@aoa.UUCP (Charles Stern)
Followup-To: <2382@ncoast.UUCP>
Organization: Adaptive Optics Assoc., Cambridge, Mass. USA
Lines: 44
Summary: Not truly correct...

In article <2382@ncoast.UUCP> robertd@ncoast.UUCP (Rob DeMarco) writes:

>>Hello!  I've a couple of questions in UNIX 4.2.
>>
>>1.  How do programs like "more" distinguish between text files and
>>	executable files?  Hopefully, there's something surer than
>>	just taking a sample of a file and testing it.  (This question
>>	came up when a bunch of people started accidentally sending
>>	executables to a line printer, and I was trying to figure
>>	out a way to filter out the execs from the texts).
>
>   I would believe that a pretty sure
>method would be to test the file
>permisions, if an "x" accours in the
>file permisions, then it is executable,
>other wise its text.

This is not truly accurate.  Consider the case of an executable shell script...
more SURELY works on that! (thank G-d ;-))


>>Thanks for your time,
>   Your welcome!   :-)
>>							Marc M. Pack
>
>
>-- 
>[=====================================]
>[             Rob DeMarco             ]
>[ UUCP:decvax!cwruecmp!ncoast!robertd ]
>[                                     ]
>[ "bus error - passengers dumped"     ]
>[=====================================]

-- 

	Charles Stern
	...!{decvax,linus,ima,ihnp4}!bbncca!aoa!chuckles
	...!{wjh12,mit-vax}!biomed!aoa!chuckles

 "What's black and dangerous and sits in a tree?"
 "A crow with a machine gun."
  -- "Star Smashers of the Galaxy Rangers"
         Harry Harrison