Dont own a steam deck, but at a guess you might be able to add the terminal lines to change shells to you bashrc, should load it in on first start and then fish will be default from then on.
this post was submitted on 01 Jun 2024
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Ah, sorry, I realized that fish is already installed by default. Same about zsh. So no additional steps needed, I just changed my default shell for my user and it works.
I think you can install fish from the discover store, which will persist between updates. You may need to also update its permissions through flatseal so that it has full file system access.
Some other options for packages are to install them through nix or distrobox. There's also a set of commands for installing a package locally, but I would have to look it up. It involves setting a temporary cache directory, downloading the package there without installing it, and then installing the contents of cache to a folder in user-space.
Simplest answer would be to launch Fish as the last step in your bash profile.
I imagine the SteamOS update process probably needs the default system shell to be bash, (if they're changing it with each update) but that won't stop you from getting the benefits of Fish during your login terminal sessions.
Source: I don't like bash much, but have encountered other cases where changing the default shell was too invasive. It's about an 80% solution, and the next 15% is covered well enough by invoking my preferred shell before invoking my script written for my preferred shell.
you might have to do https://wiki.archlinux.org/title/Command-line_shell#Changing_your_default_shell after every update. Maybe put it in a shell script and make .bashrc execute it, so that it switches your default to fish, after it has been reset to bash. This script could also be used to reinstall fish after the update.