source: LMDZ6/branches/cirrus/libf/phylmd/ecrad/test/common/change_namelist.sh

#!/bin/bash
#
# (C) Copyright 2014- ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
#
# In applying this licence, ECMWF does not waive the privileges and immunities
# granted to it by virtue of its status as an intergovernmental organisation
# nor does it submit to any jurisdiction.

# Change entries in a Fortran namelist file
# Usage: change_namelist.sh infile.nam outfile.nam key1=value1 key2=value2 ...

INFILE=$1
OUTFILE=$2
shift
shift

SEDLINE=""
while [ "$1" ]
do
    FOUND=$(echo $1 | grep '=')
    if [ ! "$FOUND" ]
    then
        echo "Error in $0: argument '$1' not of the form key=value"
        exit 1
    fi
    KEY=$(echo $1 | awk -F= '{print $1}')
    VALUE=$(echo $1 | awk -F= '{print $2}')
    FOUND=$(grep $KEY $INFILE)
    if [ ! "$FOUND" ]
    then
        echo "Error: $KEY not found in $INFILE"
        exit 1
    fi

    SEDLINE="$SEDLINE -e s|^[[:space:]!]*"$KEY".*|"$KEY"="$VALUE",|"
    shift
done
echo sed $SEDLINE $INFILE ">" $OUTFILE
sed $SEDLINE $INFILE > $OUTFILE