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Top Forums Shell Programming and Scripting Environment Variables in Shebangs Post 302142464 by neked on Friday 26th of October 2007 10:29:41 AM
Old 10-26-2007
Quote:
Originally Posted by drl
....[/CODE]
cheers, drl
Thanks drl for the idea. It is similar to what I am doing now, which is running sed scripts to substitute interpreters in shebangs.

It is really strange that such an issue has lingered for a long time without a solution. I can imagine a couple of things that could solve this:

- Changes to the exec() system function that porter referred to, such that it can handle environment variables. This might be too hard.

- Create a program that takes the name of an environment variable and runs the executable that the environment variables points to. So if the program is called envexec, the shebang would look like this:

#!/usr/bin/envexec PYTHON_24

I imagine that one of the requirements of such a program is that it doesn't create a sub-shell on which to execute that command, but rather execute the interpreter in the same shell the system would execute it under if it was normally configured in the shebang.

Does anyone know of any programs around that do that? Or, for that matter, an easy way to implement such a program?
 

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PYTHON-CONFIG(1)					      General Commands Manual						  PYTHON-CONFIG(1)

NAME
python-config - output build options for python C/C++ extensions or embedding SYNOPSIS
python-config [ --prefix ] [ --exec-prefix ] [ --includes ] [ --libs ] [ --cflags ] [ --ldflags ] [ --help ] DESCRIPTION
python-config helps compiling and linking programs, which embed the Python interpreter, or extension modules that can be loaded dynamically (at run time) into the interpreter. OPTIONS
--cflags print the C compiler flags. --ldflags print the flags that should be passed to the linker. --includes similar to --cflags but only with -I options (path to python header files). --libs similar to --ldflags but only with -l options (used libraries). --prefix prints the prefix (base directory) under which python can be found. --exec-prefix print the prefix used for executable program directories (such as bin, sbin, etc). --help print the usage message. EXAMPLES
To build the singe-file c program prog against the python library, use gcc $(python-config --cflags --ldflags) progr.cpp -o progr.cpp The same in a makefile: CFLAGS+=$(shell python-config --cflags) LDFLAGS+=$(shell python-config --ldflags) all: progr To build a dynamically loadable python module, use gcc $(python-config --cflags --ldflags) -shared -fPIC progr.cpp -o progr.so SEE ALSO
python (1) http://docs.python.org/extending/extending.html /usr/share/doc/python/faq/extending.html AUTHORS
This manual page was written by Johann Felix Soden <johfel@gmx.de> for the Debian project (and may be used by others). November 27, 2011 PYTHON-CONFIG(1)
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