thin command

thin - thins "state" calls from log files

thin [factor=] [word=]

thin prints out the file that arrives from stdin with the exception that any commands like

ISO_DATE state ...
ISO_DATE done state ...

Are pared down by the factor (number > 0) entered on the command line. A factor of 0 removes all state lines.

You can change state to another keyword by the word= command line option.