Use source deactivate to deactivate the environment before removing it, replace ENV_NAME with the environment you wish to remove:

source deactivate
conda env remove -n ENV_NAME

First you have to deactivate your environment before removing it. You can remove conda environment by using the following command

Suppose your environment name is "sample_env" , you can remove this environment by using

source deactivate    
conda remove -n sample_env --all

'--all' will be used to remove all the dependencies

First deactivate the environment and come back to the base environment. From the base, you should be able to run the command conda env remove -n <envname>. This will give you the message

Remove all packages in environment C:\Users\<username>\AppData\Local\Continuum\anaconda3\envs\{envname}:

Environments created with the --prefix or -p flag must be removed with the -p flag (not -n).

For example: conda remove -p </filepath/myenvironment> --all, in which </filepath/myenvironment> is substituted with a complete or relative path to the environment.

My environment name is: test

conda remove -n test --all

After making sure your environment is not active, type:

$ conda env remove --name ENVIRONMENT

You probably didn't fully deactivate the Conda environment - remember, the command you need to use with Conda is conda deactivate (for older versions, use source deactivate). So it may be wise to start a new shell and activate the environment in that before you try. Then deactivate it.

You can use the command

conda env remove -n ENV_NAME

to remove the environment with that name. (--name is equivalent to -n)

Note that you can also place environments anywhere you want using -p /path/to/env instead of -n ENV_NAME when both creating and deleting environments, if you choose. They don't have to live in your conda installation.

UPDATE, 30 Jan 2019: From Conda 4.6 onwards the conda activate command becomes the new official way to activate an environment across all platforms. The changes are described in this Anaconda blog post

This worked for me:

conda env remove --name tensorflow

Because you can only deactivate the active environment, so conda deactivate does not need nor accept arguments. The error message is very explicit here.

Just call conda deactivate https://github.com/conda/conda/issues/7296#issuecomment-389504269

To remove complete conda environment :

conda remove --name YOUR_CONDA_ENV_NAME --all

You may try the following: Open anaconda command prompt and type

conda remove --name myenv --all

This will remove the entire environment.

Further reading: docs.conda.io > Manage Environments

Official documentation way worked for me:

conda remove --name myenv --all

Or just conda env remove --name myenv.

To verify that the environment was removed, in your terminal window or an Anaconda Prompt, run:

conda info --envs

The environments list that displays should not show the removed environment.

You anaconda3 enviroments folder might list an empty folder of deleted environment in your anaconda3 installation folder, like:

/opt/anaconda3/envs

There're 3 ways to achieve this in total. Assuming you have a environment named myenv,

1. conda env remove --name myenv, -n is shortcut for --name.

2. conda remove --name myenv --all.

3. Delete the env folder directly. (Not recommended)

   # list environments and their locations
   conda env list
   # or
   # conda info --envs
   
   # delete the folder listed
   rm -rf /Users/username/.local/share/conda/envs/myenv
   

If you wanna delete the environment without a prompt to let you check again. Use -y, shortcut for --yes. (For global use check silent prompt in conda)

conda env remove -n myenv -y
conda remove -n myenv --all -y

References

• conda env --help
• conda remove --help

on terminal it's showing

(base) [root@localhost ~]#

simply hit command : conda deactivate

and you are out of conda env , now your prompt will look like

[root@localhost ~]#

View the environments in Anaconda or miniconda:

conda env list

If you have created an environment using name then use:

conda remove -n envname --all

if you have created an environment using prefix then use:

conda remove -p [path] --all

Change the envname with your environment name and in case of prefix provide the complete path of the environment eg: C:/Users/techv/Desktop/project/env.
--all will remove all the dependencies of the target environment.

I hope this answer will be helpful.

if you are unfamiliar with the command line , you can remove it using the anaconda dashboard

In my windows 10 Enterprise edition os this code works fine: (suppose for environment namely testenv)

conda env remove --name testenv

if you are in base:

(base) HP-Compaq-Elite-8300-CMT:~$ 

remove env_name by:

conda env remove -n env_name

if you are already in env_name environment :

(env_name) HP-Compaq-Elite-8300-CMT:~$ 

deactivate then remove by :

conda deactivate
conda env remove -n env_name