parse lines

Anjan1 · February 23, 2012, 4:36am

I have file which is having 500 lines. I want to get the first 100 lines then sleep, then again next 100 lines sleep so now till the end of the file.

Can someone tell me in perl and bash.

also i want to do it in threads.

Thanks..

itkamaraj · February 23, 2012, 4:40am

 
awk '{if(NR%100){system("sleep 2")}}1' inputfile.txt

Anjan1 · February 23, 2012, 4:52am

Above code is getting sleep each line, i want it to sleep after 100 lines of output, and then sleep and then output next 100 lines etc.

Franklin52 · February 23, 2012, 6:03am

With a slight modification of the code of itkamaraj:

awk '{if(!(NR%100)){system("sleep 2")}}1' inputfile.txt

Anjan1 · February 23, 2012, 7:21am

Thanks it works. Can someone tell me how to do it in perl

---------- Post updated at 07:21 AM ---------- Previous update was at 07:09 AM ----------

Franklin52 can u tell me what NR% means in awk statement?

I found how do it in perl

knight_eon · February 23, 2012, 7:29am

NR is Special Variable in AWK which means Number of Line the process is on. Hence

NR%100

will give you the remainder of NR/100. So here, if NR is 101, the NR%100 will give 1 which will invalidate !(NR%100)

Anjan1 · February 23, 2012, 7:48am

Ok thanks, got it