Update all conda enviroment, optionally using another executable like mamba and dry run option setting from cli.

conda_update_all_envs.sh

# define CONDACOMMAND externally to overwrite this, I use conda or mamba
# default is to use mamba, a looooot faster
CONDACOMMAND=${1:-'mamba'}

# DRYRUNCONDACOMMAND : is set to anything, just print the commands 
if [ -z $DRYRUNCONDACOMMAND ]
then 
    echo "DRYRUNCONDACOMMAND is unset, this is the real stuff"
    DRYRUNCONDACOMMAND=''
else 
    echo "DRYRUNCONDACOMMAND is set, this is a dry run"
    DRYRUNCONDACOMMAND='echo'
    printf "use :\n    unset DRYRUNCONDACOMMAND\nto clean the variable for a real run\n"
fi

# # Debug
# echo "CONDACOMMAND=$CONDACOMMAND"
# echo "DRYRUNCONDACOMMAND=$DRYRUNCONDACOMMAND"
# # print all envs
# echo  $(eval $($CONDACOMMAND env list) |  sed '/^#/d;/^$/d' | awk '{print $1}')
# # set env to base
# local env=base
# # run one loop cycle
# $DRYRUNCONDACOMMAND $CONDACOMMAND update -n $env --all -y

# list all envs , keeps only the line with path sep inside
for env in $($CONDACOMMAND env list | sed -n '/\//p' | awk '{print $1}')
do 
    printf '=%.0s' {1..100} # envs separator
    echo
    echo "updating enviroment: $env"
    echo "--------------------------" # print current env name
    echo
    $DRYRUNCONDACOMMAND $CONDACOMMAND update -n $env --all -y # update everything 
done

}