Re: Warn when editing read-only files

[Antonio Diaz Diaz]

Andrew L. Moore wrote:
> Antonio Diaz Diaz <antonio@gnu.org> writes:
> ] How do you propose to implement such a warning while remaining
> ] POSIX-compliant?
>
> In github.com/slewsys/ed this is implemented by reporting 'Read-only' if
> ed is in verbose mode:
>
> $ ed -v /etc/os-release
> /etc/os-release: File is read-only
> 735

I find it less intrusive what is already implemented in GNU ed 1.20-pre3; 
warn only if trying to modify the buffer:

$ ed /etc/profile
2840
1d
/etc/profile: warning: read-only file