Thanks Marco, David and Brian for your responses. After the diagnostic steps described below, suggested by you, I ran the setup program and told it to reinstall cygwin, cygwin-base, and adwaita-icon-theme. ssh and man are working again.
I'm a little puzzled how I got in this state, although it's possible I ran setup while I had a terminal open. And I wonder why the setup program didn't reinstall the damaged packages itself, or at least complain about them (though there were some complaints--see last paragraph below). Running strace ssh produced a popup "The procedure entry point __memcpy_chk could not be located in the dynamic link library cygwin1.dll" and cygcheck's output included Package Version Status _autorebase 001007-1 OK Missing file: /usr/share/icons/Adwaita/icon-theme.cache from package adwaita-icon-theme adwaita-icon-theme 3.26.1-1 Incomplete alternatives 1.3.30c-10 OK at-spi2-core 2.26.2-1 OK base-cygwin 3.8-1 OK base-files 4.2-4 OK bash 4.4.12-3 OK bzip2 1.0.6-3 OK ca-certificates 2.22-1 OK coreutils 8.26-2 OK csih 0.9.9-1 OK curl 7.59.0-1 OK cygrunsrv 1.62-1 OK cygutils 1.4.16-2 OK Missing file: /usr/bin/gencat.exe from package cygwin cygwin 2.10.0-1 Incomplete Those were the only 2 Incomplete packages. Finally, I've been getting errors from the post-installation that some packages were not setup, but since they all seemed to be graphical and I don't have cygwin/X installed I thought they were harmless. I guess they weren't. After the package reinstallation I get no such errors. Ross -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple