https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/pdf/deploying_different_types_of_servers/red_hat_enterprise_linux-8-deploying_different_types_of_servers-en-us.pdf
VirtualBox set back bios time
VBoxManage modify <vm> —biossystemtimeoffset -<milliseconds>
VBoxManage modify <vm> —bios-system-time-offset -<milliseconds>
zimbra vmware suit
Kernel panic not syncing
The kernel panic not syncing error can happen for various reasons, one of which may be due to buffers not being flushed to the actual devices. This error often prevents the system from booting and may affect parts of the kernels and modules.
VMDK choose sata harddisk vs IDE harddisk.
svn get version number
demo svn repo: https://svn.apache.org/repos/asf/subversion/trunk
svn info –show-item=revision –no-newline https://svn.apache.org/repos/asf/subversion/trunk
svn info https://svn.apache.org/repos/asf/subversion/trunk | awk ‘/^Revision:/{print $2}’
Enable SSH for Debian Bitnami
sudo rm -f /etc/ssh/sshd_not_to_be_run
sudo systemctl enable ssh
sudo systemctl start ssh
PaaswordAuthentication
file permission
remove O?
chmod -R o=- path
How to check listening ports in linux
sudo netstat -tunlp
sudo ss -tunlp
sudo lsof -nP-iTCP -sTCP:LISTEN
How to List Installed Packages on Ubuntu
sudo apt list –installed
sudo dpkg-query -l | less
sudo dpkg-query -f ‘${binary:Package}\n’ -W > packages_list.txt
vim
%!xxd
%!xxd -r