1 outputs the following menu .----------------------- >>>>>>>
1.install the MySQL
2.install the Tomcat
3.exit
When the user selects a corresponding digital service corresponding to the installation start (output echo may alternatively), the user needs to input digital determined whether (test conditions used to achieve expression) is an integer.
! # / bin / bash
# Author: WQS-Lirrard
# Blog: https://www.cnblogs.com/wqs-Time/
# Time: 2019-04-29 20:36:09
# the Name: 4.sh
# Version : v1.0
# the Description:. This IS A Script
CAT << EOF
enter the following menu
===========================
1.install MySQL
2.install Tomcat
3.exit
===========================
EOF
the Read -p "Please enter the number you want to operate:" a
a +. 1 & $ expr> / dev / null
IF [-eq $ 0?]; the then
IF [$ a $ a -LT--gt -a 0. 4]; the then
echo "of the user input digital a $"
the else
echo "invalid number"
Exit 2
fi
the else
echo "Please enter the correct number."
exit 1
fi
if [ $a -eq 1 ];then
echo "Installing the install -Y yum the MySQL >>> -----"
SLEEP 2
echo "After two seconds, MySQL successfully installed"
Exit 0
elif [$ A -eq 2]; the then
echo "Installing --- - >>> -Y yum the install the Tomcat "
SLEEP 2
echo" after two seconds, Tomcat installed successfully "
exit 0
the else
echo" exiting "
exit. 1
Fi
