1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ramesh@dev-db ~> cat ps3.sh select i in mon tue wed exit do 下详解     case $i in         mon) echo "Monday";;         tue) echo "Tuesday";;         wed) echo "Wednesday";;         exit) exit;;     esac done ramesh@dev-db ~> ./ps3.sh 1) mon 2) tue 3) wed 4) exit #? 1 Monday #? 4