Hi Michael, At 2023-07-18T17:47:35-0400, Michael J. Donovan via wrote: > Updated to 1.23.0 > man works as before, except when you pipe its output to another command. > > man ls | grep color > grotty:<standard input>:(<standard input>):9: warning: unrecognized X > command 'sgr 0' ignored > --color[=WHEN]
It looks like your distributor might be carrying a somewhat popular patch, often to the "site.tmac" file, that injects an "sgr" device control command into *roff output. Here's an example: https://github.com/NixOS/nixpkgs/blob/nixos-23.05/pkgs/tools/text/groff/site.tmac > In my .bashrc: > export MANROFFOPT='-c' > export GROFF_NO_SGR=1 These are mutually redundant; you only need one of them. And you still get the diagnostic message because the patch linked above pays no heed to the "GROFF_NO_SGR" environment variable. The "GROFF_SGR" (note the absence of "NO") patch apparently originated with Debian 21 years ago, but its package maintainer, Colin Watson, who handled groff (and man-db) for that distribution then and now, has dropped it from Debian's groff 1.23.0 packages. https://salsa.debian.org/debian/groff/-/commit/f0a34f20ff772f692255b7e32a05630c639f75a8 Colin's commit message summarizes the rationale for this decision more succinctly than I would. >> I turned these off for Debian in 2002 because pagers didn't cope well >> at the time, but it's now 21 years later and things have changed; SGR >> escape sequences resolve some ambiguity (see #963490) and are >> required for new features such as clickable hyperlinks. On the other hand, from Web traffic I have noticed that some people are aggrieved because when grotty(1) uses SGR escape sequences instead of overstriking, a somewhat popular hack to get the less(1) pager to colorize elements of man pages is defeated. Here is a discussion of that issue from this list earlier this month. https://lists.gnu.org/archive/html/groff/2023-07/msg00058.html The take-away is: drop the patch to "site.tmac" or ask your distributor to do so. Does this help? Regards, Branden
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