?? envvar-check
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if (FOO=FOO; unset FOO) >/dev/null 2>&1; then as_unset=unsetelse as_unset=falsefi$as_unset VERSION_CONTROL SIMPLE_BACKUP_SUFFIXif test "${VERSION_CONTROL+set}" = set; then echo "$0: the VERSION_CONTROL envvar is set --" \ ' unset it and rerun this test' >&2 exit 1fiif test "${SIMPLE_BACKUP_SUFFIX+set}" = set; then echo "$0: the SIMPLE_BACKUP_SUFFIX envvar is set --" \ ' unset it and rerun this test' >&2 >&2 exit 1fi?? 快捷鍵說明
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