Provided by: pnetcdf-bin_1.9.0-2_amd64 
NAME
ncoffsets - print the starting/ending file offsets for netCDF variables
SYNOPSIS
ncoffsets [-h] | [-x] | [-sgr] [-v var1[,...]] file
DESCRIPTION
ncoffsets prints the file offsets information of variables defined in a given netCDF file. The ending
offsets reported is an exclusive offset, i.e. 1 byte more than the last byte occupied by the variable.
In other words, the ending offset is equal to the sum of starting offset and the variable size. For
record variables, only the offsets of first record are printed. Add option -r to print the offsets of all
records.
If no argument is given, command usage information is printed.
OPTIONS
-v var1[,...]
The output will include data values for the specified variables. One or more variables must be
specified by name in the comma-delimited list following this option. The list must be a single
argument to the command, hence cannot contain blanks or other white space characters. The named
variables must be valid netCDF variables in the input file. The default, without this option is
to include data values for all variables in the output.
-s Print the variable size in bytes. For record variables, only the size of one record is printed.
-g Print the gap in bytes from the previous variable. For the first defined variable, print the gap
from the end of file header. For record variables, there is no gap between records.
-r Output the offset information for all records of the selected record variables. Without this
option, only the offsets of first record are printed.
-x Check all fixed-size variable for file space gaps in between any two immediately adjacent
variables. It prints "1" on stdout if gaps are found, "0" for otherwise. This option disables all
other options.
-h Print the available command-line options
EXAMPLES
Print the file offset information for all variables in a netCDF file.
% ncoffsets -sg testfile.nc
netcdf test_double.nc {
//file format: CDF-1
file header:
size = 340 bytes
extent = 340 bytes
dimensions:
x = 100
y = 100
z = 100
time = UNLIMITED // (100 currently)
fixed-size variables:
double square(x, y):
start file offset = 340
end file offset = 80340
size in bytes = 80000
gap from prev var = 0
double cube(x, y, z):
start file offset = 80340
end file offset = 8080340
size in bytes = 8000000
gap from prev var = 0
record variables:
double time(time):
start file offset = 8080340 (record 0)
end file offset = 8081140 (record 0)
size in bytes = 8 (of one record)
gap from prev var = 0
double xytime(time, x, y):
start file offset = 8080348 (record 0)
end file offset = 16080348 (record 0)
size in bytes = 80000 (of one record)
gap from prev var = 0
}
Check if there are gaps in between two adjacent fixed-size variables.
% ncoffsets -x testfile.nc
0
SEE ALSO
pnetcdf(3)
DATE
19 Dec 2017