NAME

       ncrcat - netCDF Record Concatenator

SYNTAX

       ncrcat  [-3]  [-4]  [-6]  [-7]  [-A]  [--bfr  sz][-C][-c][--cnk_byt  sz][--cnk_dmn  nm,sz]
       [--cnk_map map] [--cnk_min sz]  [--cnk_plc  plc]  [--cnk_scl  sz][-D  dbg_lvl]  [-d  dim,[
       min][,[  max]][,[  stride[[,[  subcycle]]]]]  [-F]  [-G  gpe_dsc]  [-g  grp[,...]]  [--glb
       att_name= att_val]] [-h] [--hdr_pad sz] [-L dfl_lvl] [-l path] [--mro] [--msa]  [-n  loop]
       [--no_tmp_fl]  [-O]  [-p  path]  [--ppc  var1[,  var2[,...]]=  prc]] [-R] [-r] [--ram_all]
       [--rec_apn] [-t thr_nbr] [--unn] [-v var[,...]]  [-X box] [-x] input-files output-file

DESCRIPTION

       ncrcat concatenates record variables across an arbitrary number of input files.  The final
       record  dimension  is  by  default  the sum of the lengths of the record dimensions in the
       input files.

       Input files may vary in  size,  but  each  must  have  a  record  dimension.   The  record
       coordinate,  if  any,  should  be monotonic (or else non-fatal warnings may be generated).
       Hyperslabs of the record dimension which include more than one file are handled correctly.
       ncra  supports  the  stride  argument  to the -d hyperslab option for the record dimension
       only, stride is not supported for non-record dimensions.

       ncrcat applies special rules to ARM convention time fields (e.g., time_offset).

EXAMPLES

       Concatenate files 85.nc, 86.nc,  ...  89.nc along the  record  dimension,  and  store  the
       results in 8589.nc:
              ncrcat 85.nc 86.nc 87.nc 88.nc 89.nc 8589.nc
              ncrcat 8[56789].nc 8589.nc
              ncrcat -n 5,2,1 85.nc 8589.nc
       These three methods produce identical answers.

       Assume the files 85.nc, 86.nc,  ...  89.nc each contain a record coordinate time of length
       12 defined such that the third record in 86.nc contains data from March  1986,  etc.   NCO
       knows  how to hyperslab the record dimension across files.  Thus, to concatenate data from
       December, 1985--February, 1986:
              ncrcat -d time,11,13 85.nc 86.nc 87.nc 8512_8602.nc
              ncrcat -F -d time,12,14 85.nc 86.nc 87.nc 8512_8602.nc
       The file 87.nc is superfluous, but does not cause an error.  The -F turns on  the  Fortran
       (1-based) indexing convention.

       The  following  uses  the stride option to concatenate all the March temperature data from
       multiple input files into a single output file
              ncrcat -F -d time,3,,12 -v temperature 85.nc 86.nc 87.nc 858687_03.nc

       Assume the time coordinate is incrementally numbered such  that  January,  1985  =  1  and
       December,  1989  = 60.  Assuming ??  only expands to the five desired files, the following
       concatenates June, 1985--June, 1989:
              ncrcat -d time,6.,54. ??.nc 8506_8906.nc

CAVEAT

       ncrcat does not re-scale packed  data  (i.e.,  data  stored  using  the  scale_factor  and
       add_offset  attributes  recommended  by the Unidat and CF conventions.  ncrcat just copies
       the data  directly  from  the  input  files.   It  copies  the  relevant  metadata  (i.e.,
       scale_factor  and  add_offset  attributes)  from  the  first file.  Concatenating multiple
       datasets packed with different scales  is  beyond  its  capabilities  (concatenating  data
       packed with the same scales in multiple files works fine).  The workaround for cases where
       the scales change among files is to first unpack the data in all  the  file  using  ncpdq,
       then to concatenate the unpacked data using ncrcat, and finally to repack the result using
       ncpdq.

AUTHOR

       NCO manual pages written by Charlie Zender and originally formatted by Brian Mays.

REPORTING BUGS

       Report bugs to <http://sf.net/bugs/?group_id=3331>.

COPYRIGHT

       Copyright © 1995-2016 Charlie Zender
       This is free software; see the source for copying conditions.  There is NO  warranty;  not
       even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SEE ALSO

       The  full  documentation  for  NCO is maintained as a Texinfo manual called the NCO User's
       Guide.  Because NCO is mathematical in nature, the  documentation  includes  TeX-intensive
       portions   not  viewable  on  character-based  displays.   Hence  the  only  complete  and
       authoritative versions of the NCO  User's  Guide  are  the  PDF  (recommended),  DVI,  and
       Postscript   versions  at  <http://nco.sf.net/nco.pdf>,  <http://nco.sf.net/nco.dvi>,  and
       <http://nco.sf.net/nco.ps>,  respectively.   HTML  and  XML  versions  are  available   at
       <http://nco.sf.net/nco.html> and <http://nco.sf.net/nco.xml>, respectively.

       If the info and NCO programs are properly installed at your site, the command

              info nco

       should give you access to the complete manual, except for the TeX-intensive portions.

HOMEPAGE

       The NCO homepage at <http://nco.sf.net> contains more information.

                                                                                        NCRCAT(1)