divide
Purpose: This program takes a data set as input and divides it into a maximum of 99 subfiles. Its main purpose is to allow one to write out a large data set from UNIX to a multi-volume external device.
To run, enter: divide a b c d
where
- a is the input data
- b is the desired size of each subfile (the last subfile can be smaller than the others)
- c is the logical record length
-
d is the number of logical records
- a.01 is the first output file (if a.01 already exists the program writes to a.01.01).
- a.02 is the second output file, etc.
For example, to divide up the 1990 STF3C data into four subfiles enter:
divide 3c_dat 5000 19900 16200
The result will be a file 3c_dat.01 of 5000 records, file 3c_dat.02 of 5000 records, file 3c_dat.03 of 5000 records, and file 3c_dat.04 of 1200 records.
Notes:
-
To run in the background, add an ampersand to the run
statement:
divide 3c_dat 5000 19900 16200 &
-
If data are compressed, the data can be piped in from a
decompression program. You will need to use the dividecomp version
of the utility to do this.
zcat /usr/pops/d3/stf/1990/3c/3c_dat.Z | dividecomp 5000 19900 16200 &
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