Prototype: data_readstringarrayidx(filename, comment, split, maxentries, maxbytes)

Return type: data

Description: Returns a data container (array) with up to maxentries fields from the first maxbytes bytes of file filename.

One dimension is separated by the regex split, the other by the lines in the file. The array arguments are both integer indexes, allowing for non-identifiers at first field (e.g. duplicates or names with spaces), unlike data_readstringarray().

The comment field will strip out unwanted patterns from the file being read, leaving unstripped characters to be split into fields. Using the empty string ("") indicates no comments.


  • filename: string - File name to read - in the range: "?(/.*)
  • comment: string - Regex matching comments - in the range: .*
  • split: string - Regex to split data - in the range: .*
  • maxentries: int - Maximum number of entries to read - in the range: 0,99999999999
  • maxbytes: int - Maximum bytes to read - in the range: 0,99999999999



echo a,b,c > /tmp/cfe_array
echo "# This is a comment" >> /tmp/cfe_array
echo d,e,f >> /tmp/cfe_array
echo g,h,i >> /tmp/cfe_array
echo "# This is another comment" >> /tmp/cfe_array
echo j,k,l >> /tmp/cfe_array


body common control
      bundlesequence => { "example" };

bundle agent example
      # The comment regex warrents an explination:
      # # matches the character # literally
      # [^\n]* match a single character not including the newline character
      # between zero and unlimited times, as many times as possible
      "bykey" data => data_readstringarray("/tmp/cfe_array","#[^\n]*",",",10,400);
      "byint" data => data_readstringarrayidx("/tmp/cfe_array","#[^\n]*",",",10,400);

      "bykey_str" string => format("%S", bykey);
      "byint_str" string => format("%S", byint);
      "By key: $(bykey_str)";
      "specific element by key a, offset 0: '$(bykey[a][0])'";
      "By int offset: $(byint_str)";
      "specific element by int offset 2, 0: '$(byint[2][0])'";



R: By key: {"a":["b","c"],"d":["e","f"],"g":["h","i"],"j":["k","l"]}
R: specific element by key a, offset 0: 'b'
R: By int offset: [["a","b","c"],["d","e","f"],["g","h","i"],["j","k","l"]]
R: specific element by int offset 2, 0: 'g'

See also: data_readstringarray(), data


  • Added in CFEngine 3.6.0