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How to give password in shell script?

```bash
#!bin/sh
~~cd qpixel~~
~~sudo systemctl enable mysql~~
~~mysql -u root -p~~
~~rails s~~
```
That's my bash script. When it will run `mysql -u root -p` it will ask for password. So, I have to print my password. But, I had tried with `echo` `print` none of them works. How can I input password?
<s>[Related question](https://stackoverflow.com/questions/9358509/how-to-give-password-in-shell-script#9358547) I found in SO. </s> Answers of SO didn't help me either.

That's my Bash script:
```bash
#!bin/sh
cd qpixel
sudo systemctl enable mysql
mysql -u root -p
rails s
```
When it executes the line `mysql -u root -p` it will ask for password. To do so, I have tried with `echo` and `print`, but none of them works.
How can I input a password?
<s>[Related question](https://stackoverflow.com/questions/9358509/how-to-give-password-in-shell-script#9358547) I found in SO. </s> Answers of SO didn't help me either.

shell bash password