Questions tagged [bsd]

The BSD (Berkeley Software Distribution) is a UNIX operating system developed by University of California at Berkeley during the 70s and 80s.

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BASH: Run function every n seconds, but allow it to be interrupted by another keystroke

I'm looking to create a function for a script where another function will be called every few seconds, however the user should be able to issue other commands to the program while this is happening. ...
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Recover usb stick afer writing with dd [duplicate]

Command used: dd if=source.img of=/dev/sdb bs=16k The image (BSD-based OS) was written without errors, but I could not boot from it. When I tried to write a different image, the USB stick was not ...
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vi command line editing insert mode overwrite

I'm using Windows Terminal (TERM=xterm-256color) in a bash shell under Ubuntu: uname -a Linux xxxxxxx 4.19.128-microsoft-standard #1 SMP Tue Jun 23 12:58:10 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux I'...
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OpenBSD flash drive won't boot

I made a OpenBSD boot drive by using this command.sudo dd if=$HOME/Downloads/install68.iso of=/dev/sdb status=progressAfter it's finished making the OpenBSD boot drive, the boot drive refused to boot. ...
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CLI command `lp` ignores page list/range on MacOS (Catalina)

I can not for the life of me get lp to print only a list/range of pages. Every time I use a list/range it just prints all the pages. I'm using MacOS Catalina. Example CLI commands $ lp -o page-ranges=...
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What is the explanation of the network flags in MacOSX? [closed]

Good morning. Could someone explain to me the meaning of the flags in the routing table? For example if you check the output of netstat -nr you will have lines like this: default 192.168.2....
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Besides BSD and Linux, are there any other open-source Unix descendants currently in development? [closed]

This week I'm going to install every major BSD and Linux distro and learn for myself how they differ. Are there any other Unix open-source projects besides these two ancestors that I should consider ...
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I accidentally ran `rm -rf /` what should I do

I accidentally ran rm -rf / on my macos machine, most files were protected since I was not running the command as root, but I definitely lost some files in /usr/local, are there any other files I ...
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Installing a second OS carries a risk of data loss; even your PC's user manual says so. If you have backups, is it now okay to install a second OS?

Background A variety of Samsung laptops say something like this in their user manuals (PDF): If you change the product's factory OS (Operating System) to another OS, or if you install software which ...
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INACCESSIBLE BOOT DEVICE BSOD on Windows 10

I am getting the error INACCESSIBLE BOOT DEVICE, I have tried everything.the computer is in an infinite loop of restarting. Safe mode doesn't start, the reset this PC doesn't work, the uninstall ...
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how can I get the yes command to force overwrite and to do so with new lines?

I would like cp to prompt before overwriting so I am using -i. (I might sometimes use an alias for cp, or similar, so cp always occurs with -i). I may want to say overwrite all. I know that's the ...
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135 views

Delete emails from specific source in mailx/BSD mail

I need to delete all emails from a specific source. I can list all of the emails with the f source@emailaddress.com but I'm having to dump it to something like awk and back into mail... or copy all of ...
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How could a hacker access the /etc/shadow file if it is only accessible by root and they do not have root access?

I am reading a book on ethical hacking, and it has some examples in Python which I won't post here unless asked since this isn't Stack Overflow. But, I was wondering, if a hacker was trying to access ...
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1answer
93 views

Can I share my home among multiple operating systems?

Is it possible to have on the same hard disk a single home partition (e.g. EXT4), shared by multiple operating systems? What I would like to do is to install Linux, HURD and DragonFlyBSD on the same ...
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conversion from GNU sed to BSD sed

I am new to sed and am trying to implement this answer on a mac. After some quick research I believe I have to convert the code to BSD sed. I haven't had much success looking into the BSD sed ...
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How to chain awk print statements?

Okay, here's a quick example; me isolating a host's IPV4 in three steps: ip -br a lo UNKNOWN 127.0.0.1/8 ::1/128 eth0 DOWN wlan0 UP ...
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1answer
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pkg install using specific version of Python in FreeBSD?

How do you 'pkg install' a package using specific version of Python in FreeBSD 11? say I want to 'pkg install' using Python 3?
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Why does blocksize arguments change for shell utilities on Linux vs OSX?

When following a tutorial for flashing a ROM that uses the dd utility, I received an console warning that '1M' was not a supported blocksize. OSX requires a blocksize of '1m'. What is the root ...
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What version of tar does 7-zip use?

Does anyone know what version of tar 7zip uses for archiving/extracting? Is it gnu tar or bsd tar... or something else? I've googled around for an answer but can't find anything.
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Is there a native alternative to the `watch` command; for Darwin/OS X

I have a script that I'm trying to port from Linux to Darwin/OS X. The Linux version currently depends on the watch command, which doesn't appear to be installed on Darwin/OS X by default. What's the ...
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bsd (osx) pf nat - change source port on outgoing UDP packets

I am running docker-machine on osx. docker-machine is running NAT so when my container send out a UDP packet on port 1812, NAT is translating it to some random port. I am playing around with pf nat (...
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454 views

Using specific grep flags from BSD general commands version on a Mac

So I have been using a command piped through curl (on GNU/Linux's grep utility) to generate a random password string for tightening security on some of my accounts. curl -s https://www.grc.com/...
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Why is Bash reporting “command not found” in some cases in the Terminal but not in others?

