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Full Discussion: Replace a field in a comma separated file
Top Forums UNIX for Beginners Questions & Answers Replace a field in a comma separated file Post 303044848 by H squared on Thursday 5th of March 2020 08:34:25 AM
Old 03-05-2020
Replace a field in a comma separated file
Hello Experts,

I have a sample comma separated file as having date data in field # 5 and field #8. Field # 4 and 7 (fields before the date field) are indicators:

This is just a sample data, the actual file may have n number of date fields.

Code:
29,A Store,A Street,1,111213,aaaa,0,891213
30,B Store,B Street,0,991213,aaaa,1,61213
31,C Store,C Street,1,51213,aaaaa,1,81213
32,D Store,D Street,0,0,aaaa,1,150323
33,E Store,E Street,1,121212,bbbb,0,0
34,F Store,F Street,1,101212,cccc,0,971212


I need to update field #5 (depending on the value in field # 4 (indicator field)) and field #8 (depending on the value in field#7) and so on as :

1. If field # 4 = 0 and field # 5 <> 0 (say data is : 991213), then append '19' to the string in field # 5 and make the final value
as : 1999-12-13. This is for years before 2000

2. If field # 4 = 0 and field # 5 = 0 (say data is : 0), then the final value as : 0001-01-01

3. If field # 4 = 1, then
a. check if field # 5 has length = 5, then (for data say: 51213), append '200' so that the final value should be 2011-12-13
b. Else, (for data say : 111213), append '20' so that the final value appears as : 2011-12-13.

Input parameters to the script :
$1 : file name
$2 , $3, ........ this depends on the number of date fields which need to be transformed.

I have written the following code:

Code:
#! /usr/bin/ksh

# Read File name
INPUT=$1

 while IFS=',' read -r f1 f2 f3 f4 f5 f6 f7 f8
 do 
 For Century = 0
  if [ $f4 -eq 0 -a $f5 -ne 0 ]
  then
      echo "19$f5" | sed 's/./&-/4;s/./&-/7' ;
  fi

 For 0 in date
  if [ $f4 -eq 0 -a $f5 -ne 0 ]
  then
      echo "00010101" | sed 's/./&-/4;s/./&-/7' ;
  fi

 for century = 1
  if [ $f4 -eq 1 ]
  then
      char_len=`expr length $f5`
      if [ $char_len -eq 5 ]
      then
         echo "200$f5" | sed 's/./&-/4;s/./&-/7';
      else
          echo "20$f5" | sed 's/./&-/4;s/./&-/7';
      fi
  fi

 done < "$INPUT"

I am able to transform the data for Field # 5 only.
Could you please suggest a better approach for this requirement such that I am able to transform the data for field # 8 as well.


Thank you
 

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LEARN ABOUT DEBIAN

gd_bof

gd_bof(3)							      GETDATA								 gd_bof(3)

NAME

       gd_bof -- report the start of data in a field

SYNOPSIS

       #include <getdata.h>

       off_t gd_bof(DIRFILE *dirfile, const char *field_code);

DESCRIPTION

       The gd_bof() function queries a dirfile(5) database specified by dirfile and returns the sample number of the beginning-of-field marker for
       the vector field given by field_code.

       The caller should not assume that the beginning-of-field marker falls on a frame boundary.  The beginning-of-field marker  is  never  nega-
       tive.

       For  a RAW field, the beginning-of-field corresponds to the frame offset of that field (see gd_frameoffset(3)).	The beginning-of-field for
       all other vector field type is the same as the beginning-of-field of whichever of its input fields that starts latest.	The  beginning-of-
       field marker for the special field INDEX is always zero.

       The beginning-of-field marker for a field containing no data is in the same location as, or after, its end-of-field marker (see gd_eof(3)).
       For a RAW field, the difference between the locations of the beginning- and end-of-field markers indicates the number of  samples  of  data
       actually stored on disk.

       The dirfile argument must point to a valid DIRFILE object previously created by a call to gd_open(3).

RETURN VALUE

       Upon successful completion, gd_bof() returns the sample number of the end-of-field marker for the indicated field.  On error, it returns -1
       and sets the dirfile error to a non-zero error value.  Possible error values are:

       GD_E_BAD_CODE
	       The field specified by field_code or one of the fields it uses as input was not found in the database.

       GD_E_BAD_DIRFILE
	       The supplied dirfile was invalid.

       GD_E_BAD_REPR
	       The representation suffix specified in field_code, or in one of its inputs was not recognised.

       GD_E_DIMENSION
	       A scalar field was found where a vector field was expected in the definition of field_code or one of its inputs, or else field_code
	       itself specified a scalar field.

       GD_E_RECURSE_LEVEL
	       Too  many levels of recursion were encountered while trying to resolve field_code.  This usually indicates a circular dependency in
	       field specification in the dirfile.

       The dirfile error may be retrieved by calling gd_error(3).  A descriptive error string for the last error encountered can be obtained  from
       a call to gd_error_string(3).

SEE ALSO

       dirfile(5), dirfile-encoding(5), gd_open(3), gd_eof(3), gd_error(3), gd_error_string(3), gd_nframes(3)

Version 0.7.0							  15 October 2010							 gd_bof(3)
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