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Top Forums UNIX for Beginners Questions & Answers Compare a date (mm/dd/yyyy) with awk Post 303035661 by oldman2 on Thursday 30th of May 2019 11:59:20 AM
Old 05-30-2019
Quote:
Originally Posted by vgersh99
convert MM/DD/YYYY to YYYYMMDD and compare numerically.
I thought about that but I do not have control on the date format in the file and its several thousand lines long. Do you have any suggestions on how to convert the date? Some of the other columns would have dates in them as well. But I am only worried about comparing the data in the 7th column right now and I will process the other dates later once I have narrowed down the file with this command.
 

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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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