Unfortunately this cannot be done because the resize4fs program is missing from the rescue filesystem. You'll have to use a rescue distro, for example gparted-live, where the ext4 capabilities are already incorporated into the up to date resize2fs. CentOS/RHEL 5 ships with an old resize2fs and ext4 capabilities are in separate programs.
If it were a matter of expanding the filesystem this could be done on a live system.
If it were not the root filesystem you might be able to unmount the file system and do this on a live filesystem.
If it were not ext4 you could use resize2fs.
In any case a shrink involves downtime for that filesystem.
There is however a fsck.ext4 in the rescue filesystem so you can still do fscks in rescue mode.
If it were a matter of expanding the filesystem this could be done on a live system.
If it were not the root filesystem you might be able to unmount the file system and do this on a live filesystem.
If it were not ext4 you could use resize2fs.
In any case a shrink involves downtime for that filesystem.
There is however a fsck.ext4 in the rescue filesystem so you can still do fscks in rescue mode.
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