Hi everybody,

can anyone send me
tac (reverse of cat) as pure executable for HP-UX 10.20
Could not find it anywhere in the web.

Thanks in advance, Paul

Paul Bullack wrote:
> Hi everybody,
>
> can anyone send me
> tac (reverse of cat) as pure executable for HP-UX 10.20
> Could not find it anywhere in the web.
>
> Thanks in advance, Paul
>

Hi,

I don't know where you can find a 10.20 tac binary. However, I dug up this
list of different ways to do a reverse cat that I compiled years ago.

-Ian

======

These are roughly arranged from most to least portable:

# These two methods are both POSIX.2 portable and work on large
# files, and are also faster than using awk or sed:
pr -tn | sort -nr | cut -f2-
nl -ba | sort -nr | cut -f2-

# I haven't actually tried this one yet...
ex -s '%g/^/m0|%p|q!' # to stdout
ex -s '%g/^/m0|w!|q!' # update original file

# Most implementations of awk can handle bigger files than sed.
# Note: On HP-UX 11, awk aborts if the input file contains any lines
# longer than 3000 characters. Method A below is considerably faster
# than method B:
awk '{l[NR]=$0} END{for (i=NR;i;i--) print l[i]}' # method A
awk '{x=$0"\n"x} END{ORS="";print x}' # method B

# Just be aware that most seds will choke on big files using the
# below methods (in older ones the limit can be as small as 4k,
# and even POSIX.2 requires only 8k). On HP-UX 11.00, sed
# dumps core on files >2k (or >4k w/ sed cumulative patch PHCO_22760
# installed). The same exact bug exists in Solaris 7. sed is also
# much slower than awk. Method A below is about 33% faster than
# method B or C:
sed -n 'x;1!H;${g;p;}' # method A
sed -n '1!G;h;$p' # method B
sed '1!G;h;$!d' # method C

# nl is part of XPG2-4, but not POSIX; works fine w/ large files, and it
# is very fast:
nl -ba -w9 | sort -nr | cut -f2-

# in HP-UX 10.00 and later, Perl 4 is included (/usr/contrib/bin/perl);
# Perl imposes no limit on the size of the input file, and it is extremely
# fast:
perl -e 'print reverse <>'

# tac is part of the GNU textutils package, which does not come w/ HP-UX,
# but should come with many versions of Linux & BSD, as well as Solaris 8
# or later; it is one of the least portable, yet the speediest, way to
# perform the task:
tac

# the -r (reverse) option for the tail command is not a standard POSIX
# option, yet Solaris, AIX, Tru64, IRIX, Open UNIX, and most BSD variants
# all support it
tail -r

--
Posted via a free Usenet account from http://www.teranews.com

Hello Ian,

Thanks a lot for these interesting proposals, I will use one of them
instead of "no tac".

Paul

"Ian Springer" <hpux.faq@gmail.com> schrieb im Newsbeitrag
news:4570fb68$0$20521$88260bb3@free.teranews.com.. .
> Paul Bullack wrote:
>> Hi everybody,
>>
>> can anyone send me
>> tac (reverse of cat) as pure executable for HP-UX 10.20
>> Could not find it anywhere in the web.
>>
>> Thanks in advance, Paul
>>
>
> Hi,
>
> I don't know where you can find a 10.20 tac binary. However, I dug up this
> list of different ways to do a reverse cat that I compiled years ago.
>
> -Ian
>
> ======
>
> These are roughly arranged from most to least portable:
>
> # These two methods are both POSIX.2 portable and work on large
> # files, and are also faster than using awk or sed:
> pr -tn | sort -nr | cut -f2-
> nl -ba | sort -nr | cut -f2-
>
> # I haven't actually tried this one yet...
> ex -s '%g/^/m0|%p|q!' # to stdout
> ex -s '%g/^/m0|w!|q!' # update original file
>
> # Most implementations of awk can handle bigger files than sed.
> # Note: On HP-UX 11, awk aborts if the input file contains any lines
> # longer than 3000 characters. Method A below is considerably faster
> # than method B:
> awk '{l[NR]=$0} END{for (i=NR;i;i--) print l[i]}' # method A
> awk '{x=$0"\n"x} END{ORS="";print x}' # method B
>
> # Just be aware that most seds will choke on big files using the
> # below methods (in older ones the limit can be as small as 4k,
> # and even POSIX.2 requires only 8k). On HP-UX 11.00, sed
> # dumps core on files >2k (or >4k w/ sed cumulative patch PHCO_22760
> # installed). The same exact bug exists in Solaris 7. sed is also
> # much slower than awk. Method A below is about 33% faster than
> # method B or C:
> sed -n 'x;1!H;${g;p;}' # method A
> sed -n '1!G;h;$p' # method B
> sed '1!G;h;$!d' # method C
>
> # nl is part of XPG2-4, but not POSIX; works fine w/ large files, and it
> # is very fast:
> nl -ba -w9 | sort -nr | cut -f2-
>
> # in HP-UX 10.00 and later, Perl 4 is included (/usr/contrib/bin/perl);
> # Perl imposes no limit on the size of the input file, and it is extremely
> # fast:
> perl -e 'print reverse <>'
>
> # tac is part of the GNU textutils package, which does not come w/ HP-UX,
> # but should come with many versions of Linux & BSD, as well as Solaris 8
> # or later; it is one of the least portable, yet the speediest, way to
> # perform the task:
> tac
>
> # the -r (reverse) option for the tail command is not a standard POSIX
> # option, yet Solaris, AIX, Tru64, IRIX, Open UNIX, and most BSD variants
> # all support it
> tail -r
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>