Question

我正在使用基于Red Hat的Linux。我正在使用此bash脚本查找所有USB设备并将其放置到selectList：

read -a devices <<< $(ls -l --time-style=long-iso /dev/disk/by-id)

while [[ ${devices[i]} != "" ]]
do
  if [[ ${devices[i]} == usb-* ]] ; 
  then
    if [[ ! ${devices[i+2]} =~ [0-9]$ ]] ; 
    then
      selectList+=${devices[i]}" "
    fi
  fi
  let "i++"
done

对于旧的Linux发行版（旧的Fedora，CentOS 7），它可以正常运行。但是在Fedora 32上，此字符串不起作用：

read -a devices <<< $(ls -l --time-style=long-iso /dev/disk/by-id)

因为

<<< $(ls -l --time-style=long-iso /dev/disk/by-id)

仅返回result ls命令的第一个字符串。

例如，命令

tail -n1 <<< $(ls -l --time-style=long-iso /dev/disk/by-id)

在CentOS 7上返回

total 0 lrwxrwxrwx 1 root root 9 2020-07-14 10:23 ata-Optiarc_DVD_RW_AD-5280S -> ../../sr0 lrwxrwxrwx 1 root root 9 2020-07-14 10:23 ata-ST3500514NS_9WJ16TBB -> ../../sda lrwxrwxrwx 1 root root 9 2020-07-14 10:23 ata-ST500DM002-1BD142_Z3T5RLF8 -> ../../sdb lrwxrwxrwx 1 root root 11 2020-07-14 10:23 md-uuid-6a3d48a2:fbd5af07:9ce92935:f469dfc7 -> ../../md127 lrwxrwxrwx 1 root root 11 2020-07-14 10:23 md-uuid-721d0cf4:5fc67883:dbbd7d4c:47ff4941 -> ../../md126 lrwxrwxrwx 1 root root 13 2020-07-14 10:23 md-uuid-721d0cf4:5fc67883:dbbd7d4c:47ff4941-part1 -> ../../md126p1 lrwxrwxrwx 1 root root 13 2020-07-14 10:23 md-uuid-721d0cf4:5fc67883:dbbd7d4c:47ff4941-part2 -> ../../md126p2 lrwxrwxrwx 1 root root 13 2020-07-14 10:23 md-uuid-721d0cf4:5fc67883:dbbd7d4c:47ff4941-part3 -> ../../md126p3 lrwxrwxrwx 1 root root 13 2020-07-14 10:23 md-uuid-721d0cf4:5fc67883:dbbd7d4c:47ff4941-part4 -> ../../md126p4 lrwxrwxrwx 1 root root 13 2020-07-14 10:23 md-uuid-721d0cf4:5fc67883:dbbd7d4c:47ff4941-part5 -> ../../md126p5 lrwxrwxrwx 1 root root 9 2020-07-14 10:23 wwn-0x5000c5002e22dc64 -> ../../sda lrwxrwxrwx 1 root root 9 2020-07-14 10:23 wwn-0x5000c5004e81f353 -> ../../sdb

但是在Fedora 32上它会返回

lrwxrwxrwx 1 root root 9 2020-07-14 10:23 wwn-0x5000c5004e81f353 -> ../../sdb

Answer 1

问题已解决。该脚本允许用户选择USB闪存并将设备的路径放入$ deviceName变量中。

for device in /dev/disk/by-id/*; 
do 
  if [[ $device == /dev/disk/by-id/usb-* ]] ;
  then
    device1=${device/"/dev/disk/by-id/"/}
    
    read -a devices <<< $(ls -l --time-style=long-iso /dev/disk/by-id | grep $device1)

    if [[ ! ${devices[9]} =~ [0-9]$ ]] ; 
    then
      selectList+=${devices[7]}"->/dev/"${devices[9]##*/}" "
    fi
  fi
done

if [ "$selectList" = "" ] ; then
    echo -e "ERROR: No USB devices found\n\r"
    exit 1
fi

echo "select the USB device"

select usbName in $selectList
do
  if [[ $usbName != "" ]] ;
  then
    break
  else
    echo "wrong USB device number"
  fi
done

deviceName="/dev/"${usbName##*->/dev/}

如何将ls命令的结果重定向为单个字符串读取-a命令？

1 个答案: