pyenv/libexec/rbenv-default

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#!/usr/bin/env bash -e
RBENV_VERSION="$1"
if [ -z "$RBENV_VERSION" ]; then
echo "usage: rbenv default VERSION" >&2
exit 1
fi
# Make sure the specified version is installed
rbenv-prefix "$RBENV_VERSION" >/dev/null
echo "$RBENV_VERSION" > "${HOME}/.rbenv/default"