source: dynamico_lmdz/aquaplanet/LMDZ5/libf/grid/dimension/makdim

#!/bin/bash
#set -xv

# sanity check: do we have the required argument ?
if (( $# < 1 )) || (( $# > 3 ))
then
    echo "Wrong number of parameters in $0 !!!"
    echo " Usage:"
    echo "  $0 [im] [jm] lm"
    echo " where im, jm and lm are the dimensions"
    exit 1
fi

if (($1 % 8 != 0)) && (( $# == 3 ))
then
    echo "The number of longitudes must be a multiple of 8."
    echo "See the files dyn3d/groupe.F and dyn3dmem/groupe_loc.F."
    exit 1
fi

# build "fichnom", the relevant 'dimensions.im.jm.lm' file name
for i in $*
do
    list=$list.$i
done
fichdim=dimensions${list}

if [ ! -f $fichdim ]
then
#    echo "$fichdim does not exist"

    # assign values of im, jm and lm
    if [ $# -ge 3 ]
    then
        im=$1
        jm=$2
        lm=$3
        ndm=1
    elif [ $# -ge 2 ]
    then
        im=1
        jm=$1
        lm=$2
        ndm=1
    elif [ $# -ge 1 ]
    then
        im=1
        jm=1
        lm=$1
        ndm=1
    fi

# since the file doesn't exist, we create it
    cat << EOF > $fichdim
!-----------------------------------------------------------------------
!   INCLUDE 'dimensions.h'
!
!   dimensions.h contient les dimensions du modele
!   ndm est tel que iim=2**ndm
!-----------------------------------------------------------------------

      INTEGER iim,jjm,llm,ndm

      PARAMETER (iim= $im,jjm=$jm,llm=$lm,ndm=$ndm)

!-----------------------------------------------------------------------
EOF

fi

# remove 'old' dimensions.h file (if any) and replace it with new one
if [ -f ../dimensions.h ] ; then
    \rm ../dimensions.h
fi
tar cf - $fichdim | ( cd .. ; tar xf - ; mv $fichdim dimensions.h )
# line above is a trick to preserve time of creation of dimensions.h files