Antonio Diaz Diaz wrote:
> Changes in this version:
>
> * The "z" command has been fixed. ("zN" printed N + 1 lines). This bug was
> present since at least ed-0.2.
This bug exists in the *BSD ed’s as well, unfortunately.
Though documented otherwise in the ed man page (ed.1), the intent of the
command `zN’ is to set the window size to N, which is persistent (unlike with
ex(vim)). If the command prompt is counted as one line, then it should really
display only N - 1 lines from the buffer. In your current implementation
(1.11rc1), on an N line display, only N - 2 lines of the buffer are displayed -
the top line being the previous command. To verify this:
$ ed
r !seq 100
! <<<< Per POSIX, bang should be printed on return from shell
command.
292
1z
On the other hand, you’re in good company: ex(vim) exhibits this (mis)behavior
too. And since the
command `z' is explicitly omitted from SUSv4, you pretty much have a free hand
to define the behavior as you wish. Then again, ex(vim) properly documents the
command `zN' as setting the window height, indicating that the current behavior
in ex(vim) is probably a bug...
-AM
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