为什么我的bash脚本不能正常工作

Question

我在bash（一位新手）中编写了一个脚本，它在本地闪存驱动器上创建一个文件并在其上写入随机数据，直到它填满为止。然后它将文件复制到外部USB驱动器并删除本地文件。一旦文件已经被填满并且位于USB驱动器上，它将被复制回本地NAND闪存，被删除，并且再次从USB闪存驱动器复制（无限期地，直到用户停止它或发生错误，无论是哪一个首先 - 这是在一个while循环）。当我运行脚本时，它显示：

nand_test.sh: line 19: /tmp/activity.log: Text file busy 
nand_test.sh: line 19: /tmp/activity.log: Text file busy 
nand_test.sh: line 19: /tmp/activity.log: Text file busy 
nand_test.sh: line 19: /tmp/activity.log: Text file busy 

并且只是挂在那里。有人能告诉我脚本中是否有错误？说到bash，我很绿。下面是代码：

LOG="/tmp/activity.log" 

function if_error 
{ 
if [[ $? -ne 0 ]] 
then 
    print "$1 TIME:$TIME" | tee -a $LOG 
    exit $? 

fi 
} 




#whenever the echo command is ran this function allows me add a timestamp 

function echo { 
    /bin/echo `date` $* | $LOG 
} 

#condition below checks if activity.log exists. If not, it creates it. 

mydir="/media/myusb" 
chmod +x /tmp/activity.log 
activity="/tmp/activity.log" 

if [ -e "$activity" ];then 
    echo - "$activity" LOG ALREADY EXISTS >> "$activity" 

else 
    > /activity.log 
    #echo - "$activity" LOG HAS BEEN CREATED >> "$activity" 

fi 

#condition below checks if myusb directory is created. If not, it creates it. 

if [ -d "$mydir" ];then 
    echo - "$mydir" ALREADY EXISTS >> "$activity" 

else 
    mkdir /media/myusb 
#echo -  "$mydir" HAS BEEN CREATED >> "$activity" 

fi 

#check if external usb has been mounted. if not mount it. 
device0="/dev/sda1" 

if [ -b "$device0" ];then 
    echo - "$device0" IS ALREADY MOUNTED >> "$activity" 
else 
    mount LABEL=MYFLASH /media/myusb 
#echo - "$device0" HAS BEEN MOUNTED >> "$activity" 
fi 


#condition below checks if testfile.txt has been created. If not, it creates it. 

testfile="/storage/testfile.txt" 

if [ -e "$testfile" ];then 
    echo - "$testfile" FILE ALREADY EXISTS >> "$activity" 

else 
    >> /storage/testfile.txt 
    #echo - "$testfile" HAS BEEN CREATED! >> "$activity" 

fi 


dd if=/dev/urandom of=/storage/testfile.txt >> "$activity" 
ret=$? 
if_error "urandom data failed writing to testfile.txt" 

if [ "$ret" gt 0 ];then 
    echo - "NAND FLASH DATA TEST FAILED >> "$activity" 
else 
    cp "$testfile" "$mydir" 
fi 

rm "$testfile" 
sync 
sleep 3 

while [ -e "/media/myusb/testfile.txt" ] 
do 
cp /media/myusb/testfile.txt /storage 
sync 
DIFF= diff /media/myusb/testfile.txt "$testfile" 
if [ "$DIFF" != "" ];then 
    echo - "ERROR: THE FILE HAS BEEN MODIFIED" >> "$activity" 

else 
    echo - "FILE COMPARISON SUCCESSFUL" >> "$activity" 
fi 
rm "$testfile" 
sync 

Answer 1

你有这条线在顶部：

LOG="/tmp/activity.log" 

然后：

/bin/echo `date` $* | $LOG 

，因为你需要有一个有效的它没有意义管道后的Unix命令不仅仅是文件名。