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AIX 4.2 Korn shell and grep question

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Operating Systems AIX AIX 4.2 Korn shell and grep question
# 8  
Old 11-06-2008
Quote:
Originally Posted by Browser_ice
If there are empty fields (meaning "...,aaa,,bbb,..." instead of "...,aa,xxx,bbb,...) won't the grep count 2 commas instead of 1 with the [^,]* ?
No. As i have elaborated on above the "[^,]" means "anything, but a comma", therefore a comma is the last thing that could be matched by it. Additionally the "*" means "zero or more occurrences". For example "ab*c" would be matched not only by "abc" and "abbbc" but also by "ac". It would not be matched by "adc" though.

Quote:
Originally Posted by Browser_ice
The records look like this:
x(xx,x,x,,,x,x,9999,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999, . . .

So to test it I simply tried with grep "^\([^,]*,\)\{7\}9999" but found nothing.
hm, that is quite astonishing. I tried exactly your data and command and it is working (here on cygwin, but that shouldn't matter):

Code:
bakunin@cygwin ~/tmp$ cat test.asc
x(xx,x,x,,,x,x,9999,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
x(xx,x,x,,,x,x,8888,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,

bakunin@cygwin ~/tmp$ grep "^\([^,]*,\)\{7\}8888" test.asc
x(xx,x,x,,,x,x,8888,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,

bakunin@cygwin ~/tmp$ grep "^\([^,]*,\)\{7\}9999" test.asc
x(xx,x,x,,,x,x,9999,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,

bakunin@cygwin ~/tmp$ grep "^\([^,]*,\)\{33\}999" test.asc
x(xx,x,x,,,x,x,9999,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
x(xx,x,x,,,x,x,8888,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,

bakunin@cygwin ~/tmp$ grep --version
grep (GNU grep) 2.5.1

Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

by the way: i have edited the thread title so that it can easier be searched for. I hope you don't mind.
bakunin
Last edited by bakunin; 11-06-2008 at 05:27 PM..
# 9  
Old 11-06-2008
Just tried the "grep --version" and it did not produce the same output as you.

It just gave the usual grep response when it does not recognize an option and lists the general usage syntax.
# 10  
Old 11-06-2008
Quote:
Originally Posted by bakunin
[...]command and it is working (here on cygwin, but that shouldn't matter)[...]
bakunin@cygwin ~/tmp$ grep --version
grep (GNU grep) 2.5.1

Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[/code]

[... ]
Beside the AIX grep there is a second supported grep version from the IBM Linux Toolbox. I would not be suprised if those two grep programms differ just as many others like "find" "make" etc. do Smilie
# 11  
Old 11-07-2008
Ok, i retried it on AIX - same result as in Cygwin:

Code:
bakunin@aix_5_2:/tmp> cat test.asc
x(xx,x,x,,,x,x,9999,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
x(xx,x,x,,,x,x,8888,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
bakunin@aix_5_2:/tmp> grep "^\([^,]*,\)\{7\}9999" test.asc
x(xx,x,x,,,x,x,9999,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
bakunin@aix_5_2:/tmp> grep "^\([^,]*,\)\{7\}8888" test.asc
x(xx,x,x,,,x,x,8888,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
bakunin@aix_5_2:/tmp> grep "^\([^,]*,\)\{33\}999" test.asc
x(xx,x,x,,,x,x,9999,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
x(xx,x,x,,,x,x,8888,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
bakunin@aix_5_2:/tmp> what /usr/bin/grep
/usr/bin/grep:
        61      1.14  src/bos/usr/ccs/lib/libc/__threads_init.c, libcthrd, bos520 7/11/00 12:04:14
        46      1.72.2.3  src/bos/usr/bin/grep/grep.c, cmdscan, bos52L, l2005_19B0 4/14/05 04:52:19

I could test with other versions of AIX, but i suppose there would be no difference. Is in your data any non-printing character or something like that? have you tried the command outside of the script? Maybe its one of these "obvious" yet hard to find things one tends to think about always last.

I hope this helps.

bakunin
# 12  
Old 11-10-2008
Quote:
Originally Posted by bakunin
Ok, i retried it on AIX - same result as in Cygwin:

Code:
bakunin@aix_5_2:/tmp> cat test.asc
x(xx,x,x,,,x,x,9999,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
x(xx,x,x,,,x,x,8888,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
bakunin@aix_5_2:/tmp> grep "^\([^,]*,\)\{7\}9999" test.asc
x(xx,x,x,,,x,x,9999,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
bakunin@aix_5_2:/tmp> grep "^\([^,]*,\)\{7\}8888" test.asc
x(xx,x,x,,,x,x,8888,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
bakunin@aix_5_2:/tmp> grep "^\([^,]*,\)\{33\}999" test.asc
x(xx,x,x,,,x,x,9999,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
x(xx,x,x,,,x,x,8888,,x,,,xx,,,xxxx,,,,,,,,,,,,,,,,,,999,
bakunin@aix_5_2:/tmp> what /usr/bin/grep
/usr/bin/grep:
        61      1.14  src/bos/usr/ccs/lib/libc/__threads_init.c, libcthrd, bos520 7/11/00 12:04:14
        46      1.72.2.3  src/bos/usr/bin/grep/grep.c, cmdscan, bos52L, l2005_19B0 4/14/05 04:52:19

I could test with other versions of AIX, but i suppose there would be no difference. Is in your data any non-printing character or something like that? have you tried the command outside of the script? Maybe its one of these "obvious" yet hard to find things one tends to think about always last.

I hope this helps.

bakunin
There are no non-printing characters and I did those tests on the command line.

I did a what /usr/bin/grep and got (typed it as no way of copy/paste):
46 1.59 src/bos/usr/bin/grep/grep.c, cmdscan, box420, 9613T 12/19/95 08:22:09
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