shell:select 用法

1）选择操作系统

 #!/bin/sh
echo "What is your favourite OS?"
select var in "Linux" "Gnu Hurd" "Free BSD" "Other";
do
echo "You have selected $var"
break
done

2）修改文件权限

#!/bin/bash

echo "This script can make any of the files in this directory private."
echo "Enter the number of the file you want to protect:"

PS3="Your choice: "
QUIT="QUIT THIS PROGRAM - I feel safe now."
touch "$QUIT"

select FILENAME in *;
do
  case $FILENAME in
        "$QUIT")
          echo "Exiting."
          break
          ;;
        *)
          echo "You picked $FILENAME ($REPLY)"
          chmod go-rwx "$FILENAME"
          ;;
  esac
done
rm "$QUIT"