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list, sort and unique to get directory name from filenames
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| ls -1 | awk -F'_' '{print $1 $2}' | sort -u | |
| # FLP_001_t2.nii | |
| # FLP_001_t1_nii | |
| # FLP_004_t2.nii | |
| # FLP_004_t1.nii | |
| # || | |
| # || | |
| # FLP_001 | |
| # FLP_004 |
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