0:00:01.310,0:00:06.420
Bien, bienvenidos a la clase de hoy

0:00:04.440,0:00:08.760
que va a tratar el manejo de datos.

0:00:06.420,0:00:10.620
manejo de datos puede que

0:00:08.760,0:00:12.630
os suene algo raro pero

0:00:10.620,0:00:14.940
la idea básica del manejo de datos es

0:00:12.630,0:00:16.800
que, teniendo los datos en un formato,

0:00:14.940,0:00:18.930
quieres mostrarlos de forma diferente

0:00:16.800,0:00:20.820
es algo que pasa a menudo. No hablo

0:00:18.930,0:00:22.859
de algo similar a convertir imágenes sino

0:00:20.820,0:00:25.080
que es posible que tengas un archivo de

0:00:22.859,0:00:27.480
texto o un log y lo que quieres es verlo

0:00:25.080,0:00:29.429
en otro formato, en un

0:00:27.480,0:00:32.399
gráfico, o quieres ver estadísticas sobre

0:00:29.429,0:00:35.160
esos datos, cualquier cosa que coja un

0:00:32.399,0:00:37.110
conjunto de datos y los represente de otra

0:00:35.160,0:00:40.079
forma; eso es lo que llamaría manejo de

0:00:37.110,0:00:42.180
datos. Hemos visto ya algunos ejemplos de

0:00:40.079,0:00:43.739
este tipo de manejo de datos

0:00:42.180,0:00:45.750
con anterioridad en este semestre

0:00:43.739,0:00:48.000
básicamente cualquier uso de un

0:00:45.750,0:00:49.739
operador sobre pipe que ordene o coja

0:00:48.000,0:00:51.449
la salida de un programa y la introduzca

0:00:49.739,0:00:54.149
en otro programa, esto es manejo de datos

0:00:51.449,0:00:55.289
en cierta manera.

0:00:54.149,0:00:57.960
Lo que vamos a hacer en esta clase

0:00:55.289,0:00:59.850
es echar un vistazo a algunas formas [br]elegantes de

0:00:57.960,0:01:01.859
manejar datos y algunas

0:00:59.850,0:01:05.640
muy útiles.

0:01:01.859,0:01:06.990
Para llevar a cabo cualquier

0:01:05.640,0:01:09.000
manejo de datos lo que se necesita es

0:01:06.990,0:01:12.240
una fuente de datos sobre la que operar

0:01:09.000,0:01:14.400
en primer lugar y hay un gran número de

0:01:12.240,0:01:16.560
buenas muestras de ello.

0:01:14.400,0:01:18.930
Damos algunos ejemplos en la sección de

0:01:16.560,0:01:20.580
ejercicios del apartado de notas de la [br]clase de hoy

0:01:18.930,0:01:23.400
En esta en particular voy a

0:01:20.580,0:01:25.500
utilizar un log del sistema. Tengo un [br]servidor

0:01:23.400,0:01:27.180
ejecutándose en algún lugar de Holanda

0:01:25.500,0:01:29.750
porque parecía algo razonable en su

0:01:27.180,0:01:32.790
momento y, en ese servidor

0:01:29.750,0:01:34.380
corre un daemon de logging normal

0:01:32.790,0:01:36.630
que viene con el sistema Deeb.

0:01:34.380,0:01:39.030
Es un tipo estándar de

0:01:36.630,0:01:41.880
mecanismo de logging en Linux y [br]hay un comando

0:01:39.030,0:01:44.700
llamado journalctl en los sistemas Linux

0:01:41.880,0:01:46.439
que te permiten ver dicho log.

