As of GNU coreutils 7.5 released in August 2009, sort allows a -h parameter, which allows numeric suffixes of the kind produced by du -h:
du -hs * | sort -h
If you are using a sort that does not support -h, you can install GNU Coreutils. E.g. on an older Mac OS X:
brew install coreutils
du -hs * | gsort -h
From sort manual:
-h, --human-numeric-sort compare human readable numbers (e.g., 2K 1G)
Short answer: you can't. Ports below 1024 can be opened only by root. As per comment - well, you can, using CAP_NET_BIND_SERVICE, but that approach, applied to java bin will make any java program to be run with this setting, which is undesirable, if not a security risk.
The long answer: you can redirect connections on port 80 to some other port you can open as normal user.
Run as root:
# iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080
As loopback devices (like localhost) do not use the prerouting rules, if you need to use localhost, etc., add this rule as well (thanks @Francesco):
# iptables -t nat -I OUTPUT -p tcp -d 127.0.0.1 --dport 80 -j REDIRECT --to-ports 8080
NOTE: The above solution is not well suited for multi-user systems, as any user can open port 8080 (or any other high port you decide to use), thus intercepting the traffic. (Credits to CesarB).
EDIT: as per comment question - to delete the above rule:
# iptables -t nat --line-numbers -n -L
This will output something like:
Chain PREROUTING (policy ACCEPT)
num target prot opt source destination
1 REDIRECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8080 redir ports 8088
2 REDIRECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 8080
The rule you are interested in is nr. 2, so to delete it:
# iptables -t nat -D PREROUTING 2
Best Answer
There are many ways to copy disks, file systems or files. Generally, copying the file system gives you a good clone with the flexibility that it can be a slightly different size on the target system. With the target system running some sort of live Linux (knoppix, ubuntu live, etc.), booted from a cdrom, you can create the partitions on the disk using fdisk or your favorite partition application. Assuming you have an SSH server running on the source system, take an approach similar to this:
http://www.linuxfocus.org/English/March2005/article370.shtml
The magic is happening in this command:
When using any particular method to clone disks on a live Linux environment, your only concern would likely be with the databases. The best way to backup and restore a database is to use their dump tool to make an ascii file snapshot of the database just prior to the file system dump. For mysql there is :
For postgresql, there is:
If you encounter any sort of consistancy error on the new system, restore the database. Alternately, once you have shut off services on the source system, do the DB dump again, and restore on the target, and you will not miss any recently modified data.