read usage operation
1) read reads the command line input parameters -p reads the parameters after displaying a line of text [root@linhexiao shellTest]# read -p "pls input a number:" var pls input a number:linhexiao [root@linhexiao shellTest]# echo $var linhexiao 2) -t 3 means the input is invalid after 3 seconds [root@linhexiao shellTest]# read -t 3 -p "pls input a number:" var pls input a number:[root@linhexiao shellTest]# 3) Multiple parameters can be entered after read [root@linhexiao shellTest]# read -t 30 -p "pls input two number:" a1 a2 pls input two number:23 34 [root@linhexiao shellTest]# echo $a1 $a2 23 34 4) The above code can be implemented using echo -n ""; read -t [root@linhexiao shellTest]# echo -n "please input town number:";read -t 30 a1 a2 please input town number:23 45 [root@linhexiao shellTest]# echo $a1 $a2 23 45