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pyenv/libexec/rbenv-version-file-read

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#!/usr/bin/env bash
set -e
[ -n "$RBENV_DEBUG" ] && set -x
VERSION_FILE="$1"
if [ -e "$VERSION_FILE" ]; then
# Read and print the first non-whitespace word from the specified
# version file.
while read -a words; do
version="${words[0]}"
if [ -n "$version" ]; then
echo "$version"
exit
fi
done < <( cat "$VERSION_FILE" && echo )
fi
exit 1