Operation Interview Questions

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Programming test: Please write a perl script “merge_tick_data.pl” to merge tick data files with identical format based on timestamp. “merge_tick_data.pl” takes location of two or more input tick data files as command line argument, merges and prints merged data to stdout. You can assume that all tick data are sorted in all input files. You are not allowed to use UNIX “sort” command. Each input tick data file could have several hundred gigabytes. You should optimize your solution for memory and CPU usage. E.g. File1.csv //timestamp,ticker,bid,ask 060001.926941,TOT,86.26,86.48 Phone interview questions: - What is 'bless'? How do you use it? - What is 'eval'? - What does 'map' do? - How do you use 'grep'? - several questions on regular expression - What Perl modules have you used from CPAN? - List five 2 word commands in Linux. - How do you find what port a process uses in Linux?
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Operation Specialist

Interviewed at Knight Capital

3.4
Oct 10, 2012

Programming test: Please write a perl script “merge_tick_data.pl” to merge tick data files with identical format based on timestamp. “merge_tick_data.pl” takes location of two or more input tick data files as command line argument, merges and prints merged data to stdout. You can assume that all tick data are sorted in all input files. You are not allowed to use UNIX “sort” command. Each input tick data file could have several hundred gigabytes. You should optimize your solution for memory and CPU usage. E.g. File1.csv //timestamp,ticker,bid,ask 060001.926941,TOT,86.26,86.48 Phone interview questions: - What is 'bless'? How do you use it? - What is 'eval'? - What does 'map' do? - How do you use 'grep'? - several questions on regular expression - What Perl modules have you used from CPAN? - List five 2 word commands in Linux. - How do you find what port a process uses in Linux?

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