pyenv/libexec/rbenv-set-default

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