Linux Gvim Shell While loop

#while循环: Used to continuously execute a series of commands and to read data from input files; commands are usually test conditions
#格式如下:
#while expression
#do
# Statement to being executed if expression is true
#done
#命令执行完毕, control returns to the top of the loop and executes from the beginning to the test condition false
#例: Returns True if counter is less than 5. Counter starting from 0, each time the loop processing, counter plus 1, run the script, return the number 1-5,end

1 counter=02while5  ]3do4     Expr 1 '    #此处注意 + operator requires space on both sides #5     echo  6  Done

#while循环可用于读取键盘信息. Example: The input information is set to the variable film, and the loop is ended by ctrl-d: it will be judged as a string

 1  echo   "  type<ctrl-d> to terminate   " 2  echo -N  "  Enter your most liked film:   " 3   Read FILM  4  do  5  echo -e  "  yeah! Great film The ${film}   " 6  done  

Linux Gvim Shell While loop