Question

i have problem regarding the stderr and stdout message print on the
client console for specified costume message on specified costume
condition .i want to put it on spec file or where?

“like for example if i have build rpm xyz.rpm when after uninstall i
want to check if service of xyz is stop then and then it should be
uninstall otherwise give an error message and stop uninstall.i have
one more customization if i use -v then it should display otherwise
not.is it possible?”

Answer 1

Per rpm.org you can use the %preun script to run any normal shell commands prior to the uninstall occurring, so you could stop the service, or abort with an error.