![]() It means that this is a server that everyone can send emails through it without the need to identify first or be a part of the domain group.ħ: How to create a symbolic link between /bin/runme to the new file /bin/runmetoo?Ĩ: You want to find and delete all of the “.tmp” files in /home/* then how can you do it in a command?įirst you need to find these files using find command, then delete them using rm command –įind /home/ -name ‘*.tmp’ | xargs rm –rf.ĩ: How can you add an “auto correction” that will automatically fix “cd /homr” to “cd /home”? ping6, traceroute6, tracepath6.Ħ: What does an open mail relay server mean? The commands ending with 6 are intended to use on ipv6 addresses i.e. The commands ping, traceroute, tracepath are used on ipv4 addresses. ![]() Use keyboard combination of Alt-Ctrl-Backspace which will force restarting X serverĤ: Which TCP ports are used for FTP, SSH, SMTP, POP3, HTTP and HTTPS respectively?įor the mentioned services following TCP ports 21, 22, 25, 110, 80, 443 are used respectively.ĥ: What is the difference between ping and ping6? ģ: You encounter issues while using X and you cannot quit the X server, how can you force it to restart? It can be set by “export EDITOR=nano” The system will use the editor defined in your EDITOR environment variable. Ģ: How do you change the default editor to nano when used by a system command (like crontab -e)? SSH and Telnet are both communication protocols to manage a remote system, Unlike Telnet which sends the data on clear-text, SSH is the secured version of the telnet, and will require key exchange. ![]()
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