How can I standardize shell script header #! on different hosts?

I manage a large number of shell (ksh) scripts on server A. Each script begins with the line...

#!/usr/bin/ksh

When I deploy to machine B, C, and D I frequently need to use a different shell such as /bin/ksh, /usr/local/bin/ksh or even /usr/dt/bin/ksh. Assume I am unable to install a new version of ksh and I am unable to create links in any protected directories such as /usr/local/bin. At the moment I have a sed script which modifies all the scripts but I would prefer not to do this. I would like to standardize the header so that it no longer needs to be changed from server to server. I don't mind using something like

#!~/ksh

And creating a link which is on every server but I have had problems with finding home using "~" in the past when using rsh (maybe is was ssh) to call a script (AIX specifically I think). Another option might be to create a link in my home directory and ensuring that it is first in my PATH, and simply using

#!ksh

Looking for a good solu开发者_StackOverflowtion. Thanks.

Update 8/26/11 - Here is the solution I came up with. The installation script looks for the various versions of ksh installed on the server and then copies one of the ksh 93 programs to /tmp/ksh93. The scripts in the framework all refer to #!/tmp/ksh93 and they don't need to be changed from one server to the other. The script also set some variables so that if the file is every removed from /tmp, it will immediately be put back the next time a scheduled task runs, which is at a minimum every minute.

As rettops noted, you can use:

#!/usr/bin/env ksh

This will likely work for you. However, there can be some drawbacks. See Wikipedia on Shebang for a fairly thorough discussion.

#! /usr/bin/env ksh

will use whatever ksh is in the user's path.