From: Ralph Corderoy <ralph@inputplus.co.uk>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] text utility
Date: Wed, 30 Jul 2003 08:25:46 +0000 [thread overview]
Message-ID: <3828.3f264674.96335@blake.inputplus.co.uk> (raw)
In-Reply-To: <4e9a248eadf51083ac5d918159014eda@collyer.net>
Hi Geoff,
> One could use "pr -tn" instead of the little awk script, but the
> difference in speed really isn't that great. Reading a cached ~2.5MB
> file of ~250K lines,
>
> cpu% time awk '{print NR, $0}' test >/dev/null
> 2.85u 0.13s 3.53r awk {print NR, $0} test
> cpu% time pr -tn test >/dev/null
> 1.75u 0.13s 2.18r pr -tn test
Fair enough. Under AIX and Linux cat's a win. Using yes(1) so awk's
little work to do:
$ yes y | head -n 250000 | time awk '{print NR, $0}' >/dev/null
real 1.13
user 1.06
sys 0.01
$ yes y | head -n 250000 | time cat -n >/dev/null
real 0.08
user 0.05
sys 0.00
I used it heavily when doing ad-hoc queries on files with millions of
lines. But, like you say, if it's not present, it's no use.
Cheers,
--
Ralph Corderoy. http://inputplus.co.uk/ralph/ http://troff.org/
prev parent reply other threads:[~2003-07-30 8:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-21 11:45 pac
2003-07-21 11:52 ` boyd, rounin
2003-07-22 14:09 ` rog
2003-07-22 14:35 ` boyd, rounin
2003-07-22 16:43 ` rog
2003-07-22 23:28 ` Geoff Collyer
2003-07-23 15:05 ` rog
2003-07-23 18:42 ` Dan Cross
2003-07-24 9:19 ` matt
2003-07-28 8:47 ` Ralph Corderoy
2003-07-28 21:58 ` Geoff Collyer
2003-07-30 8:25 ` Ralph Corderoy [this message]
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