Copy select netCDF dimension n times and all variables to new netCDF

I'm having trouble thinking of a way to copy a netCDF file n times on dimension time. The file contains 8 time dates but I need to copy the 4th, 5th, 6th, and 7th values of dimension time 6 times along with each of the variables and the 8th once to a new netCDF file. What I'm hoping to create is dimension time of 25.

Any help with this irrational way of thinking would be appreciative.

Solution

The meaning of all the options is in the manual:

ncrcat -O -F -d time,4,7 in.nc out.nc
ncrcat --rec_apn -F -d time,4,7 in.nc out.nc
ncrcat --rec_apn -F -d time,4,7 in.nc out.nc
ncrcat --rec_apn -F -d time,4,7 in.nc out.nc
ncrcat --rec_apn -F -d time,4,7 in.nc out.nc
ncrcat --rec_apn -F -d time,4,8 in.nc out.nc