1set -e 2 3echo "1 2 3" | { read a; echo "x${a}x"; } 4echo "1 2 3" | { read a b; echo "x${a}x${b}x"; } 5echo "1 2 3" | { read a b c; echo "x${a}x${b}x${c}x"; } 6echo "1 2 3" | { read a b c d; echo "x${a}x${b}x${c}x${d}x"; } 7 8echo " 1 2 3 " | { read a b c; echo "x${a}x${b}x${c}x"; } 9echo " 1 2 3 " | { unset IFS; read a b c; echo "x${a}x${b}x${c}x"; } 10echo " 1 2 3 " | { IFS=$(printf ' \t\n') read a b c; echo "x${a}x${b}x${c}x"; } 11echo " 1 2 3 " | { IFS= read a b; echo "x${a}x${b}x"; } 12 13echo " 1,2 3 " | { IFS=' ,' read a b c; echo "x${a}x${b}x${c}x"; } 14echo ", 2 ,3" | { IFS=' ,' read a b c; echo "x${a}x${b}x${c}x"; } 15echo " 1 ,,3" | { IFS=' ,' read a b c; echo "x${a}x${b}x${c}x"; } 16echo " 1 , , 3" | { IFS=' ,' read a b c; echo "x${a}x${b}x${c}x"; } 17echo " 1 ,2 3," | { IFS=' ,' read a b c; echo "x${a}x${b}x${c}x"; } 18echo " 1 ,2 3,," | { IFS=' ,' read a b c; echo "x${a}x${b}x${c}x"; } 19 20echo " 1,2 3 " | { IFS=', ' read a b c; echo "x${a}x${b}x${c}x"; } 21echo ", 2 ,3" | { IFS=', ' read a b c; echo "x${a}x${b}x${c}x"; } 22echo " 1 ,,3" | { IFS=', ' read a b c; echo "x${a}x${b}x${c}x"; } 23echo " 1 , , 3" | { IFS=', ' read a b c; echo "x${a}x${b}x${c}x"; } 24echo " 1 ,2 3," | { IFS=', ' read a b c; echo "x${a}x${b}x${c}x"; } 25echo " 1 ,2 3,," | { IFS=', ' read a b c; echo "x${a}x${b}x${c}x"; } 26