Bash shell脚本使用表达式和条件语法来执行条件判断和控制流程。下面是一个解决方法示例：

#!/bin/bash

# 示例1：if-else条件语句
number=10

if [ $number -eq 10 ]; then
    echo "Number is equal to 10"
else
    echo "Number is not equal to 10"
fi

# 示例2：if-elif-else条件语句
age=20

if [ $age -lt 18 ]; then
    echo "You are a minor"
elif [ $age -ge 18 ] && [ $age -lt 65 ]; then
    echo "You are an adult"
else
    echo "You are a senior citizen"
fi

# 示例3：case语句
fruit="apple"

case $fruit in
    "apple") echo "It's an apple";;
    "banana") echo "It's a banana";;
    "orange") echo "It's an orange";;
    *) echo "It's an unknown fruit";;
esac

# 示例4：布尔表达式
boolean1=true
boolean2=false

if [ $boolean1 == true ] && [ $boolean2 == false ]; then
    echo "Both booleans are true"
fi

# 示例5：逻辑运算符
number=10

if [ $number -gt 5 -a $number -lt 15 ]; then
    echo "Number is between 5 and 15"
fi

以上示例演示了Bash shell脚本中常见的表达式和条件语法的用法，包括if-else条件语句、if-elif-else条件语句、case语句、布尔表达式和逻辑运算符。根据具体需求，可以根据这些语法构建自己的脚本逻辑。