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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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ANNO(1)                                                              [nmh-1.5]                                                             ANNO(1)

NAME
anno - annotate messages SYNOPSIS
anno [+folder] [msgs] [-component field] [-inplace | -noinplace] [-date | -nodate] [-draft] [-append] [-list] [-delete] [-number [num|all]] [-preserve | -nopreserve] [-version] [-help] [-text body] DESCRIPTION
Anno manipulates header fields or annotations in messages. Header fields consist of a field name and an optional field body as defined by RFC-2822. The -component option specifies the field name, and the -text option specifies the field body. The messages are either the msgs in the named folder, or the draft if invoked with the -draft option. Usually, annotation is performed by the commands dist, forw, and repl, if they are given the -anno switch. This allows you to keep track of your distribution of, forwarding of, and replies to a message. By using anno, you can perform arbitrary annotations of your own. Each message selected will be annotated with the lines field: date field: body The -nodate switch inhibits the date annotation, leaving only the body annotation. By default, anno prepends the annotations to the message. Annotations are instead appended if the -append option is specified. If a -component field is not specified when anno is invoked, anno will prompt the user for the name of field for the annotation. The field specified must be a valid 2822-style message field name, which means that it may only consist of alphanumerics and dashes, The body specified is arbitrary text. Normally anno does the annotation inplace in order to preserve any links to the message. You may change this by using the -noinplace switch. The -list option produces a listing of the field bodies for header fields with names matching the specified component, one per line. The listing is numbered, starting at 1, if the -number option is also used. A tab character separates the number and the field body. The field body is treated as if it is a file name, and only the final path name component is listed. The complete field body is listed if the -text option is used, the contents of the text are ignored. The -delete option removes header fields from messages. The first header field whose name matches the component is deleted if no other options are specified. If the -text option is used in conjunction with the -delete option, the first header field whose name matches the component and whose body matches the text is deleted. The text is treated as if it was a file name; if it begins with a slash, the entire field body must match the text, otherwise just the last path name component of the field body must match. If the -number option is used in conjuction with the -delete option, header field num whose name matches the component is deleted. The number matches that which is pro- duced by the -list option. The special value all can be used for the number, and causes all components that match the name to be deleted. By default, anno changes the last-accessed and last-modified times on annotate messages to the time at which the annotation occurs. Anno preserves the original times if the -preserve option is used. A matching -nopreserve option exists that allows time preservation to be turned off if enabled in the profile. FILES
$HOME/.mh_profile The user profile PROFILE COMPONENTS
Path: To determine the user's nmh directory Current-Folder: To find the default current folder SEE ALSO
dist(1), forw(1), repl(1) DEFAULTS
`+folder' defaults to the current folder `msgs' defaults to cur `-inplace' `-date' CONTEXT
If a folder is given, it will become the current folder. The first message annotated will become the current message. MH.6.8 11 June 2012 ANNO(1)
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