1#!/bin/bash
2
3print_usage()
4{
5    local script_name
6
7    # Get the script name
8    script_name=${0##*/}
9
10    # Echo usage info
11    echo " "
12    echo " "${script_name}
13    echo " "
14    echo " Usage:"
15    echo "   ${script_name} old_word new_word src_dir extension"
16    echo "  ${script_name} CHARACTER\(1\) CHARACTER netlib f"
17    echo " "
18
19    # Exit with non-zero exit status
20    exit 1
21}
22
23main()
24{
25    # Check the number of argements
26    if [ $# != "4" ]; then
27        print_usage
28    fi
29
30    # local variables
31    script_name=${0##*/}
32    old_word="$1"
33    new_word="$2"
34    src_dir="$3"
35    extension="$4"
36    one_tab="\t"
37
38    # Check src file
39    if [ ! -d "${src_dir}" ]; then
40        echo "${script_name}: Source directory does not exist (${src_dir})."
41        exit 1
42    fi
43
44     files="$(find ${src_dir} -name "*.${extension}")"
45#     echo "${files}"
46
47     for file in ${files}; do
48         echo "Replacing ... ${file}"
49         tmp_file=$(echo "${file}.back")
50         /bin/cp -f ${file} ${tmp_file}
51         sed "s/${old_word}/${new_word}/g" "${file}" > ${tmp_file} && /bin/mv ${tmp_file} "${file}"
52         /bin/rm -f ${tmp_file}
53     done
54     return 0
55}
56
57main "$@"
58