bash: man: command not found
When running man command on a debian server, i get error root@lab:~# man sftp -bash: man: command not found root@lab:~# This is…
linux
Show git branch in terminal
When working with git, to avoid accidental commit to wrong branch, it will be better if terminal show the branch name you…
Find Reverse-DNS/PTR using dig, nslookup, host
Reverse-DNS/PTR is used by mail servers. It is used to map an IP address to FQDN or hostname. To find Reverse DNS…
Disable SELinux on CentOS/RHEL
To disable SELinux Method 1 sed -i ‘s/SELINUX=enforcing/SELINUX=disabled/’ /etc/selinux/config setenforce 0 Method 2 edit file vi /etc/selinux/config Find SELINUX=enforcing Replace with SELINUX=disabled…
Show Hidden Files
For linux to show hidden files when you type ls command Edit ~/.bashrc vi /root/.bashrc Add line alias ls=’ls -la –color’ Save…
curl using cookie
Here is some example of using curl to login to site, use cookie to do further requests. curl -k –cookie-jar ./cookies_hotfile –data…
chown
chown command is ued to change ownership of a file or folder In this example ownership of folder public_html to username and…
at
yum install at Enable atd [root@server12 ~]# service atd status atd is stopped [root@server12 ~]# chkconfig –list | grep atd atd 0:off…
Testing POP3 mail box with telnet
To test if pop3 mailbox work using telnet, use telnet MAIL_SERVER_IP 110 user YOUR_EMAIL_ADDRESS pass YOUR_EMAIL_PASSWORD Once logged in, you can use…
Auto upgrade software in Ubuntu/Debian
To auto upgrade software packages in Ubuntu/Debian, install apt install -y unattended-upgrades Edit vi /etc/apt/apt.conf.d/50unattended-upgrades In this file, you can configure various…
rpmquery
rpmquery command allow you to check if a specific rpm package installed on your computer. rpmquery PKG_NAME Example See rpm
Install PowerDNS on Ubuntu 20.04
PowerDNS is an OpenSource DNS server. Update apt repo apt-get update && apt-get upgrade -y On Ubuntu, systemd-resolved listen to port 53.…