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# Try to make a random temp directory
# Build the intended directory name, with the last element a random integer
# from 1..2^31
dn=${TMPDIR:-/tmp}/${1:-mktd}.$$.$(rndi 1 2147483648)
# Create the directory and print its name if successful
mkdir -m 700 -- "$dn" && printf '%s\n' "$dn"
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