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Remove whole directories:
mkdir -p /scratch/$USER/gfalFS/T3_CH_PSI
mkdir -p /scratch/$USER/gfalFS/T2_CH_CSCS
gfalFS -s /scratch/$USER/gfalFS/T3_CH_PSI srm://t3se01.psi.ch
rm -rfv /scratch/$USER/gfalFS/T3_CH_PSI/pnfs/....whatyouwannaremove
gfalFS_umount /scratch/$USER/gfalFS/T3_CH_PSI
gfalFS_umount /scratch/$USER/gfalFS/T2_CH_CSCS