如果BASH不止一个

Question

如何在bash中创建多个“if”函数？例如，我想做这样的事情：

if [ "$answer" == "0" ]; then 0
if [ "$answer" == "1" ]; then 1
if [ "$answer" == "2" ]; then 2
else echo "error"
fi

由于

Answer 1

如果您想使用相同的测试（"$answer" ==），那么使用case会更好：

case "$answer" in
  0) echo "0" ;;
  1) echo "1" ;;
  2) echo "2" ;;
  3|4) echo "3 or 4" ;;
  *) echo "error" ;;
esac

你可以在这里找到许多关于Bash脚本的有价值的东西：

1. Advanced Bash Scripting HOWTO
2. Bash pitfalls
3. 不要忘记man bash

Answer 2

您可以使用elif

if [ "$answer" == "0" ]; then echo "0"
elif [ "$answer" == "1" ]; then echo "1"
elif [ "$answer" == "2" ]; then echo "2"
else echo "error"
fi