Hello GNU grep team
I have grep (GNU grep) 3.6 on a Debian / Devuan Linux system.
Recently I noticed that when using the -o switch, grep also shows the filename
for each hit in front of the desired output, and a ":" as separator.
IIRC this was not the case in previous versions of grep [but
Gary, thank you very much for your helpful response.
Sorry I failed to see this GNU extension/default and the -H and -h switches
even though I looked :-)
Maybe a hint in the man entry for -o might be good; e.g. "Also see: -h, -H".
In hindsight, I also understand the effect of a peculiarity of