source: TOOLS/PACK_IPSL/diff.bash @ 1879

#!/bin/bash
set -vx
#==============================================
#
# Usage:
# ./diff.bash f1.nc f1.nc
# ./diff.bash f1.nc f1_witherror.nc
#
# ./diff.bash fileA.nc fileB.nc 'var1,var2'
#
# ex: ./diff.bash file_ncrcat.nc file_cdocat.nc 'contfracATM'
#
#==============================================

if [ $# -eq 3 ] ; then
        delname="-delname,$3"
fi

cdo -s $delname $1 out_tmp1.nc
cdo -s $delname $2 out_tmp2.nc

cdo -s diff out_tmp1.nc out_tmp2.nc > diff_$$.tmp 2>&1
result2=`cat diff_$$.tmp | grep -i "records differ" | tr -s " " | cut -f2 -d" "`

if [ "$result2" = "0" ] ; then
        # EXIT_SUCCESS
        echo "Variables from netcdf files : "
        echo "$1"
        echo "$2" 
        echo "are the same"
        rm -f diff_$$.tmp out_tmp1.nc out_tmp2.nc
        exit 0
else
        # EXIT_FAILURE
        echo "Variables from netcdf files : "
        echo "$1"
        echo "$2" 
        echo "differ"   
        cat diff_$$.tmp | grep -i "records differ"
        rm -f diff_$$.tmp out_tmp1.nc out_tmp2.nc
        echo "==============> ERROR"
        exit 1 
fi