find . -name “*.jp” | while read i; do mv “$i” “${i%.jp}.jpg”; done
Category: linux
Ubuntu 19.10 Lenovo amd a9 s145-15ast
Screen flicker:
sudoedit /etc/default/grub
Find the line beginning GRUB_CMDLINE_LINUX_DEFAULT
and add the text amdgpu.dc=0
between the double quotes (""
). Leave any other parameters as they are. For example, you may end up with a line like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amdgpu.dc=0"
Save the file and exit, and then run
sudo update-grub
to write the configuration, and reboot.
ubuntu 19 speed up local samba access
sudo nano /etc/nsswitch.conf
hosts: files wins dns mdns4_minimal [NOTFOUND=return]
sudo nano /etc/avahi/avahi-daemon.conf
use-ipv6=no
disable ipv6 in wifi/eth0 interfaces
sudo ufw disable
sudo sysctl vm.swappiness=10
sudo su
echo "#disable ipv6" >> /etc/sysctl.conf
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.lo.disable_ipv6 = 1" >> /etc/sysctl.conf
sudo nano /etc/samba/smb.conf
add
netbios name = linuxlap1
name resolve order = lmhosts wins bcast host
Ubuntu 19 Intel graphics laptop slow video playback/stuttering fix
Do
sudo mkdir -p /etc/X11/xorg.conf.d/
sudo vim /etc/X11/xorg.conf.d/20-intel.conf
Then paste this to the file
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "TearFree" "true"
EndSection
Reboot
virtualbox linux guest permission denied on shared folder
Problem:
/media/sf_sharedFolder/: Permission denied
Solution 1
Edit the file /etc/group
. Look for the line vboxsf:x:999
and add at the end :yourusername
Solution 2
Run sudo adduser yourusername vboxsf
Reboot
backup /etc with tar
The following is an exemplary command of how to archive your system.
tar -cvpzf backup.tar.gz --exclude=/backup.tar.gz --one-file-system /etc
back.sh (backup with timestamp) – add to cron (sh /back.sh)
#!/bin/bash DATE=$(date +%Y-%m-%d-%H%M%S) BACKUP_DIR="/backup" SOURCE="/etc" tar -cvzpf $BACKUP_DIR/backup-$DATE.tar.gz $SOURCE
headless ubuntu fsck waits for Y key during bootup
I have a headless Ubuntu 12.04 server in a datacenter 1500 miles away. Twice now on reboot the system decided it had to fsck. Unfortunately Ubuntu ran fsck in interactive mode, so I had to ask someone at my datacenter to go over, plug in a console, and press the Y key. How do I set it up so that fsck runs in non-interactive mode at boot time with the -y
or -p
(aka -a
) flag?
For Ubuntu 15,16,17+ the FSCKFIX value setting is located in /lib/init/vars.sh
sudo nano /lib/init/vars.sh
change FSCKFIX=no to FSCKFIX=yes
List all IPs in Subnet with Nmap
nmap -sP 192.168.8.0/24