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<p class="MsoNormal">Muthu,<o:p></o:p></p>
<p class="MsoNormal">The syntax of the linux date command you are looking for is<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">date -d “now -3 days” +%d%b%Y<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">You can also do things like<o:p></o:p></p>
<p class="MsoNormal">date -d “14:52 3/26/2019 +1 day -3 hours” (I think I got that right)<o:p></o:p></p>
<p class="MsoNormal">or <o:p></o:p></p>
<p class="MsoNormal">date -d “$MYTIME -3 days”<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I like to also use -u (UTC time). If not, you can sometimes get unexpected results if there is a daylight saving time shift.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Clay<o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> gradsusr <gradsusr-bounces@gradsusr.org> <b>On Behalf Of
</b>Muthuvel Chelliah - NOAA Federal<br>
<b>Sent:</b> Monday, October 19, 2020 4:26 PM<br>
<b>To:</b> GrADS Users Forum <gradsusr@gradsusr.org>; Muthuvel Chelliah - NOAA Federal <muthuvel.chelliah@noaa.gov><br>
<b>Subject:</b> [EXTERNAL] Re: [gradsusr] shell command within grads script<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">Semyon, Jeff,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">Thanks for the replies.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">a) I know that the date command with the options I had asked, will give the<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">result at the grads command line with a ! before that command.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">b) I also know the second round about way my manipulating the output<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">from the q time output (but how to do few days ago?).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">I was only curious if there was a way from a) above, of possibly storing <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">that output in a variable as part of a grads script variable itself.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">I guess, it is difficult, and not doable!! <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">Thanks again<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">Muthu<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">------------------------------------------------</span><o:p></o:p></p>
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<p class="MsoNormal">Dr. Muthuvel Chelliah, eMail: <a href="mailto:Muthuvel.Chelliah@noaa.gov" target="_blank">
Muthuvel.Chelliah@noaa.gov</a><o:p></o:p></p>
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<p class="MsoNormal">Rm. 3008, Climate Prediction Center, Ph: (301) 683-3393<o:p></o:p></p>
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<p class="MsoNormal">NCEP/NWS/NOAA/U.S.Dept.of Commerce,<o:p></o:p></p>
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<p class="MsoNormal">5830, University Research Court, NCWCP,<o:p></o:p></p>
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<p class="MsoNormal">College Park, MD 20740<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Oct 19, 2020 at 4:54 PM Jeff Duda <<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">You can try prompting the linux command with "!" and hopefully the script recognizes the result and stores it properly.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I see that you're attempting to do something that would require lots of code in a grads script, but hopefully you know that you can query the valid time of data using 'q time' and parse the data using the 'sublin()', 'subwrd()', and 'substr()'
functions internal to GrADS' scripting language.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Jeff Duda<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Oct 19, 2020 at 1:56 PM Muthuvel Chelliah - NOAA Federal <<a href="mailto:muthuvel.chelliah@noaa.gov" target="_blank">muthuvel.chelliah@noaa.gov</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">Hello folks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">How can I set the result of the following linux shell command<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">to a variable (time_var) within a Cola grads script? which can be assigned<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">to set time command, via 'set time 'time_var<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">date -d "3 days ago" +%d%b%Y<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">Thanks<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana",sans-serif">Muthu<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">------------------------------------------------</span><o:p></o:p></p>
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<p class="MsoNormal">Dr. Muthuvel Chelliah, eMail: <a href="mailto:Muthuvel.Chelliah@noaa.gov" target="_blank">
Muthuvel.Chelliah@noaa.gov</a><o:p></o:p></p>
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<p class="MsoNormal">Rm. 3008, Climate Prediction Center, Ph: (301) 683-3393<o:p></o:p></p>
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<p class="MsoNormal">NCEP/NWS/NOAA/U.S.Dept.of Commerce,<o:p></o:p></p>
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<p class="MsoNormal">5830, University Research Court, NCWCP,<o:p></o:p></p>
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<p class="MsoNormal">College Park, MD 20740<o:p></o:p></p>
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<p class="MsoNormal">_______________________________________________<br>
gradsusr mailing list<br>
<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__gradsusr.org_mailman_listinfo_gradsusr&d=DwMFaQ&c=ApwzowJNAKKw3xye91w7BE1XMRKi2LN9kiMk5Csz9Zk&r=MCVOJjv6bEVvd32JcHviwqWEO1jfc2ilpIJQx1HJAL8&m=CSXUJVKg7cXRszgP6eeZxH3PPppu4VYEfemzbEdDmzQ&s=ZjS3R7TZ-YNlDQ7tfdIuWhsFdSjSAUb1yUy80lew300&e=" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><o:p></o:p></p>
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-- <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">Jeff Duda, Research Scientist</span><o:p></o:p></p>
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<p class="MsoNormal">University of Colorado Boulder<o:p></o:p></p>
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<p class="MsoNormal">Cooperative Institute for Research in Environmental Sciences<o:p></o:p></p>
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<p class="MsoNormal">NOAA/OAR/ESRL/Global Systems Laboratory<br>
<span style="font-size:10.0pt">Boulder, CO</span><o:p></o:p></p>
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<p class="MsoNormal">_______________________________________________<br>
gradsusr mailing list<br>
<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
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