Linux Mint: How to fix Genymotion error `CXXABI_1.3.8' not found

5 Steps to fix it:

LD_LIBRARY_PATH=/usr/local/lib64/:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.9 g++-4.9

How to disable monitor standby in Linux

To check if your video card support DPMS just run
xset q
and see the result:
You should get something similar to this output:
DPMS (Energy Star):
Standby: 1200 Suspend: 1800 Off: 2400
DPMS is Enabled
Monitor is On

To disable these settings just run:

xset dpms 0 0 0

Or disable DPSM with
xset -dpms

Run again
xset q
to check the new settings

If you to make these settings permanents just add these rows to your xorg.conf

Section “ServerFlags”
Option “blank time” “0″
Option “standby time” “0″
Option “suspend time” “0″
Option “off time” “0″
Option “dpms” “false”
EndSection

Adding a new disk to a Linux Fedora machine

as root:
fdisk -l to find the new disk.

You'll get something like this:

Disk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000a121f

Device Boot Start End Blocks Id System
/dev/sda1 * 1 25 200781 83 Linux
/dev/sda2 26 1044 8185117+ 8e Linux LVM

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table

So the new disk is /dev/sdb

To create a new partition:
fdisk /dev/sdb
n (new partition)
p (primary partition)
1 (partition 1)
hit enter (first cylinder)
hit enter (last cylinder)
w (write changes and quit)

now check the new status with
fdisk -l

and now you'll get something like this:

Disk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000a121f

Device Boot Start End Blocks Id System
/dev/sda1 * 1 25 200781 83 Linux
/dev/sda2 26 1044 8185117+ 8e Linux LVM

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x6fad050b

Device Boot Start End Blocks Id System
/dev/sdb1 1 1044 8385898+ 83 Linux

Now format the new partition
mkfs.ext3 /dev/sdb1

Create a new folder to mount the new partition:
mkdir /disk2

and edit /etc/fstab to mount it after the next reboot adding this line
/dev/sdb1 /disk2 ext3 defaults 1 2

then reboot

crontab - scheduled tasks in Linux

crontab is a file which contains the schedule of cron entries to be run and at what times they are to be run.
A cron schedule is a simple ASCII text file. Each user has their own cron schedule. You can edit it only with the crontab command. The default text editor is usually vi

usage:
crontab -e add or edit a scheduled task
crontab -l list the the scheduled tasks
crontab -r remove all scheduled tasks

syntax:
you have 6 positions, 5 for the time, 1 for the command to execute

* * * * * command_to_execute
| | | | |
| | | | |_Weekday 0-6 (0 = Sunday)
| | | |___Month 1-12
| | |_____Day 1-31
| |_______Hour 0-23 (0 = midnight)
|_________Minute 0-59

some example:
30 8 * * * rm /home/{username}/temp/*
this entry remove all files in temp directory every day at 8:30 AM

5,35 * * * 1-5 rm /home/{username}/temp/*
this entry remove all files in temp directory from monday to friday every hour at minute 5 and 35

30 8 * * * rm /home/{username}/temp/* >/dev/null 2>&1
this is the same as the first example but with no email notification and no log file

30 8 * * * rm /home/{username}/temp/* > /home/{username}/logfiles/emptytemp.log >/dev/null 2>&1
this is the same as the first example but with no email notification and the log file redirected to a custom location (> to replace the old log file with the new one, >> to append new log file to old one)

a command line tool to download files from rapidshare in Linux

this is a useful simple tool to download files from rapidshare without visual tools. it's perfect if you want download files on your home pc from your office.
you need a valid premium account on rapidshare and wget installed on your pc. to install it: as root yum install wget

create a new directory in your home directory (not as root!):
cd /home/your_user_name
mkdir .cookies
save a cookie in this folder with the following commands:
wget \
--save-cookies ~/.cookies/rapidshare \
--post-data "login=USERNAME&password=PASSWORD" \
-O - \
https://ssl.rapidshare.com/cgi-bin/premiumzone.cgi \
/dev/null

copy and paste the following code and save it as "catchall"

#! /bin/bash
f=`date +%Y-%m-%d_%Hh%Mm%Ss`$RANDOM$RANDOM.log
if [ "$#" = "0" ]
then
echo url missing
else
a="$@"
wget -b -a $f --load-cookies ~/.cookies/rapidshare $a
fi

make it executable and copy it under /usr/bin: as root chmod +x catchall then cp catchall /usr/bin

in your Premium-Zone Settings set as true the option "Direct downloads, requested files are saved without redirection via RapidShare"

now you can download any rapidhare file with the command: catchall your_rapidshare_url_here

you'll get a different log file for each downloaded file. you can see the status of your download with this command: tail -f log_file_name

ctorrent: command line bittorrent client for Fedora

CTorrent is a BitTorrent Client written in C that doesn't require any graphical component, such as an X server.
To install it on Fedora: as root yum install ctorrent

Basic commands: ctorrent -p <port_number> -U <rate_max_upload_Kb> -D <rate_max_download_Kb> <file.torrent>

It's useful to simplify the command with the alias command
If you need to launch it from a remote connection I suggest to use screen command

screen command - multiple ssh session manager

screen is a multiple ssh session manager.

To install it on Fedora: as root yum install screen
To create a new session: screen -S <session_name>
To list all active sessions: screen -ls
To connect to an active session: screen -r <session_name>
To deattach an active session Ctrl+a then d
To exit an active session Ctrl+a then K or simply exit

All command are case sensitive

alias command

List of alias for current user: alias

Add alias: alias ls="ls -al"

Remove alias: unalias ls