Dynamically choosing the interpreter

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# 1  
Old 04-16-2012
Dynamically choosing the interpreter


Is it possible to choose the inerpreter conditionally.
For example, if
whereis bash


then i need to choose

else i need to use


Is it possible to achieve in a shell script?

# 2  
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
#!/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 $@

or something along the lines of that.
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