use interpreter like python based on script path

README.md

script has the same shebang in all cases. it depends on the path to the script which interpreter is used

no special environment setup, not additional wrappers, without changing shebang in scripts

just one configuration file/directory to specify which tool should use which environment. compatible with SCL, virtualenv and other available ways to get different version in one system

#!./python

to simulate the same tool in different path, i use symlink a or b to the original script.sh

case 1:

$ ./a
running in 2.5

case 2:

$ ./b
running in 2.6

a

script.sh

b

script.sh

python

#!/bin/bash

case $1 in
  ./a)
	i=python2.5
	;;
  ./b)
	i=python2.6
	;;
esac

exec ./$i "$@"

python2.5

#!/bin/bash

echo running in 2.5
s=$1

export I=2.5

shift
bash "$@"

python2.6

#!/bin/bash

echo running in 2.6
s=$1

export I=2.6

shift
bash "$@"

script.sh

#!./python

echo $I