$_vim_cmd = '/usr/local/bin/vim';
`$_vim_cmd  . ' -c "normal \r" -c wq ~/vimwiki/testing.md'`;

##</code><code>##

$_vim_cmd = '/usr/local/bin/vim';
my $value = ' -c "normal \r" -c wq ~/vimwiki/testing.md';
`$_vim_cmd  $value`;

##</code><code>##

    my $c1 = ' -c "normal ';
    my $c3 = '" -c wq ~/vimwiki/testing.md';
    `$_vim_cmd $c1\r$c3`;