Reads the lines of the specified file into an array. The resulting array is in the dedicated variable, MAPFILE.

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Last 12 symbols from UUID: uuidgen | tail -c 12 First 8 symbols from UUID: uuidgen | head -c 8

for dir in /tmp/*/ do dir=${dir%*/} echo ${dir##*/} done

Bash function to read the lines of a file into an array using the builtin, mapfile.