I

1. ¥, ♠, ℗, $, £, €, ☻, are not all currency symbols.

II
1. man bash
2. echo $x
3. read x
4. read -p "Type var value: " x
5. -n
6. ;
7. read -p "Type var value: " x ; echo "var value is: $x"

III
1- C'est l'option -e
2- read -p "Type an HEX UNICODE: " x; echo -e "Corresponding CHAR: \U$x"
3 - 

IV - on lui a donné l'option -C
2 - echo -e "\U1300" | hexdump -C