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Full Discussion: Sorting multi-column values from a specific file
Top Forums Shell Programming and Scripting Sorting multi-column values from a specific file Post 302455533 by agama on Wednesday 22nd of September 2010 12:19:03 AM
Old 09-22-2010
Snarfing the date/time makes it a bit more complicated as the value has a space inside of the quotes. So, rewriting things a bit to allow for multiple tokens within quotes consider this brute force parsing example. You can use the date/time value as you need to. This just prints it out when it finds it.

Code:

#!/usr/bin/env ksh

awk -v RS=">" '

        function snarf_vars( )           # capture all name=value pairs on the current line. 
        {
                delete var;
                gsub( " = ", "=" );             # easier to deal without spaces
                for( i = 1; i <= NF; i ++ )
                {
                        if( (x = split( $(i), a, "=" )) == 2 )
                        {
                                $(i) = a[2];
                                for( ; i <= NF; i++ )     # snarf up all tokens in the quotes
                                {
                                        var[a[1]] = var[a[1]] $(i) " ";    # capture next token
                                        if( match( $(i), /"$/ ) )             # this has ending quote 
                                        {
                                                gsub( "\"", "", var[a[1]] );  # one replace of all quotes (does not handle escaped quotes)
                                                break;
                                        }
                                }
                        }
                }
        }

        /DateTime/{
                snarf_vars();
                printf( "%s \n", var["DateTime"] );
        }

        /Percent/ {
                snarf_vars();
                if( var["Price"] )
                        printf( "%c %6.3f %6.3f%%\n", 65+(idx++), var["Price"], var["Percent"]);
        }' <test.xml

The function unsets the var array, so if you want the date/time value later you need to specifically save it or it will be gone. This also makes no attempt to preserve the whitespace that it might find between quotes; for your needs that'll be OK, but if you want to use this in other situations it might not do the job.

Hope this helps.
Last edited by agama; 09-22-2010 at 01:31 AM.. Reason: better, shorter, more simple, snarf function
 

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LEARN ABOUT DEBIAN

dp

DP(8)								     [nmh-1.5]								     DP(8)

NAME

       dp - parse dates 822-style

SYNOPSIS

       /usr/lib/mh/dp [-form formatfile] [-format string] [-width columns] [-version] [-help] dates ...

DESCRIPTION

       Dp  is  a  program that parses dates according to the ARPA Internet standard.  It also understands many non-standard formats, such as those
       produced by TOPS-20 sites and some UNIX sites using ctime(3).  It is useful for seeing how nmh will interpret a date.

       The dp program treats each argument as a single date, and prints the date out in the official 822-format.  Hence, it  is  usually  best	to
       enclose each argument in quotes for the shell.

       To  override  the  output  format  used by dp, the -format string or -format file switches are used.  This permits individual fields of the
       address to be extracted with ease.  The string is simply a format string and the file is simply a format file.  See  mh-format(5)  for  the
       details.

       Here is the default format string used by dp:

	    %<(nodate{text})error: %{text}%|%(putstr(pretty{text}))%>

       which  says  that  if an error was detected, print the error, a `:', and the date in error.  Otherwise, output the 822-proper format of the
       date.

FILES

       $HOME/.mh_profile	  The user profile

PROFILE COMPONENTS

       None

SEE ALSO

       ap(8), Standard for the Format of ARPA Internet Text Messages (RFC-822)

DEFAULTS

       `-format' default as described above
       `-width' default to the width of the terminal

CONTEXT

       None

BUGS

       The argument to the -format switch must be interpreted as a single token by the shell that invokes dp.  Therefore, one must  usually  place
       the argument to this switch inside quotes.

MH.6.8								   11 June 2012 							     DP(8)
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