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In the late 1950s the term folder was introduced to computing as a means to describe a hierarchical file systems employed in the design of ERMA (Electronic Recording Machine, Accounting) Mark 1.

# Bash script used to list all
file-types used within a directory structure: \
find . -type f \          
| grep -E ".*\.[a-zA-Z0-9]*$" \     
| sed -e 's/.*\(\.[a-zA-Z0-9]*\)$/\1/' \         
| sort | uniq | sort -n \        
| columns -c 5 --by-columns