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  1. or download this
    sub text_to_shell_lit(_) {
   return $_[0] if $_[0] =~ /^[a-zA-Z0-9_\-]+\z/;
...

my $ssh_cmd = join ' ', map text_to_shell_lit,
   ssh => 'hostname', "$echo_cmd | $passwd_cmd";
  2. or download this
    ssh hostname 'echo '\''test$ing'\'' | passwd -- bob'