kubectl apply --prune -f namespaces.json --dry-run=true

gistfile1.txt

namespace/user-af configured (dry run)
namespace/user-anm configured (dry run)
namespace/user-apo configured (dry run)
namespace/user-atm configured (dry run)
namespace/user-atu configured (dry run)
namespace/user-ers configured (dry run)
namespace/user-fd configured (dry run)
namespace/user-hwha configured (dry run)
namespace/user-jbn configured (dry run)
namespace/user-jbr configured (dry run)
namespace/user-jda configured (dry run)
namespace/user-jp configured (dry run)
namespace/user-jsj configured (dry run)
namespace/user-jsj-kubeflow configured (dry run)
namespace/user-jth configured (dry run)
namespace/user-kh configured (dry run)
namespace/user-mabd configured (dry run)
namespace/user-mb configured (dry run)
namespace/user-mvs configured (dry run)
namespace/user-pag configured (dry run)
namespace/user-rk configured (dry run)
namespace/user-shm configured (dry run)
namespace/user-so configured (dry run)
namespace/user-sps configured (dry run)
namespace/user-thl configured (dry run)
namespace/user-vn configured (dry run)
namespace/user-af pruned (dry run)
namespace/user-anm pruned (dry run)
namespace/user-apo pruned (dry run)
namespace/user-atm pruned (dry run)
namespace/user-atu pruned (dry run)
namespace/user-ers pruned (dry run)
namespace/user-fd pruned (dry run)
namespace/user-hwha pruned (dry run)
namespace/user-jbn pruned (dry run)
namespace/user-jbr pruned (dry run)
namespace/user-jda pruned (dry run)
namespace/user-jp pruned (dry run)
namespace/user-jsj pruned (dry run)
namespace/user-jsj-kubeflow pruned (dry run)
namespace/user-jth pruned (dry run)
namespace/user-kh pruned (dry run)
namespace/user-mabd pruned (dry run)
namespace/user-mb pruned (dry run)
namespace/user-mvs pruned (dry run)
namespace/user-pag pruned (dry run)
namespace/user-rk pruned (dry run)
namespace/user-shm pruned (dry run)
namespace/user-so pruned (dry run)
namespace/user-sps pruned (dry run)
namespace/user-thl pruned (dry run)
namespace/user-vn pruned (dry run)