pyenv/libexec/pyenv-version-file-read

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#!/usr/bin/env bash
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# Usage: pyenv version-file-read <file>
set -e
[ -n "$PYENV_DEBUG" ] && set -x
VERSION_FILE="$1"
if [ -e "$VERSION_FILE" ]; then
# Read the first non-whitespace word from the specified version file.
# Be careful not to load it whole in case there's something crazy in it.
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words=( $(cut -b 1-1024 "$VERSION_FILE") )
versions=("${words[@]}")
if [ -n "$versions" ]; then
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OLDIFS="$IFS"
{ IFS=:
echo "${versions[*]}"
}
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IFS="$OLDIFS"
exit
fi
fi
exit 1