Shell function to search specific files for a pattern (augmented grep)

fxg.sh

# Common pattern for searching file contents
fxg () {

    local OPTIND=1 findbase=. grepflags verbose=false usage=false

    while getopts b:g:vh opt; do
        case $opt in
            b) findbase=$OPTARG ;;
            g) grepflags=$OPTARG ;;
            v) verbose=true ;;
            h) usage=true ;;
        esac
    done
    [[ -n $grepflags ]] &&
        grepflags=-$grepflags
    shift $(($OPTIND - 1))
    if [[ $# -ne 2 ]] || $usage; then
        cat >&2 <<'.'
Usage: fxg [options] <find glob> <grep pattern>
    -b <base> - Base directory for search
    -g <flags> - Flags to be passed to grep
    -v - Provide verbose output
    -h - Print this usage summary
.
        return
    fi

    if $verbose; then
        echo "finding $1 in $findbase containing \"$2\" with grep flags" \
             "$grepflags" >&2
    fi

    find "$findbase" -name "$1" |
    xargs grep $grepflags "$2"

}