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https://askubuntu.com/questions/22381/how-to-format-a-usb-flash-drive

The Command-Line Way
In case you can't get your device formatted from the GUI, try this way.

Open the Terminal (Ctrl + Alt + T)

List your block storage devices by issuing the command lsblk
Then identify your pen drive by it's SIZE. In my case its /dev/sdb

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# Convertir columna a string
total_rows['ColumnID'] = total_rows['ColumnID'].astype(str)

# Eliminar filas cuyo valor para la columna A son nan
df.dropna(subset=['A'])

# Distribucion de valores para una cierta columna
events['city'].value_counts()

# Chequear si una columna tiene algun valor null

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crontab -e    Editar archivo de crontab, crea uno nuevo si no existe
crontab -l    Listar tareas crontab
crontab -r    Eliminar archivo con las tareas crontab
crontab -v    Muestra la ultima vez que se edito el archvio de crontab

*     *     *   *    *        command to be executed
-     -     -   -    -
|     |     |   |    |
|     |     |   |    +----- day of week (0 - 6) (Sunday=0)
|     |     |   +------- month (1 - 12)

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[
	{ "keys": ["ctrl+shift+f"], "command": "reindent" , "args": { "single_line": false } },
	{ "keys": ["ctrl+shift+c"], "command": "toggle_comment", "args": { "block": false } },
	{ "keys": ["ctrl+h"], "command": "find_all",
		 "context": [{"key": "panel", "operand": "find_in_files"}, {"key": "panel_has_focus"}]
	},
	{ "keys": ["ctrl+h"], "command": "show_panel", "args": {"panel": "find_in_files"} },
	{ "keys": ["ctrl+shift+r"], "command": "show_overlay", "args": {"overlay": "goto", "show_files": true} },
]

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See git help of a specyfic command

git help stash

Delete old already pushed commits

git reset --hard HEAD~x // Elimina los ultimos x+1 commits
git push -f

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yum install vsftpd ftp -y

vi /etc/vsftpd/vsftpd.conf

[...]
## Disable anonymous login ##
anonymous_enable=NO

## Uncomment ##
ascii_upload_enable=YES

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# First we need to get the modeline string for xrandr
# Luckily, the tool "gtf" will help you calculate it.
# All you have to do is to pass the resolution & the-
# refresh-rate as the command parameters:
gtf 1920 1080 60

# In this case, the horizontal resolution is 1920px the
# vertical resolution is 1080px & refresh-rate is 60Hz.
# IMPORTANT: BE SURE THE MONITOR SUPPORTS THE RESOLUTION

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Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

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• View all services

systemctl 

systemctl list-units --type=service
OR
systemctl --type=service

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package com.tbotalla.dniparser;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.LuminanceSource;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.pdf417.PDF417Reader;
import org.apache.commons.lang3.StringUtils;

import javax.imageio.ImageIO;