How to manually add a new user account by command line in Mac OSX Snow Leopard

sh-3.2# dscl . -create /Users/svnuser
sh-3.2# dscl . -create /Users/svnuser UserShell /bin/bash
sh-3.2# dscl . -passwd /Users/svnuser passwd
sh-3.2# dscl . -create /Users/svnuser RealName SvnUser
sh-3.2# dscl . -create /Users/svnuser UniqueID 510  
sh-3.2# dscl . -create /Users/svnuser PrimaryGroupID 80
sh-3.2# dscl . -create /Users/svnuser NFSHomeDirectory /Users/svnuser
sh-3.2# cp -R /System/Library/User\ Template/English.lproj/ /Users/svnuser
sh-3.2# chown -R svnuser:staff /Users/svnuser

Refer from :

http://serverfault.com/questions/20702/how-do-i-create-user-accounts-from-the-terminal-in-mac-os-x-10-5

http://osxdaily.com/2007/10/29/how-to-add-a-user-from-the-os-x-command-line-works-with-leopard/

Useful rar command line

Usage: rar <command> -<switch 1> <switch N> <archive> <files....>
               <@listfiles...>  <path_to_extract\>

<Commands>
  a     Add files to archive
  x     Extract files with full path


<Switches>

  m<0..5>   Set compression level (0-store...3-default...5-maximal)

  rr[N]     Add data recovery record

  v[k,b]    Create volumes with size=*1000 [*1024, *1]

So, normally we use :

rar a -m5 -rr -v600000k abc.rar abcfiles

It will be max compression level, with recovery record, and also multi-volume with 600MB for each files.