0:01:44.700,0:01:48.689
Así que lo que voy a hacer es

0:01:46.439,0:01:50.009
algunas modificaciones sobre dicho log[br]para ver

0:01:48.689,0:01:52.829
si puedo sacar algo interesante

0:01:50.009,0:01:56.280
de él. Veréis que si ejecuto

0:01:52.829,0:01:59.329
el comando el resultado es un montón de [br]datos

0:01:56.280,0:02:01.979
porque es un log que tiene

0:01:59.329,0:02:03.360
hay un montón de cosas en él, un montón

0:02:01.979,0:02:06.299
de cosas que han pasado en el servidor y

0:02:03.360,0:02:08.250
que se remontan a enero y

0:02:06.299,0:02:10.560
los logs van incluso más atras

0:02:08.250,0:02:12.120
hay mucha información así que

0:02:10.560,0:02:13.440
lo primero que vamos a hacer es tratar de

0:02:12.120,0:02:16.260
limitarla para que veáis

0:02:13.440,0:02:18.060
sólo parte del contenido. El comando [br]grep

0:02:16.260,0:02:19.830
es aquí el más adecuado así que vamos

0:02:18.060,0:02:23.220
a pasarlo a través del pipe y vamos

0:02:19.830,0:02:24.810
a llamar a SSH. Sobre SSH no hemos

0:02:23.220,0:02:26.760
hablado todavía pero es

0:02:24.810,0:02:28.560
una manera de acceder a ordenadores[br]de forma remota

0:02:26.760,0:02:30.780
usando la línea de comandos y en

0:02:28.560,0:02:32.190
particular lo que pasa cuando pones

0:02:30.780,0:02:34.080
un servidor público en Internet es que

0:02:32.190,0:02:35.700
un montón de gente de todo el mundo

0:02:34.080,0:02:37.530
intenta conectar, loguearse y

0:02:35.700,0:02:39.360
tomar el servidor. Si quieres

0:02:37.530,0:02:41.480
ver lo que esta gente intenta hacer

0:02:39.360,0:02:44.850
y demás, voy a hacer un grep por SSH

0:02:41.480,0:02:47.700
y veréis como rápidamente se

0:02:44.850,0:02:51.270
genera un montón de contenido,

0:02:47.700,0:02:55.980
al menos en teoría. Va a ir

0:02:51.270,0:02:58.650
lento ... ahí está. Esto genera toneladas

0:02:55.980,0:03:00.240
y toneladas de contenido y es

0:02:58.650,0:03:01.860
muy difícil incluso ver

0:03:00.240,0:03:05.070
qué está pasando, así que vamos a[br]observar

0:03:01.860,0:03:06.660
sólo los nombres de usuario con [br]los que la gente

0:03:05.070,0:03:09.780
intenta loguear en mi servidor, así [br]podéis ver

0:03:06.660,0:03:12.540
que en algunas de estas líneas pone[br]desconectado

0:03:09.780,0:03:14.940
desconectado por usuario inválido y

0:03:12.540,0:03:17.430
un nombre de usuario. Sólo quiero quedarme[br]con esas líneas,

0:03:14.940,0:03:19.080
es lo único que me interesa, voy a hacer

0:03:17.430,0:03:21.750
un cambio más aquí que, si

0:03:19.080,0:03:26.459
pensáis en cómo funciona esta pipeline,

0:03:21.750,0:03:29.160
si hago esto aquí conectado de esta manera

0:03:26.459,0:03:31.320
la pipeline del final lo que

0:03:29.160,0:03:33.420
hará es que mandará entero

0:03:31.320,0:03:36.209
el archivo de log a traves de la red a mi[br]máquina

0:03:33.420,0:03:38.250
y localmente ejecutará grep para mostrar[br]sólo

0:03:36.209,0:03:40.530
las líneas que contienen ssh y

0:03:38.250,0:03:42.150
localmente las filtrará todavía más.[br]Puede parecer

0:03:40.530,0:03:44.220
un poco ineficiente porque no me [br]importan

0:03:42.150,0:03:45.959
muchas de estas líneas y el site remoto

0:03:44.220,0:03:48.900
también está ejecutando una shell, [br]así que

0:03:45.959,0:03:51.510
lo que puedo hacer es ejecutar el

0:03:48.900,0:03:53.519
comando entero en el servidor

0:03:51.510,0:03:55.200
así que lo que os digo, el comando SSH

0:03:53.519,0:03:57.420
que quiero ejecutar en el servidor es[br]esta

0:03:55.200,0:04:01.230
pipeline de tres elementos y lo que

0:03:57.420,0:04:02.700
obtenga como resultado lo quiero mandar a[br]less ya

0:04:01.230,0:04:04.260
que lo que esta vez hace bien es

0:04:02.700,0:04:06.150
el mismo filtrado que hicimos antes pero

0:04:04.260,0:04:08.280
en el lado del servidor y

0:04:06.150,0:04:11.730
este sólo me va a mandar aquellas

0:04:08.280,0:04:13.290
líneas que me interesan para que

0:04:11.730,0:04:16.320
cuando las mande localmente a través del[br]programa

0:04:13.290,0:04:17.519
llamada less ... less es un paginador del[br]que veréis

0:04:16.320,0:04:19.290
algunos ejemplos, de hecho ya habéis visto

0:04:17.519,0:04:21.900
algunos, por ejemplo al

0:04:19.290,0:04:24.180
escribir man y algún otro comando que se [br]abre en

0:04:21.900,0:04:26.669
un paginador. Un paginador es una forma [br]práctica

0:04:24.180,0:04:27.389
de coger un extracto largo de cierto[br]contenido y adaptarlo

