# time perl -ne 'print if 5 .. 10' maillog
Nov 11 04:19:28 ...
Nov 11 04:19:28 ...
Nov 11 04:19:28 ...
Nov 11 04:19:28 ...
Nov 11 04:19:28 ...

real    0m1.206s
user    0m0.773s
sys     0m0.432s
# time perl -ne 'print if 5 .. 10; last if $. > 10' maillog
Nov 11 04:19:28 ...
Nov 11 04:19:28 ...
Nov 11 04:19:28 ...
Nov 11 04:19:28 ...
Nov 11 04:19:28 ...

real    0m0.013s
user    0m0.006s
sys     0m0.008s
#