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Installing in CONDA env

You can check using which perl - it should give you the perl that's located within your conda environment. In this case, it should install things into your conda-directory.

When you install packages via cpan it will also print the folder perl is installing the package into.

If you want to be extra-sure, you can also install most Perl packages via conda. Replace the ':' by '-', lower-case everything, and add 'perl-' to the beginning. In your case,

conda install -c bioconda perl-lwp-simple

this will definitely install into conda.