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I have a unix program lets call it x that processes a file and takes the following parameters:
--fileName: just a text file name --firstLine: integer --lastLine: integer
so a typical invokation could be
x --fileName=foo --firstLine=50 --lastLine=100
this will read foo from line 5 to line 100 inclusive and produce do something with them

I want to call x few times with (--firstLine,--lastLine) like this

(1,1000) (1001,2000) ....

so effectively I am processing foo in chunks of 1000 lines

if I do this and foo has millions of lines the processing time will increase as I progress with the chunks because x is scanning foo to reach firstLine.

I cannot change x and want to write a Perl wrapper for x that reads foo from line 1 to the end and send every chunk of 1000 lines to x and this way I avoid scannig foo multiple times.

Is this possible?

update (broquaint): added formatting

In reply to splitting an input stream by Anonymous Monk

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