You can have dd show the progress of a write by specifying “status=progress” in the command line arguments.
sudo dd if=Downloads/CentOS-8-x86_64-1905-boot.iso of=/dev/sdb status=progress
Example:
bob@localhost:~$ sudo dd if=Downloads/CentOS-8-x86_64-1905-boot.iso of=/dev/sdb status=progress 559690240 bytes (560 MB, 534 MiB) copied, 96 s, 5.8 MB/s <-- This is shown while writing. 1093632+0 records in 1093632+0 records out 559939584 bytes (560 MB, 534 MiB) copied, 96.0339 s, 5.8 MB/s
There are a few different ways to find out the system up time in Linux.
admin@localhost [~]# cat /proc/uptime 306350.37 2218975.63 admin@localhost [~]#
Taking the above command one step further, we can run it in the date command to see the system start up date.
date --date="cat /proc/uptime | awk '{print $1}'seconds ago"
[admin@localhost ~]$ uptime 6:25AM up 2 days, 6:24, 3 users, load averages: 0.00, 0.00, 0.00 [admin@localhost ~]$
[admin@localhost ~]$ w 6:27AM up 2 days, 6:25, 2 users, load averages: 0.00, 0.00, 0.00 USER TTY FROM LOGIN@ IDLE WHAT admin p1 localhost. 6:09AM 13 su (bash) admin p2 localhost. 6:25AM - w [admin@localhost ~]$
Reference links
https://sharadchhetri.com/2013/03/18/4-different-commands-to-find-system-uptime-in-linux/
Find active screens with
xrandr | grep " connected"Example output
HDMI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
eDP-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 294mm x 165mmSet desired screen brightness. Range is from 0-1
xrandr --output eDP-1-1 --brightness .5You can print a random number between 1-10 with the following command.
echo $((( RANDOM % 10 )+1))
If you change it so the output is between 0-9 you get decently even results.
cat /dev/null > random.txt && cat /dev/null > random2.txt && for ((i=0; i<=9999;i++)); do echo $((( RANDOM % 10 ))) >> random.txt ; done && for ((i=0; i<=9;i++)); do echo $(grep -c $i random.txt) $i; done | sort -n
Note that you can change the command to be between 1-10, but all the 1’s in 10 will get grepped and counted as 1’s.
The above command should return something similar to the following. Sorted by lowest occurrences first.
943 5 945 8 985 7 996 2 997 6 1005 3 1012 9 1016 4 1033 0 1068 1 admin@localhost:~$
We can plot them in LibreOffice Calc.
Gnuplot is another utility that you can use to plot numbers. Example is below.
cat /dev/null > random.txt && cat /dev/null > random2.txt && for ((i=0; i<=9999;i++)); do echo $((( RANDOM % 10 ))) >> random.txt ; done && for ((i=0; i<=9;i++)); do echo $i $(grep -c $i random.txt) ; done | sort -n | gnuplot -p -e 'plot "/dev/stdin"'
Find the thumb drive with lsblk, dmesg, or sudo fdisk -l. In the following examples we are using /dev/sdc1, replace as needed.
sudo cryptsetup --verbose --verify-passphrase luksFormat /dev/sdc1 sudo cryptsetup luksOpen /dev/sdc1 encrypted_usb sudo mkfs.ext4 /dev/mapper/encrypted_usb
Now we can mount the drive. We are mounting it to /mnt change if needed.
sudo mount /dev/mapper/encrypted_usb /mnt
Or go ahead and close the channel and remove the drive
sudo cryptsetup luksClose /dev/mapper/encrypted_usb
sudo cryptsetup --verbose --verify-passphrase luksFormat /dev/sdc1
Wipe /dev/sdc1 and set the password when prompted for it.
sudo cryptsetup luksOpen /dev/sdc1 encrypted_usb
Open up a secure channel to the drive, and decrypt it so we can access it
sudo mkfs.ext4 /dev/mapper/encrypted_usb
Using the channel we created in the previous command, we can now format the drive.
sudo cryptsetup luksClose /dev/mapper/encrypted_usb
We can now close the channel for the drive and remove it.
Command from here
https://android.stackexchange.com/a/78183/239063
From a command line run
( printf "\x1f\x8b\x08\x00\x00\x00\x00\x00" ; tail -c +25 ~/Path/to/android_backup.ab ) | tar xfvz -
#!/bin/bash
array=(one two three)
echo "Printing first object in array." #Replace 0 with the place number of the array item
echo ${array[0]}
echo ""
echo "Whole array"
echo ${array[*]}
echo ""
echo "Array indexes"
echo ${!array[*]}
Output
Printing first object in array. one Whole array one two three Array indexes 0 1 2
It appears that the issue could be a corrupt VirtualBox.xml file. The one I had did not have anything in it. Removing or moving the file let it create a new one and let VirtualBox actually start.
mv ~/.config/VirtualBox/VirtualBox.xml{,old}
Only problem is that none of the VM’s showed up. Was able to go to the ~/VirtualBox folder in a file browser and launch the vbox file to start the VM
Where are the trash files stored?
The file location for the trash is in the following directory
~/.local/share/Trash/
Inside there are two folders. info and files.
info – Keeps track of what was deleted and where it was
files – Contains the actual files
Delete the files in the Trash
To delete the files, select the files then press “Shift + Del”
or right click, hold Shift down and select Delete.
First you can search for “About System” in the KDE or Gnome search boxes to find the information.
From a terminal you can use the following command
uname -r
Example output
4.15.0-65-generic