Shell Programming and Scripting

"Barcode","Device Name", "ACSL".

awk -v columns="Barcode,Device Name,ACSL" '
BEGIN {
  c=split(columns, headers, ",");
  for (i=1; i<=c; i++) labels[headers[i]]=headers[i];
}
{
 for (i=1; i<=NF; i++) {
    key=$i;
    sub("=.*", "", key);
    if (key in labels) {
       key=$i;
       sub("=.*", "", key);
       value=$i;
       sub(key "=", "", value);
       data[NR, key]=value;
    }
 }
}
END {
 print columns;
 for (i=1; i<=NR; i++) {
    line="";
    for (j=1; j<=c; j++) {
       line=line data[i, headers[j]] ",";
    }
    sub(",$", "", line);
    if (line ~ /..*,..*,..*/) print line;
 }
}
' FS="\n" RS="\n\n" file2.txt > file2.csv