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Top Forums Shell Programming and Scripting Dynamically choosing the interpreter Post 302624243 by hroptatyr on Monday 16th of April 2012 04:22:09 AM
Old 04-16-2012
That's not possible, I'm afraid, you can use /usr/bin/env as shebang to find the user's preferred command, or rather, the command in the user's environment. But you can't "change" the shebang dynamically.

I'd go for something like this
Code:
#!/usr/bin/env sh

mybash=$(command -v bash 2>/dev/null)
## maybe switch to bash
if test "${0}" != "bash" -a -n "${mybash}"; then
  exec command bash $0 $@
fi

or something along the lines of that.
 

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whereis(1)						      General Commands Manual							whereis(1)

Name
       whereis - locate source, binary, and or manual for program

Syntax
       whereis [-sbm] [-u] [-SBM dir... -f] name...

Description
       The command locates source/binary and manuals sections for specified files.  The supplied names are first stripped of leading pathname com-
       ponents and any (single) trailing extension of the form ``.ext'', for example,``.c''.  Prefixes of ``s.'' resulting from use of source code
       control are also dealt with.  The command then attempts to locate the desired program in a list of standard places.

Options
       -S dir
	  Search for source files in specified directory.

       -B dir
	  Search for binary files in given directory.

       -M dir
	  Search for manual section files in given directory.

       -b Searches only for binary files.

       -f Terminates last directory list created from use of -S, -B or -M flags and signals the start of file names.

       -m Searches only for manual section files.

       -s Searches only for source files.

       -u Searches for files that do not have one of binary, source or manual section files.  A file is said to be unusual if it does not have one
	  entry of each requested type.  Thus ``whereis -m -u *'' asks for those files in the current directory which have no documentation.

Examples
       The following finds all the files in which are not documented in with source in
       cd /usr/ucb
       whereis -u -M /usr/man/man1 -S /usr/src/cmd -f *

Restrictions
       Since the program uses to run faster, pathnames given with the -M -S and -B must be full.  That is, they must begin with a ``/''.

Files
       /usr/src/*
       /usr/{doc,man}/*
       /lib, /etc, /usr/{lib,bin,ucb,old,new,local}

																	whereis(1)
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