You might want to add, though, that after copying the new IDMProv.war, you should not only delete the tomcat/temp & tomcat/work folders, but also the tomcat/webapps/IDMProv folder.
Remember to keep the folder/file structures and naming conventions.
mkdir -p /tmp/IDMProv/WEB-INF/lib
cp /opt/netiq/idm/apps/tomcat/webapps/IDMProv.war .
jar -uf IDMProv.war WEB-INF/lib/UserAppStrings_fi.jar
cp /tmp/IDMProv/IDMProv.war .