$ ./1.sh
-bash: ./1.sh: Permission denied
$ echo $?
126
#没有返回 0 代表执行失败

$ sh 1.sh
2020-10-27 15:28:30
$ echo $?
0
#返回 0 代表执行成功没有问题

$ vim 2.sh

#!/bin/bash

cd /root/
./1.sh

if [ $? -eq 0 ]; then
    echo "执行成功"
else
    echo "执行失败"
fi

$ sh 2.sh 
2.sh: line 4: ./1.sh: Permission denied
执行失败

$ vim 2.sh

#!/bin/bash

cd /root/
sh 1.sh

if [ $? -eq 0 ]; then
    echo "执行成功"
else
    echo "执行失败"
fi

$ sh 2.sh 
2020-10-27 15:36:09
执行成功