06-17-2011
Once you mounted your new partition into /usr/, you can no longer see all the files you used to have in there. They're not deleted, they're still on disk, but all you see is the empty partition you put overtop. And without /usr/, many important libraries and programs are missing.
If you didn't put it in the mount table, you should be able to fix this just by rebooting the machine because you didn't actually destroy anything.
I'm presuming you wanted to add space to /usr? It doesn't work quite like that, you can't mount one partition on top of another partition to get one larger partition.
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PARTX(8) System Manager's Manual PARTX(8)
NAME
partx - telling the kernel about presence and numbering of on-disk partitions.
SYNOPSIS
partx [-a|-d|-l] [--type TYPE] [--nr M-N] [partition] disk
DESCRIPTION
Given a block device ( disk ) and a partition table type , try to parse the partition table, and list the contents. Optionally add or
remove partitions.
This is not an fdisk - adding and removing partitions is not a change of the disk, but just telling the kernel about presence and numbering
of on-disk partitions.
OPTIONS
-a add specified partitions or read disk and add all partitions
-d delete specified or all partitions
-l list partitions. Note that the all numbers are in 512-byte sectors.
--type TYPE
Specify the partition type -- dos, bsd, solaris, unixware or gpt.
--nr M-N
Specify the range of partitions (e.g --nr 2-4).
SEE ALSO
addpart(8), delpart(8), fdisk(8), parted(8), partprobe(8)
AVAILABILITY
The partx command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
11 Jan 2007 PARTX(8)