Viewing history of conda transactions?

There is a --revisions, -r flag for this.

conda list --revisions

Check the conda list --help for more info.

If you'd like an exact history, there is a conda-meta/history log in every environment. You could, for example, pull out every command ever executed in an environment, plus a timestamp, using

grep -B1 "^# cmd" ${CONDA_PREFIX}/conda-meta/history

When you use the "my_env/conda-meta/history", it shows the exact cmd as well that as been used for the successive revisions and it shows the date as well.

For example, following is the snippet of the my_env/conda-meta/history

==> 2020-04-08 03:47:11 <==
# cmd: /home/calvin/anaconda3/bin/conda update -c nilmtk nilmtk
# conda version: 4.8.3