The list command shows your locally installed gems:
$ gem list
*** LOCAL GEMS ***
abbrev (default: 0.1.0)
awesome_print (1.9.2)
base64 (default: 0.1.1)
benchmark (default: 0.2.0)
bigdecimal (default: 3.1.1)
bundler (default: 2.3.7)
cgi (default: 0.3.1)
csv (default: 3.2.2)
date (default: 3.2.2)
debug (1.4.0)
delegate (default: 0.2.0)
did_you_mean (default: 1.6.1)
digest (default: 3.1.0)
drb (default: 2.1.0)
drip (0.1.1)
english (default: 0.7.1)
[...]
The list includes defaults gems and bundled gems both of which were shipped with Ruby by default. In Ruby 3.1, the default gems are 70 gems in total including bigdecimal, bundler, csv, did_you_mean etc. and the bundled gems are debug, rake etc.
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