A script need help Post: 303039407

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Top Forums Shell Programming and Scripting A script need help Post 303039407 by green_k on Thursday 3rd of October 2019 08:53:00 AM

10-03-2019

Registered User

Quote:

Originally Posted by Chubler_XL

And another awk approach:

Code:

awk -v want="VALUE1,VALUE2,VALUE3" -F'[=\\][]' '
function prnsection(i) {
   if(length(section)) {
     printf "%s",section;
     for(i=1;i in keypos;i++) {
       printf " %s", keys[keypos[i]]
       keys[keypos[i]]="MISSING"
     }
     printf "\n"
   }
}
BEGIN {
   for(i=split(want, keypos, ",");i;i--) {
       keys[keypos[i]]="MISSING";
   }
}
NF>2 { prnsection(); section=$0 }
$1 in keys { keys[$1]=$0 };
END { prnsection() }' infile

Hi Chubler_XL, thanks for your answer. it works fine. since I am relatively new for unix/awk scripting. I am not able to fully understand the code. below is my understanding about this code, some part I don't know how it works and have some questions. could you please review and give me brief explanation

thanks in advance.

Code:

awk -v want="RECORD_COUNT,VALUE2,VALUE3" -F'[=\\][]' '  --- F'[=\\][]' need to understand how the regular exp works.. 
function prnsection(i) {                                --- function pass arg i in
   if(length(section)) {                                --- if section is not empty do following
     printf "%s",section;                               --- print section
     for(i=1;i in keypos;i++) {                         --- for loop, max i is number of array keypos: keypos[value1]=1, keypos[value2]=2, keypos[values3]=3 
       printf " %s", keys[keypos[i]]                    --- array keys elements are: keys[1]=value1, keys[2]=value2, key[3]=value2 
       keys[keypos[i]]="MISSING"                        --- if array keys element doens't have value , assign value "missing"
     }                                                 
     printf "\n"
   }
}
BEGIN {
   for(i=split(want, keypos, ",");i;i--) {              --- create array keypos element based on variable want
       keys[keypos[i]]="MISSING";                       --- create array keys if keys is empty then assign value missing.
   }
}
NF>2 { prnsection(); section=$0 }                       ---if NF> 2  then call function and assign $0 to section. the function has one 
                                                                                    --- argument, but here is empty, 
														---how the value be passed in?	
														---what's the purpose to call this function?
$1 in keys { keys[$1]=$0 };                             --- first my understanding is $1 is VALUE1, VALUE2..., I tried command, with -F'[=\\][]' 
                                                                           ----as delimiter, NF=1, not sure how it works. 
END { prnsection() }' file                              ---here call the function to print result..

green_k

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LEARN ABOUT X11R4

xkbaddgeomrow

XkbAddGeomRow(3)						   XKB FUNCTIONS						  XkbAddGeomRow(3)

NAME

       XkbAddGeomRow - Add a row to a section

SYNOPSIS

       XkbRowPtr XkbAddGeomRow ( section, sz_keys )
	     XkbSectionPtr section;
	     int sz_keys;

ARGUMENTS

       - section
	      section to be updated

       - sz_keys
	      number of keys to be reserved

DESCRIPTION

       Xkb  provides functions to add a single new element to the top-level keyboard geometry. In each case the num_ * fields of the corresponding
       structure is incremented by 1. These functions do not change sz_* unless there is no more room in the array. Some of these  functions  fill
       in  the	values	of the element's structure from the arguments. For other functions, you must explicitly write code to fill the structure's
       elements.

       The top-level geometry description includes a list of geometry properties.  A geometry property associates  an  arbitrary  string  with	an
       equally	arbitrary  name.  Programs  that display images of keyboards can use geometry properties as hints, but they are not interpreted by
       Xkb. No other geometry structures refer to geometry properties.

       One of the components of a keyboard geometry section is one or more rows of keys.  XkbAddGeomRow adds one row  to  the  specified  section.
       The  newly created row contains space for the number of keys specified in sz_keys.  They are allocated and zeroed, but otherwise uninitial-
       ized.  XkbAddGeomRow returns NULL if any of the parameters is empty or if it was not able to allocate space for the row. To allocate  space
       for an arbitrary number of rows to a section, use the XkbAllocGeomRows function.

STRUCTURES

       typedef struct _XkbRow {
	       short	       top;
	       short	       left;
	       unsigned short  num_keys;
	       unsigned short  sz_keys;
	       int	       vertical;
	       XkbKeyPtr       keys;
	       XkbBoundsRec    bounds;
       } XkbRowRec, *XkbRowPtr;

SEE ALSO

       XkbAllocGeomRows(3)

X Version 11							   libX11 1.2.1 						  XkbAddGeomRow(3)