Tilde expansion during command search

[Dan Douglas]

Hi, from this discussion:

https://github.com/koalaman/shellcheck/issues/195#issuecomment-49678200

I can't find any reference that says substituting a literal tilde in PATH 
should occur during command search.

    $ ( cd ~
    mkdir tmpdir
    echo $'#!/bin/sh\necho "Hello from ${BASH_SOURCE}!"' >~/tmpdir/testscript
    chmod u+x ~/tmpdir/testscript
    PATH=\~/tmpdir
    typeset -p PATH
    testscript )
    
    declare -x PATH="~/tmpdir"
    Hello from /home/devtest/tmpdir/testscript!

    $ echo "$BASH_VERSION"
    4.3.18(1)-release

-- 
Dan Douglas