It is very easy to change the directory from inside a Perl program however as soon as the program exits the changes will be lost. This is true of Perl or C or Bash or anything that runs as a child of the shell. A child process cannot change its parent's environment.
This would not solve the OP's problem of course, but I'd like to point out that when one wants a process to set the parent's environment, and the parent is a shell, one usually does this:
$ eval `COMMAND`
An example of COMMAND would be ssh-agent, which outputs:
SSH_AUTH_SOCK=/tmp/... SSH_AGENT_PID=...
The output then gets eval-ed by the shell and becomes part of the shell's environment.
-- dave
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