DB<226> $_=q{cd / ; /path/to/R/R_latest --vanilla --args "fName='rGSDPlan';jobCode=682718;jobId=6827181;" < job682718.R > job_6827181.txt}

  DB<227> s/("[^"]*")|;/ $1 or '&&' /ge
 => 2

  DB<228> $_
 => "cd / && /path/to/R/R_latest --vanilla --args \"fName='rGSDPlan';jobCode=682718;jobId=6827181;\" < job682718.R > job_6827181.txt"