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I have tried searching using man and in this forum, but i was not able to find the exact stuff, i want to split out a section of the log file with a given pattern. Say i would like to split a section with the date stamp of 22/11/06 - 23/11/06 How can this be done, do i have to use pipes with commands like head and tail, i have tried out the combination of head and tail but i am not able to set the pattern using grep. I tried but it splits the file into small chucks of fixed size, can anyone tell me how to split out a section into a new file from a 2 GB log file.
you could prefix the command with nice, which will give it a lower priority for CPU usage. Depending on your hardware, the IO will probably cause more load - the CPU is also used for IO, you can't nice that since it is done by the kernel.
However, whatever method you use, you'll HAVE to read the data from the file, so this is unavoidable. The only thing you can do it make sure you choose a method which reads the file once. The grep command above should only read the file once.