# Catatan Seekor: LINUX

## For check open port linux

```bash
netstat -ntulp
```

## For count total connection ESTABLISHED

```bash
netstat -ant | grep ESTABLISHED | grep 5013 | wc -l
```

## Article

* [Centos 7: failed to bring up/down networking: configure interface for a trunk interface](https://unix.stackexchange.com/questions/220750/centos-7-failed-to-bring-up-down-networking-configure-interface-for-a-trunk-in)
* [Enable SSH Server on Debian](https://linuxhint.com/enable-ssh-server-debian/)
* [Fastest way to reset a host key when rebuilding servers on the same IP or hostname frequently](https://www.jeffgeerling.com/blog/2016/fastest-way-reset-host-key-when-rebuilding-servers-on-same-ip-or-hostname-frequently)
* [Fix ‘E: Could not get lock /var/lib/dpkg/lock’ Error in Ubuntu \[Quick Tip\]](https://itsfoss.com/could-not-get-lock-error/)
* [How to Create Users in Linux (useradd Command)](https://linuxize.com/post/how-to-create-users-in-linux-using-the-useradd-command/)
* [How to Delete/Remove Users in Linux (userdel Command)](https://linuxize.com/post/how-to-delete-users-in-linux-using-the-userdel-command/)
* [How to kill a process running on particular port in Linux?](https://stackoverflow.com/questions/11583562/how-to-kill-a-process-running-on-particular-port-in-linux)
* [How to Solve the “Too Many Open Files” Error on Linux](https://www.howtogeek.com/805629/too-many-open-files-linux/)
* [Solved: network.service Failed to start LSB: Bring up/down networking in RHEL/Centos 7/8](https://www.cyberithub.com/failed-to-start-lsb-bring-up-down-networking/)
* [update-java-alternatives vs update-alternatives --config java](https://askubuntu.com/questions/315646/update-java-alternatives-vs-update-alternatives-config-java)
* [How do I change permissions for a folder and all of its subfolders and files in one step in Linux? \[closed\]](https://stackoverflow.com/questions/3740152/how-do-i-change-permissions-for-a-folder-and-all-of-its-subfolders-and-files-in)