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OS X compatible and fixed lowercase.
#!/bin/bash
# bash generate random alphanumeric string
#
# bash generate random 32 character alphanumeric string (upper and lowercase) and
NEW_UUID=$(cat /dev/urandom | env LC_CTYPE=C tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)
# bash generate random 32 character alphanumeric string (lowercase only)
cat /dev/urandom | env LC_CTYPE=C tr -dc 'a-z0-9' | fold -w 32 | head -n 1
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