by gru.. » Thu, 04 Jul 2002 18:17:21
Why the multiple copies?
by Werner STEINMAN » Thu, 04 Jul 2002 19:13:31
: Why the multiple copies?
/usr/ucb is part of SunOS 4.x compatibility to SunOS 5.x,
Solaris support for XPG4 is under /usr/xpg4/bin
and the standard Solaris programs are e.g. in /usr/bin
because
there are difference between various versions of programs ...
Werner Steinmann
by Paul Flo » Fri, 05 Jul 2002 05:39:24
[snip]
Not to mention, you may also have /opt/sfw/bin/gsed.Quote:>> Why the multiple copies?
>man sed should explain the different versions. I think xpg4/bin/sed is
>a POSIX version. /usr/ucb/sed is the BSD version. /usr/bin/sed is the
>Solaris SVR4 version.
>Is this sort of thing new to you? Solaris has had these versions of
>various utilities for some time.
A bientot
Paul
--
Paul Floyd http://paulf.free.fr (for what it's worth)
What happens if you have lead in your pants as well as lead in your pencil?
Post follow-ups to comp.unix.questions, please.
| Is this simple or what: I want to erase the last 4 lines of a
| thousand files with variable length (I want to do more than
| that but I have succeded in the rest). I have tried $-4,$ d
| in sed (and many MANY variants of this) but it wont do.
| I have ended up using $ d (which works!!!) four times, but
| this makes my scripts long and the procces four times slower!!!
sed has no idea when it has reached $-4 or $-3, only when it has reached $.
Suggestion #1 -- if it must be done with sed, here goes:
sed '1N
2N
N
$d
P
D'
Under GNU sed and possibly under BSD sed, it will require a -n flag to
operate properly on files of three or fewer lines, but one wouldn't run it
on files that short anyway. -n won't hurt under System V, but it isn't
necessary, and no implementation of sed should need -n for files of four
lines or more.
Suggestion #2 -- forget sed:
ed - file << \FOOF
$-3,$ d
w
q
FOOF
[$-4,$ d would delete the last FIVE lines. Ranges are inclusive.]
Suggestion #3 -- some perl fan will write it in perl.
David W. Tamkin Box 59297 Northtown Station, Illinois 60659-0297
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