爲什麼我的bash腳本不能正常工作

Question

我在bash（一位新手）中編寫了一個腳本，它在本地閃存驅動器上創建一個文件並在其上寫入隨機數據，直到它填滿爲止。然後它將文件複製到外部USB驅動器並刪除本地文件。一旦文件已經被填滿並且位於USB驅動器上，它將被複制回本地NAND閃存，被刪除，並且再次從USB閃存驅動器複製（無限期地，直到用戶停止它或發生錯誤，無論是哪一個首先 - 這是在一個while循環）。當我運行腳本時，它顯示：

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 

並且只是掛在那裏。有人能告訴我腳本中是否有錯誤？說到bash，我很綠。下面是代碼：

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

你有這條線在頂部：

LOG="/tmp/activity.log" 

然後：

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

，因爲你需要有一個有效的它沒有意義管道後的Unix命令不僅僅是文件名。