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Full Discussion: Awk
Top Forums Shell Programming and Scripting Awk Post 42477 by Simerian on Thursday 30th of October 2003 05:06:50 AM
Old 10-30-2003
Some thoughts...

1) First things first, how do you identify 87 your fields? Are they delimited or positional?
2) Do you now which fields are dates? If not you will probably have to match against a regexp to determine the field format and decide whether it is a date but this is dodgy because of the slim chance of mistaken identity.
3) Are all the original date formats the same? Same situation as (2), altering the manipulation code.
4) Are all the dates 2000+?
5) You could use split to divide the field into mm/dd/yy then change the year and reconstitute.
6) As a tangent, you could also do the job with a sed single substitute command if all the dates are the same original format and 2000+ but the single line command could match other non-date fields which happen to resemble the form of the fields you want to change.
 

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LEARN ABOUT SUNOS

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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