If you are like me, you have to dig through some log files to research some errors. The ../var/nagios.log file has alot of data and unfortunately the times stamps are not exactly friendly to read.
[1256314960] EXTERNAL COMMAND: PROCESS_SERVICE_CHECK_RESULT;hostname;servicename;0;Service running OK
Using a little perl command line magic we can convert that ugly timestamp into something more readable.
[Fri Oct 23 11:22:40 2009] EXTERNAL COMMAND: PROCESS_SERVICE_CHECK_RESULT;hostname;servicename;0;Service running OK
Just use...
perl -pe 's/(\d+)/localtime($1)/e' nagios.logOf course that will spew the entire log. So using grep or tail, you can make it a bit more useful.
perl -pe 's/(\d+)/localtime($1)/e' nagios.log |grep server1
tail nagios.log | perl -pe 's/(\d+)/localtime($1)/e'
注意，这条perl命令不会修改源文件，如果希望修改源文件，请先复制一份，然后 >>new file