pyenv/libexec/rbenv-version-file-write

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#!/usr/bin/env bash
set -e
RBENV_VERSION_FILE="$1"
RBENV_VERSION="$2"
if [ -z "$RBENV_VERSION" ] || [ -z "$RBENV_VERSION_FILE" ]; then
echo "usage: rbenv write-version-file FILENAME VERSION" >&2
exit 1
fi
# Make sure the specified version is installed.
rbenv-prefix "$RBENV_VERSION" >/dev/null
# Write the version out to disk.
echo "$RBENV_VERSION" > "$RBENV_VERSION_FILE"