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Re: [Bug-ed] ed -p flag

From: John Cowan
Subject: Re: [Bug-ed] ed -p flag
Date: Thu, 13 Oct 2011 10:27:55 -0400
User-agent: Mutt/1.5.18 (2008-05-17)

Antonio Diaz Diaz scripsit:

> Richard Hum wrote:
>> For some reason, the -p flag for ed requires a non-empty arguement. Is
>> this really necessary?
> Of course it isn't really necessary, but it is documented[1][2][3] this  
> way and so I have maintained it this way.

Your references merely require that -p take an argument: they do not
require the argument to be non-empty.  So whereas the command

$ ed -p

fails and should fail, the command

$ ed -p ''

should not fail, but it does, at least in ed 1.5.

LEAR: Dost thou call me fool, boy?      John Cowan
FOOL: All thy other titles              http://www.ccil.org/~cowan
             thou hast given away:      address@hidden
      That thou wast born with.

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