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Old 08-25-2011, 10:06 PM   #1
915086731
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Why I get no output after execute "awk '/[0-9]{4}/' fan_get.txt " ?

Hello, my question comes with the following code:
Code:
[river@localhost CLI010001]$ cat  fan_get.txt 
Source                                          Speed              Status              Mode
-------------------------------------------------------------------------------------------------------
PS A,Virtual Fan Group #1                       3600 RPM           Normal              Internal
PS A,Virtual Fan Group #1,Fan #1                2700 RPM           Normal
PS A,Virtual Fan Group #1,Fan #2                4300 RPM           Normal
PS A,Virtual Fan Group #1,Fan #3                3000 RPM           Normal
PS A,Virtual Fan Group #1,Fan #4                4300 RPM           Normal
PS A,Virtual Fan Group #1,Fan #5                3000 RPM           Normal
PS A,Virtual Fan Group #1,Fan #6                4700 RPM           Normal
PS A,Virtual Fan Group #1,Fan #7                2800 RPM           Normal
PS A,Virtual Fan Group #1,Fan #8                4400 RPM           Normal
PS B,Virtual Fan Group #2                       3500 RPM           Normal              Internal
PS B,Virtual Fan Group #2,Fan #1                2500 RPM           Normal
PS B,Virtual Fan Group #2,Fan #2                4000 RPM           Normal
PS B,Virtual Fan Group #2,Fan #3                2500 RPM           Normal
PS B,Virtual Fan Group #2,Fan #4                4300 RPM           Normal
PS B,Virtual Fan Group #2,Fan #5                2800 RPM           Normal
PS B,Virtual Fan Group #2,Fan #6                4500 RPM           Normal
PS B,Virtual Fan Group #2,Fan #7                3100 RPM           Normal
PS B,Virtual Fan Group #2,Fan #8                4400 RPM           Normal
-------------------------------------------------------------------------------------------------------

[river@localhost CLI010001]$ awk '/[0-9]{4}/' fan_get.txt 
[river@localhost CLI010001]$
Why I get no output after execute "awk '/[0-9]{4}/' fan_get.txt " ? I think many lines match it, e.g. 4400, 3100 ... ,
 
Old 08-25-2011, 11:24 PM   #2
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Code:
[river@localhost CLI010001]$ awk '/[0-9]\{4\}/' fan_get.txt
[river@localhost CLI010001]$
Does it means that awk does not support all the regular expression rules ?
 
Old 08-25-2011, 11:27 PM   #3
anomie
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Is this gawk(1) or mawk(1)? Check -
Code:
$ awk -W version
- if you are unsure.

If it's gawk(1), then turn on Posix via:
Code:
$ awk --posix '/[0-9]{4}/' foo.txt
 
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Old 08-26-2011, 12:28 AM   #4
grail
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The other alternative is that by default awk does not enable intervals so you can also use --re-interval. Also, if you have upgraded to version 4+ this is now in by default.
 
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Old 08-26-2011, 06:09 AM   #5
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Code:
[river@localhost CLI010004]$  awk --re-interval '/[0-9]{4}/' fan_output4.txt 
PS A,Virtual Fan Group #1                       8500 RPM           Normal              External          [52]
PS A,Virtual Fan Group #1,Fan #1                7800 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #2                9100 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #3                7600 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #4                9400 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #5                7500 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #6                9500 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #7                7700 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #8                9700 RPM           Normal                                [52]
PS B,Virtual Fan Group #2                       8700 RPM           Normal              External          [52]
PS B,Virtual Fan Group #2,Fan #1                9600 RPM           Normal                                [52]
PS B,Virtual Fan Group #2,Fan #2                7700 RPM           Normal                                [52]
PS B,Virtual Fan Group #2,Fan #3                9800 RPM           Normal                                [52]
PS B,Virtual Fan Group #2,Fan #4                7800 RPM           Normal                                [52]
PS B,Virtual Fan Group #2,Fan #5                9400 RPM           Normal                                [52]
PS B,Virtual Fan Group #2,Fan #6                7700 RPM           Normal                                [52]
[river@localhost CLI010004]$  awk --posix '/[0-9]{4}/' fan_output4.txt 
PS A,Virtual Fan Group #1                       8500 RPM           Normal              External          [52]
PS A,Virtual Fan Group #1,Fan #1                7800 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #2                9100 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #3                7600 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #4                9400 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #5                7500 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #6                9500 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #7                7700 RPM           Normal                                [52]
PS A,Virtual Fan Group #1,Fan #8                9700 RPM           Normal                                [52]
PS B,Virtual Fan Group #2                       8700 RPM           Normal              External          [52]
PS B,Virtual Fan Group #2,Fan #1                9600 RPM           Normal                                [52]
PS B,Virtual Fan Group #2,Fan #2                7700 RPM           Normal                                [52]
PS B,Virtual Fan Group #2,Fan #3                9800 RPM           Normal                                [52]
PS B,Virtual Fan Group #2,Fan #4                7800 RPM           Normal                                [52]
PS B,Virtual Fan Group #2,Fan #5                9400 RPM           Normal                                [52]
PS B,Virtual Fan Group #2,Fan #6                7700 RPM           Normal                                [52]
[river@localhost CLI010004]$
Thanks, I should add "--posix" or "--re-interval".
Does "--posix" equals to "--re-interval" ?
 
Old 08-26-2011, 06:10 AM   #6
915086731
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[river@localhost CLI010004]$ awk -W version
GNU Awk 3.1.8
Copyright (C) 1989, 1991-2010 Free Software Foundation.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
[river@localhost CLI010004]$ [river@localhost CLI010004]$ awk --re-interval '/[0-9]{4}/' fan_output4.txt
bash: [river@localhost: command not found...
Failed to search for file: Invalid input passed to daemon: char '[' in text!
[river@localhost CLI010004]$
 
Old 08-26-2011, 08:36 AM   #7
grail
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This page might help with regards to options.
 
  


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