文章详细介绍了在Shell脚本中使用if-else和elif进行条件判断的例子，包括检查文件是否存在和判断是否是目录。通过实例演示了如何编写和执行含有条件逻辑的简单Shell程序。
if 条件语句
[root@localhost shell]# cat IfDemon01.sh
if [ -f /opt/jin.sh ];then
echo "this is a file "
else
echo "this is not a file"
fi[root@localhost shell]# bash -n IfDemon01.sh
[root@localhost shell]# bash IfDemon01.sh
this is a file
if 双分支语句
[root@localhost shell]# cat IfDemon02.sh
#!/bin/sh
if [ -d /etc/hosts ];then
echo "this is not a directory"
elif [ -f /etc/jin ]; then
echo "this is a file"
else
echo " it doesn't exist"
fi
[root@localhost shell]# bash -n IfDemon02.sh
[root@localhost shell]# bash IfDemon02.sh
it doesn't exist
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