You can change the length of your command history on Linux by modifying the HISTSIZE variable in your shell configuration file, such as ~/.bashrc or ~/.bash_profile.

To increase the number of commands stored in history, add the following line to the file:

```bash
export HISTSIZE=10000
```

Replace 10000 with the desired number of commands to be stored.

Save and close the file and then run the following command in your terminal to apply the changes:
```bash
source ~/.bashrc
```

Or:

```bash
source ~/.bash_profile
```

Depending on the file you are editing.

This will set the HISTSIZE environment variable to the specified value, which will determine the number of commands stored in history.
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