Black Screen Installing CentOS 7 on VirtualBox

I noticed something that was irritating me this morning.  The screen would go black after I chose to install CentOS 7 on VirtualBox.  What you can do is choose Troubleshooting in the startup of the installer. Then choose Basic graphical install, this seems to get around the problem.

Hope this helps somebody!

Linux Disk UUID The easy way…

This is an awesome tip. Just to note you have to say “disk” in the path /dev/disk because without it, the command will not work. Example ls -l /dev/sda1/by-uuid is incorrect.

/home/liquidat

shell.png
There is an update to this post available: UUIDs and Linux: Everything you ever need to know.

The Universally Unique Identifier can be used to identify a device independent form its mount point or device name. This is more and more important as many devices today support hot-plugging or are external anyway. Therefore it makes sometimes sense to access a device (for example in fstab) not by device name but by the UUID.

There are several ways to get the UUID. The first one uses the /dev/ directory. While you are on is you might want to check other by-* directories, I never knew of them.

Another way to get the uuid by usage of the tool blkid:

There you also get the label and other information. Quite usefule.

Btw., if you wonder how “unique” this unique is, here a quote from Wikipedia:

1 trillion UUIDs would…

View original post 28 more words

Powershell – Top Command

For those of you who love the top command in Linux…

 

function Get-Top{

#######################################

##Get-Top

##

##Written By: John Glasgow

#######################################

<#

.SYNTAX

Get-Top [-delay interval] [-pid pid_number]

 

.SYNOPSIS

Emulates the top command from Linux/Unix.

 

.EXAMPLE

To set delay of 5 seconds.

Get-Top -delay 5

 

.EXAMPLE

To watch a particular process.

Get-Top -pid 4408

#>

$delay = 2

$proc = -1

 

for($i = 0; $i -lt $args.Count; $i += 1){

if( $args[$i] -ilike “-d*” ){

$i++

$delay = $args[$i]

}

if( $args[$i] -ilike “-p*” ){

$i++

$proc = $args[$i]

}

if( $args[$i] -ilike “-q*” ){

$i++

$delay = 0

}

}

 

while ($true){

Clear-Host

if($proc -gt 0){Get-Process | Sort-Object -Descending cpu | Where-Object{ $_.Id -eq $proc } | Format-Table}

else{Get-Process | Sort-Object -Descending cpu | Select-Object -First 20 | Format-Table}

Start-Sleep -Seconds $delay

}

}

Set-Alias top Get-Top