The Root Environment

1. set the ROOTSYS environment variable (on UNIX machines it is done by STAR login script)
2. Adjust the Root profile ".rootrc". This file contains some information useful to Root. Root looks for this file in
   1. the current directory
   2. the user's home directory
   3. the $ROOTSYS directory

The last means if you do nothing special, your Root defaults are defined by $ROOTSYS/.rootrc. Here are some examples of what parameters are defined in the Root profile:

• the Root macro search path
• the Root dynamic library search path
• the name and place of the Root logon macro that is executed just as one launches the Root session before a Root prompt is displayed
• the name and place of the Root alias macro that is loaded just before any Root script is executed

Unix.*.Root.DynamicPath:.:$(ROOTSYS)/lib:$(STAR_LIB):$(STAF_LIB)
Unix.*.Root.MacroPath:.:$(STAR)/StRoot/macros:$(STAR)/StRoot/test:$(ROOTSYS)/macros
WinNT.*.Root.DynamicPath:./;$(ROOTSYS)/star/bin;//Sol/afs_rhic/star/packages/dev/.intel_wnt/bin;$(ROOTSYS);$(ROOTSYS)/bin;$(PATH)
WinNT.*.Root.MacroPath:./;$(home)/root/macros;$(ROOTSYS)/tutorials;$(ROOTSYS)/star/macros;//Sol/afs_rhic/star/packages/dev/.intel_wnt/bin;$(ROOTSYS)/macros

# Rint (interactive ROOTexecutable) specific alias, logon and logoff macros
Rint.Load: $(ROOTSYS)/tutorials/rootalias.C
Rint.Logon: $(STAR)/StRoot/macros/rootlogon.C
Rint.Logoff: $(ROOTSYS)/tutorials/rootlogoff.C
Rint.History: $(HOME)/.root_hist

J:\Public\root> root4star -h
Usage: root [-l] [-b] [-n] [-q] [file1.C ... fileN.C]
Options:
  -b : run in batch mode without graphics
  -n : do not execute logon and logoff macros as specified in .rootrc
  -q : exit after processing command line macro files
  -l : do not show splash screen

How to start STAR Root demos on UNIX (sample log)
(Sun Solaris and Linux only, for the moment)

1. Select on the latest STAR Library versions:
   • starpro - to select version
   • stardev - to select version
   • starnew - to select version
   • starver 98j - to select the version <98j> of STAR library (this is the library which was used for MDC1)
2. Type: root4star
3. See the Html version of the STAR_demos on the Web below.

How to quit STAR Root

root [3] .q
This is the end of ROOT -- Goodbye

How to install Root and start STAR Root demos with Windows NT

1. Click the "START" button
2. Select "Run"
3. Type:
   • \\hepburn\info\installation
4. Double click "Root icon"
5. Watch for Root banner:

   

6. See Learning to User Root in STAR
7. Read about using "ROOT in Windows" by Andrew Haas