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On an Acer PC, after installing any Linux system with any bootloader, I can boot it once, but after a reboot the UEFI Linux entry is gone. The Linux system’s file in the EFI boot partition seems to still be here. I tried this with Ubuntu and ArchLinux, with GRUB and systemd-boot. Why does this…
I have downloaded and installed the newest virtualbox 4.3.20 for my Windows 7 (64-bit OS), but when I want to install 64-bit Linux, the New->Create Virtual Machine only displays 32-bit option, no 64-bit option. Could anyone give any clues about this issue? Thanks very much in advance! Solution: Take a look: http://www.fixedbyvonnie.com/2014/11/virtualbox-showing-32-bit-guest-versions-64-bit-host-os/ If VirtualBox is…
It annoys me having used Unix in college and now working on the Windows side. What’s the history behind this decision? Anyone know why it worked out this way? Solution: Unix introduced / as the directory separator sometime around 1970. I don’t know why exactly this character was chosen; the ancestor system Multics used >,…
I am having a problem with Hibernating my Windows 7 PC. When ever I try to hibernate, the screen goes blank for a while, there’s disk activity and then I am presented with the Login Screen. I’ve tried enabling/disabling hibernation, not helped.When I run shutdown /h I get a error: “The system cannot find the…
For one reason or another, my Word suddenly decided to stay always on top of all other windows. This is terribly annoying. The odd thing is: of three documents I have open, two are on top of everything else, and one behaves normal. I found one other mention of this behavior. I wonder whether this…
I am using the .NET Framework classes to get the IP addresses for my machine. Dns.GetHostAddresses(Dns.GetHostName()) I have a VirtualBox adapter which has both an IPv4 and IPv6 address. Using the .NET code I am getting the IPv6 address as fe80::71a3:2b00:ddd3:753f%16 Notice the %16 at the end? However, if I query the same using…
When I pinged my mailserver from the command prompt using: telnet mail.mydomain.com 25 I got the error Telnet is not a recognized command. I looked for a workaround and then found that Telnet was unchecked by default in Windows. Once i checked it, it started working. Solution: TELNET communicates with the peer (telnet server) in…
I am using Red Hat Linux Enterprise version 5. I’ve noticed people sometimes running commands with a couple of & options. For example, in the below command, there are two & signs. What is the purpose of them? Are they always used together with nohup? nohup foo.sh <script parameters> >& <log_file_name> & Solution: In addition…
What is different about the way Windows runs an executable and Linux runs an executable? Why did they have to be different? Besides, why don’t Linux executables have a file extension? I’m not asking about how to make a EXE file work on Linux. I’m asking why it does not work. Solution: Linux and Windows…
Why does Nmap report “Host seems down” when a simple ping succeeds? me@computer:~$ ping 123.45.67.89PING 123.45.67.89 (123.45.67.89) 56(84) bytes of data.64 bytes from 123.45.67.89: icmp_req=1 ttl=45 time=91.1 ms64 bytes from 123.45.67.89: icmp_req=2 ttl=45 time=102 ms64 bytes from 123.45.67.89: icmp_req=3 ttl=45 time=100 ms^C— 123.45.67.894 ping statistics —3 packets transmitted, 3 received, 0% packet loss, time 2002msrtt…
