Log Message:

Field and condition are checked separately

  # usage: pkg_grep_summary <FIELD> <CONDITION>
  # examples:
  #   pkg_grep_summary 'PKGNAME' '$2 ~ /judy/' \
  #         < /srv/pkgsrc/pkg_src_summary.txt
  #   pkg_grep_summary 'DEPENDS' '$2 ~ /pkg_summary/' \
  #         < /srv/pkgsrc/pkg_src_summary.txt