sed不工作在Linux Centos，Ubuntu的，

我有一个简单的脚本，给我一些文件的值。 我正在使用sed来获取该值（语法在下面给出）。 这些命令一直工作到昨天。 但现在我没有得到任何价值，当我运行这些命令。 我没有改变任何东西，所以我很惊讶，是什么原因。 任何人都可以请告诉我如何debugging我的问题？ 下面是文件的文字：

May 1 11:59:31 box2 kernel: usb 1-3: new high speed USB device using ehci_hcd and address 24 May 1 11:59:31 box2 kernel: usb 1-3: New USB device found, idVendor=0411, idProduct=0105 May 1 11:59:31 box2 kernel: usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=5 May 1 11:59:31 box2 kernel: usb 1-3: Product: USB-SATA Bridge May 1 11:59:31 box2 kernel: usb 1-3: Manufacturer: BUFFALO May 1 11:59:31 box2 kernel: usb 1-3: SerialNumber: 00001412AA38 May 1 11:59:31 box2 kernel: usb 1-3: configuration #1 chosen from 1 choice May 1 11:59:31 box2 kernel: scsi27 : SCSI emulation for USB Mass Storage devices May 1 11:59:38 box2 kernel: scsi 27:0:0:0: Direct-Access BUFFALO External HDD PQ: 0 ANSI: 2 CCS May 1 11:59:38 box2 kernel: sd 27:0:0:0: Attached scsi generic sg6 type 0 May 1 11:59:38 box2 kernel: sd 27:0:0:0: [sdf] 976773168 512-byte logical blocks: (500 GB/465 GiB) May 1 11:59:38 box2 kernel: sd 27:0:0:0: [sdf] Write Protect is off May 1 11:59:38 box2 kernel: sd 27:0:0:0: [sdf] Assuming drive cache: write through May 1 11:59:38 box2 kernel: sd 27:0:0:0: [sdf] Assuming drive cache: write through May 1 11:59:38 box2 kernel: sdf: sdf1 May 1 11:59:38 box2 kernel: sd 27:0:0:0: [sdf] Assuming drive cache: write through May 1 11:59:38 box2 kernel: sd 27:0:0:0: [sdf] Attached SCSI disk 

脚本是：

  SERIAL=$(sed -n '5s/A.*: //p' filename) SIZE=$(sed -n '10s/A.*: //p' filename) MOUNT=$(sed -n '14s/A.*: //p' filename) 

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 SERIAL=$(sed -n 's/.*SerialNumber: \(.*\)/\1/p' filename) SIZE=$(sed -n 's/.*logical blocks: \(.*\)/\1/p' filename) 

 MOUNT=$(sed -n 's/.* sd[az]: \(.*\)/\1/p' filenaem)