Change character encoding to UTF-8

This is an second version of 文字コードをまとめて変換するスクリプト - Shammerism. The before article handles multiple files at one time, but this version handles only 1 file.

#!/bin/bash
NKF_CHECK=`which nkf | wc | awk '{print $1}'`;
if [ $NKF_CHECK -eq  1 ];then
    echo "Checking nkf is ok.";
else
    echo "$0 requires nkf but nkf is not installed or path missing. Check the nkf state.";
    exit 1;
fi
if [ $# = 1 ];then
    CUR=`nkf --guess $1 | awk '{print $1}'`
    if [ $CUR = "UTF-8" -o $CUR = "ASCII" ];then
	echo "Encode of $1 is $CUR. Do nothing.";
    else
	echo "Change $1's encode from $CUR to UTF-8.";
	mv $1 $1.$CUR;
	iconv -f ${CUR} -t UTF-8 $1.$CUR > $1;
    fi
else
    echo "Usage: $0 filename"
fi