Shell programming (notes)
In the case of file permission . / file (that is to execute) execute the file
without permission . . /File (can be executed, it is two dots not a period)
Task in front and back
- Pause the currently executing task-Ctrl+z
- View suspended tasks-jobs
- Put the task in the background and continue to run-bg task number
- Put the task in the foreground and continue to run-fg task number
echo
- Cancel line breaks-echo-n "Hello word!"
- Print escape character-echo-e "\n"
Custom command alias
Only settings in the corresponding configuration file will take effect permanently
- [root@root~]# vi .bashrc
- # Add an alias for the shutdown command
- Shutdown=‘shutdown -h -now’