05-03-2019
What shell are you using?
What version of that shell are you using?
What diagnostic messages are printed when you try running your script?
If you are looking for "$str1" = "RTG" AND "$str2" = "TD8", why is your code looking for "$str1" = "DTP" OR "$str2" = "D8"? And, on that if statement do you think some of the diagnostics you are seeing might be because you didn't separate the arguments with spaces?
There seem to be two different date output formats you want to produce, but your code doesn't seem to make any attempt to distinguish between the two. Is the output that you want incorrectly displayed, or have you just not bothered to try to figure out which output format should be produced when looking at the input line?
You say you want a date 15 days ago, but there is nothing in your code that attempts to print anything but today's date. There are lots of threads here that deal with date calculations. Have you searched through them to find a method that meets your needs? (Again, we need to know what shell and what version of that shell you are using!)
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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)