Here I will share some useful online tools for Linux users:
Chmod Calculator :
There is a site swaswas which provides a tool with 3d and interactive view for chmod calculator.
We can see all via 3D view and it has sticky bit , GID and UID . Even you have to just click and see which permission required . It will show you symbolic mode as well which wil be helpful ifyou just want to use that or when we do ls command we can see correct permission set or not. Tool link : chmod calculator
Crontab Calculator :
There is a site called crontab guru ,it will provide you all crontab expressions and very useful tool if you are a admin but even you are a user this tool will help you to correctly schedule a cronjob . Awesome visuals and design .
Tool link : crontab.guru
