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  1. or download this
    perl -pe /print/ ip_addr_file
  2. or download this
    perl -pi -e s/^/#/ if /66.11.10.20/' script_file
  3. or download this
    perl -pi -e "s/^/#/ if /`perl -pe /print/ ip_addr_file` /" script_file
  4. or download this
    :g/XXX/s/^\([^ ]*\) \([^ ]*\) \([^ ]*\) \([^ ]*\)/\1 \4 \3 \2/