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HTML 

              
                <div class="container-fluid">
	<div class="row">
		<div class="col-sm-12" id="app">
			<h1>Calculadora chmod</h1>
			<small><a target="_blank" href="https://parzibyte.me/blog">parzibyte.me/blog</a></small>
			<div class="form-group">
				<input placeholder="Escribe el nombre del archivo o directorio" v-model="nombreArchivo" class="form-control" type="text">
			</div>
			<label for="conDirectorio">
				<input v-model="conDirectorio" type="checkbox" id="conDirectorio"> ¿Es un directorio?
			</label>
			<label for="conSudo">
				<input v-model="conSudo" type="checkbox" id="conSudo"> ¿Con sudo?
			</label>
			
			<br>
			<strong>Nota: puedes hacer click en Dueño, Grupo o Resto del mundo para seleccionar los 3 permisos</strong>
			<br>
			<span @click="marcarTodosLosDe('owner')" class="badge badge-success cursor-manita">Dueño</span>
			<div class="form-group">
				<label for="ownerRead"><input v-model="permisos.owner.lectura" id="ownerRead" type="checkbox"> Lectura (r)</label>
				<label for="ownerWrite"><input v-model="permisos.owner.escritura" id="ownerWrite" type="checkbox"> Escritura (w)</label>
				<label for="ownerExecute"><input v-model="permisos.owner.ejecucion" id="ownerExecute" type="checkbox"> Ejecución (x)</label>
			</div>
			<span @click="marcarTodosLosDe('group')" class="badge badge-warning cursor-manita">Grupo</span>
			<div class="form-group">
				<label for="groupRead"><input v-model="permisos.group.lectura" id="groupRead" type="checkbox"> Lectura (r)</label>
				<label for="groupWrite"><input v-model="permisos.group.escritura" id="groupWrite" type="checkbox"> Escritura (w)</label>
				<label for="groupExecute"><input v-model="permisos.group.ejecucion" id="groupExecute" type="checkbox"> Ejecución (x)</label>
			</div>
			<span @click="marcarTodosLosDe('all')" class="badge badge-danger cursor-manita">Resto del mundo</span>
			<div class="form-group">
				<label for="allRead"><input v-model="permisos.all.lectura" id="allRead" type="checkbox"> Lectura (r)</label>
				<label for="allWrite"><input v-model="permisos.all.escritura" id="allWrite" type="checkbox"> Escritura (w)</label>
				<label for="allExecute"><input v-model="permisos.all.ejecucion" id="allExecute" type="checkbox"> Ejecución (x)</label>
			</div>
			<div class="form-group">
				<div class="alert alert-success">
					<strong>El comando con números octales es:</strong>
					<br>
					<code>{{comando}}</code>
					<br>
					<strong>Y con letras:</strong>
					<br>
					<code>{{comandoConLetras}}</code>
				</div>
			</div>
			
		</div>
		<p>
			Referencia: <a target="_blank" href="https://es.wikipedia.org/wiki/Chmod">Wikipedia</a>
		</p>
	</div>
</div>
!

CSS 

              
                .cursor-manita{
	cursor: pointer;
}
!

JS 

              
                new Vue({
	el: "#app",
	watch: {
		conDirectorio(){
			this.generar();
		},
		conSudo(){
			this.generar();
		},
		nombreArchivo(){
			this.generar();
		},
		permisos: {
			handler(valor){
				this.generar();
			},
			deep: true,
		}
	},
	data: () => ({
		comando: "",
		comandoConLetras: "",
		nombreArchivo: "",
		conSudo: false,
		conDirectorio: false,
		permisos: {
			owner: {
				lectura: false,
				escritura: false,
				ejecucion: false,
			},
			group: {
				lectura: false,
				escritura: false,
				ejecucion: false,
			},
			all: {
				lectura: false,
				escritura: false,
				ejecucion: false,
			},
		}
	}),
	methods: {
		marcarTodosLosDe(quien){
			for(let clave in this.permisos[quien]){
				if(this.permisos[quien].hasOwnProperty(clave)){
					this.permisos[quien][clave] = true;
				}
			}
		},
		generar(){
			let prefijoSudo = this.conSudo ? "sudo " : "",
				recursivo = this.conDirectorio ? "-R " : "",
				nombreArchivo = ` "${this.nombreArchivo}"`;
			let comandoOctal = prefijoSudo + "chmod " + recursivo + this.binarioAOctal(this.obtenerPermisoBinario("owner"));
			comandoOctal += this.binarioAOctal(this.obtenerPermisoBinario("group"));
			comandoOctal += this.binarioAOctal(this.obtenerPermisoBinario("all"));
			comandoOctal += nombreArchivo;
			this.comando = comandoOctal;
			
			let comandoConLetras = prefijoSudo + "chmod " + recursivo + "u=" + this.obtenerPermisoComoLetras("owner");
			comandoConLetras += ",g=" + this.obtenerPermisoComoLetras("group");
			comandoConLetras += ",o=" + this.obtenerPermisoComoLetras("all") + nombreArchivo;
			this.comandoConLetras = comandoConLetras;
		},
		binarioAOctal(binario){
			return parseInt(binario, 2).toString(8);
		},
		obtenerPermisoComoLetras(quien){
			let letras = "";
			let p = this.permisos[quien];
			if(p.lectura) letras+="r";
			if(p.escritura) letras+="w";
			if(p.ejecucion) letras+="x";
			return letras;
		},
		obtenerPermisoBinario(quien){
			let binario = "";
			let p = this.permisos[quien];
			binario += p.lectura ? "1" : "0";
			binario += p.escritura ? "1" : "0";
			binario += p.ejecucion ? "1" : "0";
			return binario;
		}
	}
});
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999px

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