Using  Multiple Software Versions in Unix	
Or, "How to please developers by being efficiently effective with packages."

Problem: How to share an application, with multiple versions, in an infrasturcture, using a NAS.
Using a global shared NFS mount

A possible parent structure:  
	/nfsapps/sunsparc, 
	/nfsapps/sun386i, 
	/nfsapps/linuxintel, 
	/nfsapps/linuxsparc

Examples of: Solaris Sparc

Install package to alternate location
	export VERSION_NUMBER=1.2.2
	export SOFTWARE=java
	mkdir -m755 -p /nfsapps/sunsparc/$SOFTWARE/$VERSION_NUMBER
	chown root:devel /nfsapps/sunsparc/$SOFTWARE/$VERSION_NUMBER
	cd /dir/with/package
	pkgadd -R /nfsapps/sunsparc/$SOFTWARE/$VERSION_NUMBER -d .

Install gnu to alternate location
	export VERSION_NUMBER=3.1
	export SOFTWARE=gcc
	mkdir -m755 -p /nfsapps/sunsparc/$SOFTWARE/$VERSION_NUMBER
	chown root:devel /nfsapps/sunsparc/$SOFTWARE/$VERSION_NUMBER
	tar xvf gcc*tar
	mkdir gccbuild; cd gccbuild
	sh ../gcc-3.1/configure -- \
			prefix=/nfsapps/sunsparc/$SOFTWARE/$VERSION_NUMBER
	make       #handle errors
	make test  #should be no errors
	make install

Install perl to alternate location
	export VERSION_NUMBER=5.6.1
	export SOFTWARE=perl
	mkdir -m755 -p /nfsapps/sunsparc/$SOFTWARE/$VERSION_NUMBER
	chown root:devel /nfsapps/sunsparc/$SOFTWARE/$VERSION_NUMBER
	export CC=gcc
	cd /dir/with/perl/tar/extract
	# the following steps may change with new perl releases, see your README.OSTYPE
	rm -f config.sh Policy.sh
	sh Configure - Dprefix=/nfsapps/sunsparc/$SOFTWARE/$VERSION_NUMBER -des \ 
		-Doptimize='-xpentium -xO4'
	make            #handle errors
	make test     #should be no errors
	make install

Perl CPAN mods information
	To see is a perlmodule is loaded:
		perdoc MODNAMEperldoc Net::FTP

	To get a Perl Mod

	Install CPAN mod to alternate location
	MOD=NET::Ftp.xxx    #where xxx is the MOD version
	
	export VERSION=5.6.1   #version of perl and not the 
	export MODPATH=/nfsapps/sunsparc/perl/$VERSION/bin:/nfsapps/sunsparc/bin:$PATH

	cp -r ~/.cpan/build/$MOD /nfsapps/sunsparc/perl/cpan-build
	USE: relocated make - you may have dependencies (other mods may be prereq's)
	cd /nfsapps/sunsparc/perl/cpan-build/$MOD
	more readme.txt
		#Look at REQUIREMENTS to see if there are any for prerequisite mods
		#Look at INSTALLATION for any suggested mods

	#DONT USE: 'perl Makefile.PL' without the following arguments, 
	#           or it will install in /usr/local/bin and NOT /nfsapps/sunsparc/perl/...
	perl Makefile.PL \
		PREFIX=/nfsapps/sunsparc/perl/$VERSION
		LIB=/nfsapps/sunsparc/perl/$VERSION/lib
	make         #fix any errors
	make test    #should not have any errors
	make install