On 11/23/14 20:02, Einfach Jemand wrote:
Am 23.11.2014 23:08, schrieb Daniel Dickman:
On Sun, Nov 23, 2014 at 4:43 PM, Jason McIntyre <j...@kerhand.co.uk> wrote:
On Sun, Nov 23, 2014 at 10:46:23AM +0100, Ezequiel Garz?n wrote:
Hello, everyone. I've noticed that in OpenBSD ed(1) doesn't mark the
end of each line with a '$' when the list command 'l' is invoked. Is
this a deliberate deviation from the POSIX standard? Is there any
rationale for it? It looks like this should help "print the addressed
lines unambiguously" when dealing with trailing spaces, no?
Thanks and cheers,
Ezequiel
i don't know, but i'd like to.
there is nothing in bin/ed/POSIX concerning `l', but commit history to
that file is not exactly inspiring.
there is nothing in the posix page for ed documenting whether this is
something recent. it's there in 2008, and in the 2013 update.
it would be good to know how other bsds behave, and whether the
behaviour is considered desireable. then we'd know if behaviour should
be changed, or whether a doc update is enough.
if i don;t get any concrete feedback on that, i'll update the doc.
anyone want to chip in?
jmc
Hi Jason, commenting out CFLAGS+=-DBACKWARDS and recompiling will show
the $ at the end of long lines.
bin/ed/README says:
BACKWARDS - for backwards compatibility
This hasn't changed since 1995. Anyone know what ed is supposed to be
backwards compatible with?
Hello,
probably "backwards" with regard to the pre-posix aera.
Apparently there was no exact or a different specification for the "l"
command of ed before IEEE P1003.2 Draft 11.1. (that document was closed
on July 19, 1991) Looking at IEEE P1003.2 Draft 11.2 [1] you will notice
that paragraph 4.20.7.3.14 "List Command" was added/changed in draft
11.1. Note the "1" at the right end of each line... and the document states
-- Quote--
This draft uses small numbers in the right margin in lieu of change bars. 2
``2'' denotes changes from Draft 11.1 to Draft 11.2. ``1''
denotes 2
changes from Draft 11 to Draft 11.1. All diff-marks prior to Draft
11.1 1
have been removed. Trivial informative (i.e., non-normative) changes and
purely editorial changes such as grammar, spelling, or cross references
are not diff-marked.
-- End Quote --
Does anyone have drafts earlier than 11.1 of IEEE P1003.2 so this could
be verified.
The manpage of ed from the sixth edition unix (V6 1975) [2]
does not mention the $ at the end of a line for the "l" command.
The ed reference in appendix 1 of my exemplar of "The Unix Programming
Environment" by Kernighan and Pike from 1984 does not mention the $ at
the end of a listed line either.
Looking at the X/Open CAE Specifications, Commands and Utilities,
Issue 4, Version 2 from September 1994 [3], the $ at the end of each
line for the ed "l" command is specified at page 290. Unfirtunately I
have no access to earlier versions of this document.
[1] http://www.nic.funet.fi/pub/doc/posix/p1003.2/d11.2/all
[2] http://roguelife.org/~fujita/COOKIES/HISTORY/V6/ed.1.html
[3] https://www2.opengroup.org/ogsys/catalog/c436
HTH
rru
I'm afraid I don't know ed well, but in response to Jason's query I can
confirm that ed in FreeBSD 10.1-RELEASE does print the "$" after issuing
the "l" command.
From the GNU ed manual[1]:
"(.,.)l
Prints the addressed lines unambiguously. The end of each line is
marked with a '$', and every '$' character within the text is printed
with a preceding backslash. The current address is set to the last line
printed."
[1] http://www.gnu.org/software/ed/manual/ed_manual.html
