当我试图使shell脚本显示错误时,我必须做什么？
[rehamadel@localhost bin]$ sudo vi my_script.sh
[sudo] password for rehamadel:
[rehamadel@localhost bin]$ ls -l my_script.sh
-rw-r--r--. 1 root root 52 Jul 30 19:25 my_script.sh
[rehamadel@localhost bin]$ chmod u+x my_script.sh
chmod: changing permissions of ‘my_script.sh’: Operation not permitted