[erlang-questions] os:cmd performance

[Jon Schneider]

> os:cmd("cat /tmp/huge_file | grep 'some_regexp' | sort -u >
> /tmp/output_file").

Never understood why so many people do cat file | something instead of
something <file .

(At least SunOS's cat has been known to mmap instead so would no doubt
differ in chunkiness of reads.)

grep 'some_regexp' /tmp/huge_file or even grep 'some_regexp' </tmp/huge_file

Doesn't explain your discrepancy though.

Jon