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A comment on Pipeable Ruby - forget about grep / sed / awk / wc ... . Parent comment
rw@raccoon:~> du -h messages
19M messages
rw@raccoon:~> time grep -e "foobar" < messages
real 0m0.030s
user 0m0.022s
sys 0m0.008s
rw@raccoon:~> time pru /foobar/ < messages
real 0m0.796s
user 0m0.722s
sys 0m0.071s
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rw@raccoon:~> du -h messages
19M messages
rw@raccoon:~> time grep -e "foobar" < messages
real 0m0.030s
user 0m0.022s
sys 0m0.008s
rw@raccoon:~> time pru /foobar/ < messages
real 0m0.796s
user 0m0.722s
sys 0m0.071s