You can increase the length of the command history in gnome-terminal by modifying the value of the HISTSIZE environment variable. Here's how you can do it:

Open the terminal and type the following command: echo $HISTSIZE. This will show you the current value of the HISTSIZE variable.

To increase the length of the command history, set the value of HISTSIZE to a larger number. For example, to set the history length to 1000 commands, type the following command: export HISTSIZE=1000.

To make this change permanent, you need to add the above command to your shell configuration file, such as .bashrc or .bash_profile. To do this, open the file in a text editor and add the following line at the end of the file: export HISTSIZE=1000.

Save the file and close the text editor. Then, close and reopen the terminal, or type source [filename] (replacing [filename] with the name of your shell configuration file, e.g. .bashrc) to apply the changes.

Note: The value of HISTSIZE only affects the number of commands stored in memory, not the number of commands stored in the history file (usually ~/.bash_history). To increase the length of the history file, you can modify the value of the HISTFILESIZE variable in the same way as described above.
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