关于linux：文件名无法在bash中使用下划线“_”正确打印

Filename not printing correctly with underscore “_” in bash

我正在使用这个

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DATE_FOLDER=$(date +"%b-%d-%a-%G")
FILENAME="HOME_$date1.tar.gz"

echo $BACKUP_DESTINATION/$DATE_FOLDER/$FOLDERNAME_$FILENAME

我的输出是

1	home/May-04-Wed-2011/HOME_May-04-0718PM-2011.tar.gz

但如果我使用" -"代替下划线"_"

1	echo $BACKUP_DESTINATION/$DATE_FOLDER/$FOLDERNAME-$FILENAME

那么我的输出是正确的

1	/home/May-04-Wed-2011/vmware-HOME_May-04-0717PM-2011.tar.gz

_是变量名的有效字符，$FOLDERNAME_不存在。

1	echo"$BACKUP_DESTINATION/$DATE_FOLDER/${FOLDERNAME}_$FILENAME"