>perl -wMstrict -le
"my $s =
  q{cd / ; /path/latest --van --args \"fName='foo';jobCode=12;jobId=34;\" < j1.R > j1.txt};
 print qq{'$s'};
 ;;
 my $d_quo = qr{ \" [^^\"]* (?: \\. [^\"]*)* \" }xms;
 ;;
 $s =~ s{ $d_quo (*SKIP)(*FAIL) | ; }{&&}xmsg;
 print qq{'$s'};
"
'cd / ; /path/latest --van --args "fName='foo';jobCode=12;jobId=34;" < j1.R > j1.txt'
'cd / && /path/latest --van --args "fName='foo';jobCode=12;jobId=34;" < j1.R > j1.txt'