nodeの関数をbashシェルで使えるようにする。 ref: http://qiita.com/takuya_1st/items/11b9b79d16ccbb3aed40

file2.txt

bash> echo  'aaa=1&bb=あああ'  | encodeURIComponent| decodeURIComponent | querystring.parse
{ aaa: '1', bb: 'あああ' } 

file3.txt

bash> echo  'aaa=1&bb=あああ'  | encodeURIComponent| decodeURIComponent | querystring.parse
{ aaa: '1', bb: 'あああ' } 

node2bash.js

#!/usr/bin/env node
/***
 * author takuya_1st
 * Released under  GPL Licenses.
 * Date: 2013-11-21 2:06
 */
var fs   = require('fs')
var path = require('path');
var name = process.argv[1];
var str  = process.argv[2];

//モジュールの処理
if( name.match(/\./) ){
    module_name = path.basename( name.split(/\./).shift()) ;
    name = name.split(/\./).pop();
    if( global[module_name] ){
      module = global[module_name];
    }else{
      module = require(module_name);
    }
}else {
    name =  path.basename(name);
    module = global;
}
//コマンドシェルで実行したい関数
var func = module[name];



if(str) {
    if(fs.existsSync(str)){
        str = fs.readFileSync(str);
    }
    str  = func(str);
    console.log(str);
}else{
    process.stdin.resume();
    process.stdin.setEncoding('utf8');

    var lines = []
        // 標準入力がくると発生するイベント
        process.stdin.on('data', function (chunk) {

                lines.push(chunk.trim())
                });
    // EOFがくると発生するイベント
    process.stdin.on('end', function () {
            lines = lines.join("\n")
            console.log( func(lines)  )
            });

}

sample1

bash> git clone https://gist.github.com/f5a6fb560dc357835122.git
bash> chmod +x node2bash.js
bash>  ln -s node2bash.js /usr/local/bin/encodeURIComponent
bash>  ln -s node2bash.js /usr/local/bin/decodeURIComponent
bash>  ln -s node2bash.js /usr/local/bin/querystring.parse

sample2

bash>  encodeURIComponent 'aaa=1&bb=あああ'
aaa%3D1%26bb%3D%E3%81%82%E3%81%82%E3%81%82

sample3

bash > encodeURIComponent 'aaa=1&bb=あああ' | decodeURIComponent
aaa=1&bb=あああ