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bash 检查文件是否为文本文件

tag-icon • tag-icon bash shell scripting file-command
bash 检查文件是否为文本文件

我试图检查附加到电子邮件的文件是否是文本文件，如果不是，则返回错误。但是在测试过程中，我提供了有效的 text.txt，它返回“无效附件”消息。

send_email()                
{
  message=
  address=
  attachment=
  validuser=1
echo "Enter the email address: "
read address
echo ""
getent passwd | grep -q $address
if [ "$?" = "0" ]
  then
    echo -n "Enter the subject of the message: "
    read message
    echo ""

    echo "Enter the file you want to attach: "
    read attachment
    attachmenttype='file $attachment | cut -d\  -f2'
    if [ $attachmenttype = "ASCII" ]
  then 
  mail -s "$message" "$address"<"$attachment"
  press_enter
elif [ $attachmenttype = "cannot" ]
  then 
  mail -s "$message" "$address"<"$attachment"
  press_enter
else
  echo "Invalid attachment"
  press_enter
fi
 else
    echo "Invalid username"
    press_enter
fi

}

答案1

代替

attachmenttype='file $attachment | cut -d\  -f2'

你应该写：

attachmenttype=$(file "$attachment" | cut -d' ' -f2)

看http://wiki.bash-hackers.org/syntax/expansion/cmdsubst

或得到哑剧类型：

$ file -i "$attachmenttype" | cut -d' ' -f2
text/plain;

并根据文件类型决定要对文件执行什么操作。

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