To reproduce:
1. Add the following line as last line to postgres.conf file
archive_command='copy "%p" "xxxxx"'
Make sure that there is no CR LF characters after this line
2. Restart postgres
3. Issue SHOW archive_command
Observed result:
unset
Note. Adding a newline after this line causes archive_command to be set
correctly.
Using
"PostgreSQL 8.1.0 on i686-pc-mingw32, compiled by GCC gcc.exe (GCC) 3.4.2
(mingw-special)"