usage: conda [-h] [-V] command ...

conda is a tool for managing and deploying applications, environments and packages.

Options:

positional arguments:
command
info Display information about current conda install.
help Displays a list of available conda commands and their help strings.
list List linked packages in a conda environment.
search Search for packages and display their information. The input is a Python regular expression. To perform a search with a search string that starts with a -, separate the
search from the options with --, like 'conda search -- -h'. A * in the results means that package is installed in the current environment. A . means that package is not
installed but is cached in the pkgs directory.
create Create a new conda environment from a list of specified packages.
install Installs a list of packages into a specified conda environment.
update Updates conda packages to the latest compatible version. This command accepts a list of package names and updates them to the latest versions that are compatible with all
other packages in the environment. Conda attempts to install the newest versions of the requested packages. To accomplish this, it may update some packages that are
already installed, or install additional packages. To prevent existing packages from updating, use the --no-update-deps option. This may force conda to install older
versions of the requested packages, and it does not prevent additional dependency packages from being installed. If you wish to skip dependency checking altogether, use
the '--force' option. This may result in an environment with incompatible packages, so this option must be used with great caution.
upgrade Alias for conda update. See conda update --help.
remove Remove a list of packages from a specified conda environment.
uninstall Alias for conda remove. See conda remove --help.
config Modify configuration values in .condarc. This is modeled after the git config command. Writes to the user .condarc file (/home/qqin/.condarc) by default.
clean Remove unused packages and caches.
package Low-level conda package utility. (EXPERIMENTAL)

optional arguments:
-h, --help Show this help message and exit.
-V, --version Show the conda version number and exit.

other commands, such as "conda build", are available when additional conda
packages (e.g. conda-build) are installed

1.Exporting the virtual environmment to *.yaml file

source activate <environment>
conda env export | tee <environment.yml>

2. Create a virtual environmment

conda create --name <<env name>

Bse on environmment  file

conda env create -f <<environment.yml> -n <<env name>

With a specific package 

onda create -n  <env name> python

With a specifc version of a package

conda create -n <env name> python=3.7

3.Update conda

conda env update -f <environment config file >

4.Install packages

For an exsiting env

conda install --name <myenv> <package name>

For current env

conda install <<pkg name>

For a specific version

conda install <pkg name>=<version>

 5.List envs

6.Update ENV path

 ~/.condarc

channels:
  - conda-forge
  - defaults
envs_dirs:
  - <env path>/anaconda/envs
pkgs_dirs:
  - <env path>/anaconda/pkgs

 7.Remove env

conda remove --name myenv --all