When I start the virtual environment of conda, the prompt of bash collapses

When I started the virtual environment of conda, the prompt of bash collapsed.

Normal behavior

[user@hostname pwd]$
[user@hostname pwd]$ source activate test
(test)[user@hostname pwd]$

What happened

[user@hostname pwd]$
[user@hostname pwd]$ source activate test
(test)

The root cause is unknown, but it was because CONDA_PS1_BACKUP =" $ PS1 " was not read and was CONDA_PS1_BACKUP = when source activate was performed.

For the time being, describe the following in .bashrc and respond. export CONDA_PS1_BACKUP="[\u@\h \W]$ "

There was a discussion on github, but it was unclear how it was resolved. .. .. https://github.com/conda/conda/issues/4916

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