Finds files by extension starting from the current working directory.

fnd.sh

#!/bin/sh
set -e

extensions=$*

main() {
    if [ -z "$extensions" ]; then
        find .
    else
        echo "find . $(build_find_command_arguments)" | sh
    fi
}

build_find_command_arguments() {
    args=""
    for ext in $extensions; do
        args="${args} -o -name '*.${ext}'"
    done
    echo $args | cut -c 4-
}

main