关于用shell调用交互式命令的问题

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代码:

[color=blue]-(dearvoid@LinuxEden:tty3)-(~/tmp)-
[4017 0][/color] [color=red]; cat file
[/color]p
d
4
p
q
[color=blue]-(dearvoid@LinuxEden:tty3)-(~/tmp)-
[4017 0][/color] [color=red]; fdisk /dev/hda < file
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The number of cylinders for this disk is set to 4863.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help):
Disk /dev/hda: 40.0 GB, 40000000000 bytes
255 heads, 63 sectors/track, 4863 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1        1216     9767488+  83  Linux
/dev/hda2            1217        3555    18788017+  83  Linux
/dev/hda3            3556        4830    10241437+  83  Linux
/dev/hda4            4831        4863      265072+  82  Linux swap / Solaris

Command (m for help): Partition number (1-4):
Command (m for help):
Disk /dev/hda: 40.0 GB, 40000000000 bytes
255 heads, 63 sectors/track, 4863 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1        1216     9767488+  83  Linux
/dev/hda2            1217        3555    18788017+  83  Linux
/dev/hda3            3556        4830    10241437+  83  Linux

Command (m for help):
[color=blue]-(dearvoid@LinuxEden:tty3)-(~/tmp)-
[4017 0][/color] [color=red]; o
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