shell script day05- interactive input and for statement

First, the interactive input (please try to avoid using)

　　read python with input () function input

　　The read command may define a plurality of variable values ​​at the same time; and the contents of the input space separator default, the value of the input variable value corresponding to a; if too many variables default values, the last value will be given a final variable.

　　If the default value is too small, the excess will become variable control

　　How 1.read input:

　　　　echo "Please enter a directory."

　　　　　　 (We need to cancel echo -n newline)

　　　　echo "Please enter a directory"; read variables

　　　　Please enter a directory: \ etc

　　Common parameters:

• -p read -p "Please enter a directory" variable
• -t read -t 5 "Please enter a directory" // define the variable timeout

　　Script Default:

　　　　

Two, for the statement cycle

　　for scenarios statement: When a loop is executed and the function needs to perform different objects (object must be the same data)

　　format for statement:　　

for variables in A 
    loop 
done

　　List Builder way:

1. Direct given a list of strings
2. List of integers
3. Returns a list of command
4. glob mechanisms - file name wildcard mechanism
5. Variable references - mass participation　　

       supplement