Bash csh zsh ksh tksh fish are powerful CLI tools
Entire networks can be controlled and build with them.
Let's take for example command line tools to control media output
For me e.g mplayer and vlc -I cli are much more interesting when it comes down to standard control of media playback. I prefer to use MOC (mocp) Music
on Console, instead of bulky RAM hungry programs, which go on the internet to _fetch data that I never asked for$ and thus burn bandwidth
The memory footprint of Music on Console is so low that you can use it on a system which has been built more than two and a half decades ago.
The only graphical media playback program I know that can do that also has been written by my friend Andy Loafoe and that is alsaplayer
Andy programmed alsaplayer when he saw Delitracker playing on my Amiga systems
We're talking the period when Linux was barely moving in Xwindows when you had window managers like fvwm & twm and few others.
The alsa audio interface was also just born.
It is within this context that Andy envisioned alsaplayer. It should be modular just like Delitracker Amiga, it should be lightweight Delitracker runs on an Amiga A500 with just half A megabyte of chip ram
That should still be memory left to do other the things so straight calls were made to widget libraries which explains the simplicity yet great usability of the UI. For as far as I remember Andy has also written an API for Alsaplayer
Within a few weeks to a few months of coding alsaplayer came out of Alpha and went Bèta in code stability.
Because everything was written with efficiency in mind and it was programmed as portable as possible, alsaplayer can still be used many decades after It has been written, one of the main reasons is that it has been coded by a command line programmer
For me working on the command line has always been logical, graphic user interfaces were only used when absolutely necessary think about GEOS on the C64
I started coding on the Casio FX 700p programmable calculator. I went so far to make program code that was in the book more efficient by crunching all the commands with two letter abbreviations.
The power of the Command Line something the Young Ones should Learn
Alsaplayer manpage
https://man.freebsd.org/cgi/man.cgi?query=alsaplayer&sektion=1&apropos=0&manpath=FreeBSD+6.0-RELEASE+and+Ports