Shell Programming and Scripting

system( q@awk -F',' 'FNR==NR {buff[$1]=$0;next}
                  {
                     if(buff[$1]=="") { new[$1]=$0; next;}
                     if(buff[$1]==$0) { delete buff[$1]; next;}
                     if(buff[$1]!=$0) { chng[$1]=$0; delete buff[$1];}
                  }
                  END{
                     for (var in new) print new[var] > "/tmp/newrecs";
                     for (var in chng) print chng[var] > "/tmp/chngrecs";
                     for (var in buff) if(buff[var]!="") print buff[var] > "/tmp/delrecs";
                 }' /tmp/fuss_lsof_conf.txt /tmp/fuss_lsof_conf2.txt >/tmp/diff_fuss_file.txt@ );