>>>>> "ADD" == Antonio Diaz Diaz <anto...@gnu.org> writes: ADD> How do you propose to implement such a warning while remaining ADD> POSIX-compliant?
Let's examine ed's helpful messages. I bet not all are listed in POSIX page either. $ ed /tmp/zzz /tmp/zzz: No such file or directory # Helpful! a www . w 4 q $ chmod 0 /tmp/zzz $ ed /tmp/zzz /tmp/zzz: Permission denied # Good to know! a www . w /tmp/zzz: Permission denied # Expected! Can't blame anybody. ? q ? q $ chmod 444 /tmp/zzz #and perhaps chown somebody_else /tmp/zzz $ ed /tmp/zzz #Ho hum, every thing looks good... 4 a www . w /tmp/zzz: Permission denied # What? Why didn't you (ed) warn me above, with # e.g., "Read-only file"! ed knew all along that the file was booby # trapped, but didn't have a "sliver of gratitude" to at least warn me. # So only after a long careful painstaking edit, it turns out "you might # as well send your edit to your grandmother, because you are not going # to save it where you thought you were before you bothered to start in # the first place."
