When running man command on a debian server, i get error root@lab:~# man sftp -bash: man: command not found root@lab:~# This is because man-db package not installed on the server. To fix, install man-db package with apt install man-db See Errors
When working with git, to avoid accidental commit to wrong branch, it will be better if terminal show the branch name you are currently in. To display “git branch” in terminal, edit .bashrc vi ~/.bashrc Add following code to end of the file. # Show git branch in command promt if git repo show_git_branch() { … Read more
Reverse-DNS/PTR is used by mail servers. It is used to map an IP address to FQDN or hostname. To find Reverse DNS record for an IP address, run nslookup IP_ADDR_HERE In this example IP 51.38.246.115 have a Reverse DNS record ok.serverok.in Using dig You can also use dig command to find PTR record for an … Read more
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 Reboot the server with reboot You can disable selinux for current session by running command setenforce 0 See SELinux
For linux to show hidden files when you type ls command Edit ~/.bashrc vi /root/.bashrc Add line alias ls=’ls -la –color’ Save and exit. Now you need to re login to SSH to see the hidden files when you type “ls” After editing the file will look like [root@194 ~]# cat /root/.bashrc # .bashrc # … Read more
Here is some example of using curl to login to site, use cookie to do further requests. curl -k –cookie-jar ./cookies_hotfile –data “returnto=%2F&user=USERNAME_HERE&pass=PASSWORD_HERE” http://site.com/login.php curl -L -O –cookie ./cookies_hotfile http://site.com/dl/5222/4444/file.zip.html See curl
chown command is ued to change ownership of a file or folder In this example ownership of folder public_html to username and group specified. chown -R username:group public_html -R used for recursively change ownership, that is all files and folders inside the folder also get the new ownership. See Linux Commands
yum install at Enable atd [root@server12 ~]# service atd status atd is stopped [root@server12 ~]# chkconfig –list | grep atd atd 0:off 1:off 2:off 3:on 4:on 5:on 6:off [root@server12 ~]# service atd start Starting atd: [ OK ] [root@server12 ~]# Setting Job [root@server12 ~]# echo “/sbin/shutdown -h now” | at 21:15 16.02.2017 job 1 at … Read more
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 commands like STAT LIST RETR DELE RSET TOP QUIT See telnet
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 settings. See apt
rpmquery command allow you to check if a specific rpm package installed on your computer. rpmquery PKG_NAME Example See rpm
PowerDNS is an OpenSource DNS server. Update apt repo apt-get update && apt-get upgrade -y On Ubuntu, systemd-resolved listen to port 53. This is a local DNS resolver, we need to stop this service before we can install PowerDNS. systemctl disable systemd-resolved systemctl stop systemd-resolved rm -f /etc/resolv.conf echo “nameserver 1.1.1.1” > /etc/resolv.conf echo “nameserver … Read more