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Full Discussion: Awk program for calculating dates.
Top Forums Shell Programming and Scripting Awk program for calculating dates. Post 302537208 by nua7 on Thursday 7th of July 2011 11:23:30 AM
Old 07-07-2011
Awk program for calculating dates.
Hi All,
I have a txt file which has hundreds of lines and 41 fields. I have a requirement to pick up field 14 from the text file which is a date fiels in the following format.

Field 14 :
Data Type : NUMERIC DATE (YYYYMMDD)
Field Length : 8
Example of Data :20090415

Field 42 :
Data Type : NUMERIC DATE (YYYYMMDD)
Field Length : 8
Example of Data :20090715


I need to add 3 months to the date and add a new field as field 42 in the txt file.

This needs to be done for every line and there is no delimiter in the text file.

Any ideas would be appreciated.
 

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LEARN ABOUT REDHAT

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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