8.3 MD Files - Copying and Deleting MD files
In this exercise, you will copy MD file data from one file to another on
the workstation and delete an MD file.
- Use the DMAP command to see if there
are any local MD files in the range 4000 to 4005.
- Type: DMAP MDXX400
If you already have MD files in this range, select another range of 6
files you can use. (try 4010-4015, then 4020-4025, etc).
- Create a local dataset name for the test MD files in the MYDATA group.
- Type: DSSERVE ADD MYDATA/TEST-PTSRCS MD 4000 4005
- Copy the contents of BLIZZARD/PTSRCS.4 to MYDATA/TEST-PTSRCS.1 (MD file 4000),
and change the file description to CASE STUDY.
- Type: PTCOPY BLIZZARD/PTSRCS.4 MYDATA/TEST-PTSRCS.1 DEL=YES TITLE='CASE STUDY'
- Once the PTCOPY is done, list the MD file headers to verify that the MD file was copied.
- Type: PTLIST BLIZZARD/PTSRCS.4 FORM=FILE
- Type: PTLIST MYDATA/TEST-PTSRCS.1 FORM=FILE
- In step 3, you copied all of the data available in BLIZZARD/PTSRCS.4 to
your local dataset.
You may also choose which data to copy by using the SELECT clause.
Copy just the 12Z mandatory upper air data from selected states
to position 2 of your local dataset (MD file 4001).
-
Type: PTCOPY BLIZZARD/UPPERMAND.1 MYDATA/TEST-PTSRCS.2
SEL='DAY 93072;TIME 12;ST MD,VA,NC,SC,GA'
- List the data that you just copied.
-
Type:PTLIST MYDATA/TEST-PTSRCS.2 PARAM=DAY TIME ST IDN NUM=ALL
Only data from the seven stations in the five states listed in step 6
should be included in the output.
- Since you won't be using MD file 4000 any longer, delete it.
- Type: MDU DEL 4000
