| center_text | Center justify vector of strings. | 
| data_manip | Interactively manipulate master files. | 
| get_all | Retrieve a vector of datasets from AFS | 
| grep_vars | Search datasets for variables matching patterns. | 
| iclean | Mess around with data interactively (clean/reshape etc.) | 
| is_writeable | Check file write permission. | 
| nonEmpty | Remove null/empty elements from list | 
| print_list | Format lists for output | 
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