fish software package provides friendly interactive shell, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fish
fish is installed in your system.
Make ensure the fish package were installed using the commands given below,
$ sudo dpkg-query -l | grep fish *
You will get with fish package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Shells |
| Package | fish |
| Version | 2.3.1-1 |
| Description | friendly interactive shell |
| Sub Section | Shells |
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