0:04:26.669,0:04:29.759
a la ventana de tu terminal

0:04:27.389,0:04:31.889
y permitirte avanzar,

0:04:29.759,0:04:33.150
retroceder y navegar por él para

0:04:31.889,0:04:36.120
que no avance por entero

0:04:33.150,0:04:37.409
por la pantalla, así que, si lo ejecuto

0:04:36.120,0:04:40.800
va a llevar un tiempo porque tiene que

0:04:37.409,0:04:42.919
analizar un montón de archivos de log,

0:04:40.800,0:04:45.930
en particular grep está rellenando un [br]buffer

0:04:42.919,0:04:46.919
lo que resulta ser relativamente

0:04:45.930,0:04:56.039
de poca ayuda

0:04:46.919,0:05:01.259
Podría hacer, veamos si esto

0:04:56.039,0:05:05.189
es más útil, ¿por qué no quiere

0:05:01.259,0:05:09.949
hacerme el favor? bien, voy a hacer trampa

0:05:05.189,0:05:09.949
un poco, no me hagáis caso

0:05:17.380,0:05:22.520
quizá la red va muy lenta,

0:05:20.570,0:05:27.140
son dos posibles razones, por suerte hay

0:05:22.520,0:05:30.470
arreglo porque antes he

0:05:27.140,0:05:33.080
ejecutado el siguiente comando y

0:05:30.470,0:05:34.340
lo que este comando hace es coger [br]la salida

0:05:33.080,0:05:36.560
de este otro comando y la anexa a un [br]archivo

0:05:34.340,0:05:38.660
local, en mi computadora, bien, así que [br]ejecuto

0:05:36.560,0:05:40.970
esto cuando llego a mi oficina y así

0:05:38.660,0:05:43.490
lo que esto hizo fue descargar todos

0:05:40.970,0:05:45.530
los logs de SSH que contenían

0:05:43.490,0:05:47.330
desconectado de, así que ahora los tengo[br]en local

0:05:45.530,0:05:49.070
lo cual es muy útil. Aquí está,

0:05:47.330,0:05:50.990
no hay razones para que abra el log entero

0:05:49.070,0:05:52.640
cada vez porque sé que ese

0:05:50.990,0:05:55.220
patrón del inicio es lo que me

0:05:52.640,0:05:57.260
interesa, por lo que echamos un vistazo

0:05:55.220,0:05:59.480
al SSH punto log y veréis que hay

0:05:57.260,0:06:01.760
montones y montones de líneas en

0:05:59.480,0:06:04.940
las que aparece desconectado de usuario[br]no válido

0:06:01.760,0:06:06.230
usuarios autenticados, etc. Bien, aquíe

0:06:04.940,0:06:08.870
están las líneas sobre las que tenemos que[br]trabajar

0:06:06.230,0:06:10.550
lo que también significa que más adelante

0:06:08.870,0:06:12.500
no tenemos que pasar por completo por este

0:06:10.550,0:06:16.220
proceso SSH, simplemente hacemos cat sobre[br]este archivo

0:06:12.500,0:06:18.080
y operamos sobre él directamente

0:06:16.220,0:06:21.680
puedo mostrar este paginador

0:06:18.080,0:06:23.720
así que si hago cat s al SSH punto log

0:06:21.680,0:06:25.220
y lo mando a less, me da una

0:06:23.720,0:06:28.850
página por la que puedo retroceder y [br]avanzar

0:06:25.220,0:06:30.560
quizá hacer esto un poco más pequeño para

0:06:28.850,0:06:33.320
poder recorrer el archivo, estropear el

0:06:30.560,0:06:36.260
archivo y puedo hacer esto que son

0:06:33.320,0:06:37.820
básicamente atajos de teclado de vim de[br]manera que control ] para

0:06:36.260,0:06:42.770
avanzar, control D para retroceder y

0:06:37.820,0:06:45.169
q para salir. Hay todavía un montón de

0:06:42.770,0:06:47.000
contenido y estas líneas contienen un

0:06:45.169,0:06:48.440
montón de basura en la que no estoy

0:06:47.000,0:06:50.030
interesado, lo que realmente quiero ver

0:06:48.440,0:06:52.610
es cuáles son estos nombres de usuario

0:06:50.030,0:06:55.790
y esta es la herramienta que vamos a

0:06:52.610,0:06:59.210
empezar a utilizar, llamada sent y que es

0:06:55.790,0:07:01.040
un editor de flujo que está modificado o

0:06:59.210,0:07:04.100
es una modificación de un programa [br]anterior

0:07:01.040,0:07:05.540
llamado edie que era un editor muy raro

0:07:04.100,0:07:12.320
que ninguno de vosotros probablemente

0:07:05.540,0:07:16.270
querrá utilizar, si, oh, tsp es el nombre

0:07:12.320,0:07:16.270
de la computadora remota a la que estoy [br]conectando

0:07:16.390,0:07:23.720
como he dicho un editor de flujo y

0:07:19.850,0:07:26.060
básicamente lo que te permite es cambiar

0:07:23.720,0:07:28.490
el contenido de un flujo, puedes pensar[br]que

0:07:26.060,0:07:29.870
es un poco como hacer cambios pero

0:07:28.490,0:07:30.410
en realidad es un completo lenguaje

0:07:29.870,0:07:33.440
de programación

0:07:30.410,0:07:35.180


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0:11:00.160,0:11:04.269


0:11:01.569,0:11:07.360


0:11:04.269,0:11:09.279


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