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apt is a kind of a v2 of the command-line based frontend that is in front of the APT library. Should be improved and better.
If you use apt and you pipe the output to grep or anything similar, it will also warn you like this, that it's still in development:
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
It is quite well-described here: https://debian-handbook.inf...
But the bottom line comes down to:
APT is a vast project, whose original plans included a graphical interface. It is based on a library which contains the core application, and apt-get is the first front end — command-line based — which was developed within the project.
apt is a second command-line based front end provided by APT which overcomes some design mistakes of apt-get.
Dumb question: what is the difference between apt and apt-get. In the past I always used the latter, so I'm less familiar with the former.