Generate random value

pwgen 20 -N 1
eSie9theughahkaezaa4

mktemp -u XXXXXXXXXX
IdkNcgXGUc

head -c 10 < /dev/urandom | xxd -p -c 10
d3e10200aaefc0f3da7e

shuf -ez -n20 {A..Z} {a..z} {0..9}
54IHmf8pZSKnbdE7jU13

value:base64

for i in {1..10}; do val=$(head /dev/urandom | tr -dc 'A-Za-z0-9' | head -c 24); \
echo "$val:$(echo -n "$val" | base64)"; done