linux shell腳本 ＃!/bin/bash＃script_cp1＃

＃!/bin/bash ＃script_cp1 ＃     
echo   -e  "input a file name in the current directory:\c" 
read   FILE 
echo  ${FILE:?"you must input a file name,please try again"}
cp  $FILE    ${FILE}_bak  
vi   $FILE