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Full Discussion: How to extract xml attribute values using awk inline.?
Top Forums Shell Programming and Scripting How to extract xml attribute values using awk inline.? Post 302974855 by kchinnam on Sunday 5th of June 2016 12:05:15 AM
Old 06-05-2016
Aia, thanks for trying,, I knew a wicked one liner like you gave could do this..
Don, please check performance stats,, I am bash/awk lover,, we have work to do..

Code:
 
grep '<factories.*baseQueueName' resources.xml | perl -nle '@r=/(?:jndiN|baseQueueN|n)ame="([^"]+)/g and print join ",",@r[1,2,0]'

Code:
# 153 XML tag lines scanned from one resources.xml file. time <command> gives these stats
real    0m0.007s, user    0m0.004s, sys     0m0.002s  -- Perl solution OMG
real    0m0.028s, user    0m0.025s, sys     0m0.002s  -- Don's awk solution
real    0m0.928s, user    0m0.458s, sys     0m0.409s  -- My general public :-) solution. Why sys taking so long here! not fair.

is there a way to combine first regex '<factories.*baseQueueName' into second one as well?

I wonder if any basic shell commands like sed/awk/grep can match what you are able to do with perl.. I would love to see simplified awk solution to beat perl.
Last edited by kchinnam; 06-05-2016 at 01:10 AM.. Reason: more details
 

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LEARN ABOUT DEBIAN

gfxattr

GFXATTR(1)																GFXATTR(1)

NAME

       gfxattr - Manipulate extended attributes in Gfarm file system

SYNOPSIS

       gfxattr [ -s | -g | -l | -r ] [ -x ] [ -c | -m ] [ -f xattrfile ] file [ xattrname ]

DESCRIPTION

       gfxattr	manipulates  extended  attributes and XML extended attributes of a specified file.  An extended attribute consists of an attribute
       name and an attribute value, which are arbitrary strings.  An XML extended attribute is an  extended  attribute	having	an  XML  attribute
       value.  Since XML extended attributes have a different name space from extended attributes, the same attribute name can be used.

       When  the -x option is specified, XML extended attributes are manipulated.  It is possible to search XML extended attributes by XPath query
       using gffindxmlattr command.

       All files and directories in Gfarm file system can keep extended attributes.  When removing a file or directory,  the  associated  extended
       attributes are also removed.

       Either -s, -g, -l, or -r option should be specified.

OPTIONS

       -s     sets  a  new value with an extended attribute xattrname for a specified file.  With the -f option, the value can be specified by the
	      file xattrfile instead of by the standard input.	When neither -c nor -m option is specified, the extended attribute is  overwritten
	      if it is already set.

       -g     reads a value with an extended attribute xattrname for a specified file.

       -l     display a list of extended attributes for a specified file.

       -r     removes a extended attribute xattrname for a specified file.

       -x     manipulates XML extended attributes.

       -c     sets a new extended attribute if it is not set.  This option is used with the -s option.

       -m     modifies the extended attribute if there it is.  This option is used with the -s option.

       -f xattrfile
	      With  the  -s  option,  reads  an  extended  attribute from the specified xattrfile instead of from the standard input.  With the -g
	      option, writes the extended attribute to the specified xattrfile instead of to the standard output.

       -?     displays usage.

SEE ALSO

       gffindxmlattr(1)

Gfarm								  18 August 2009							GFXATTR(1)
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