Often, but not always, when I start the Terminal on my computer and use pipe (|) in a command, pbpaste | wc as an example, bash gives -bash:  wc: command not found. (The double space is not a typo). ...
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921 views

Alternate location for GPT partition entry table

The GPT header (usually in LBA 1) has a PartitionEntryLBA field (see 5.3.2 GPT Header in the spec). There is language in various references (such as the wikipedia GPT entry) describing that field ...
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Netstat VS Netstat (Gnu/Linux VS BSD/Mac OS X)

Why are there different versions of netstat for Gnu/Linux and BSD/Mac OS X? I'm trying to get the latter to respond & behave more like the former.
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Recursively compress files in a directory and subdirectories using command line “zip” tool in Mac OS X and exclude .DS_Store files from ALL subfolders

I'm trying to create a ZIP file using the command line zip tool that comes with the Mac OS X Terminal. I want to recursively compress the contents of the current folder but excluding .DS_Store files. ...
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Compare list of files from a database using find to locate missing files

I have a list of 2000 files from a database that looks like this: ./aa/0f/unique-string/IMG_0987.JPG ./ab/cf/unique-string/IMG_0987.JPG I want to compare that list to the actual directory contents ...
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3answers
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On OS X, why does `sudo ls` show hidden (dot) files?

With OS X Yosemite, using the following commands, I get the following: $ touch .a $ touch b $ /bin/ls b $ /bin/ls -A .a b $ sudo /bin/ls .a b It shows hidden files (that have names starting with a ...
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1answer
5k views

Why can't I use my newly created user with chown?

So I am attempting to create a new user and group, and then change ownership of a directory to that new user/group. However, when I do, chown comes back with an "illegal user name" message. Here's a ...
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239 views

How can I make this SED command more portable?

I'm using the following sed command: cat version | sed -e 's/[0-9][0-9][0-9][0-9][0-9:M]*-[abp]/Ver\n/' Which normalizes like this: 4330M-p -> Ver<newline> This works fine with GNU SED, ...
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584 views

Forcing *BSD to accept both IPv4 and IPv6 traffic on a single socket

I have tried a ton of stuff and keep coming up entirely empty handed. Allow me to frame the situation: I have a *BSD Jail setup in FreeNAS that runs a Plex Media Server (Plexpass). It has IPv6 ...
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40 views

BSD Packet Filter Redirect Internal traffic

I'm using OSX Yosemite with Packet Filter (BSD). Is there a way to redirect internal originating traffic (let's say from en1) to lo0 on a specific port for specific destinations? rdr from what I ...
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1answer
1k views

PF rule using return-rst on Mac OS X does not reply with TCP reset

I'm trying to add a simple PF rule: block return-rst out proto tcp from any to any port 33128 to filter all outgoing traffic to TCP port 33128, and I'd like it to respond with a reset. However, when ...
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Interactive search of tmux sessions

When switching between tmux sessions with the interactive session menu (<prefix>-s), you can jump to a specific session by typing the session's numeric or alphabetical index, e.g. (0) + ...
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2answers
110 views

How does an OS run before drivers are installed?

I am looking into hardware compatibility of BSD vs Linux vs Windows. One comment that keeps reoccurring is "check your hardware before installing any variant of BSD". This is also a (smaller) issue ...
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1answer
441 views

PC shutdown unexpectedly without blue screen

My PC is shutting down after few hours(?) without BSD, but keyboard lights, power LED, fans are running (it's not sleep mood or hibernating). To switch them off I have to switch off the UPS, holding ...
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Port forwarding outgoing request with PF

I'm trying to redirect all outgoing traffic from my local machine on port 843, to go to my local service on port 1234. So, when I make a request to e.g. 1.2.3.4:843, I want it to connect to 127.0.0.1:...
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What is a better approach for ZFS?

I am making zpools on FreeBSD machine. While creating zpools I observe these two cases:- If I take raw disks and create zpool then I am able to form zpools and they are working perfectly. If I format ...
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256 views

Can user-mode Linux be compiled and run on UNIX systems?

e.g. on NetBSD or Solaris? Or does it require exclusively Linux-specific system calls, virtual filesystems, etc.? Also, if it's currently limited to Linux, what changes would be required to port it ...
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223 views

Is there any Linux Distro based on BSD

I have hp probook 4530s. I have tried variety of OS on this but after using 10-15mins its screen flicks and the system hangs. Check the attached screenshot This screen flicks for all windows OSs, ...
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trying to install FreeBSD from a pen drive. Failed with error 19

I am trying to install FreeBSD from a pen drive. But it returns an error on boot. cd9660 :/dev/iso9660 error :/dev/iso9660/FREEBSD_INSTALL failed with error 19 and appears mountroot> command ? ...
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1answer
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What's are the technical differences between “chmod -w file” and “chflags uchg file”

BSD/MacOS question. chmod -w file will remove all the write permissions from file chflags uchg file will set the user-immutable bit (aka "Locked" bit) on file Beyond the obvious statement of "...
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2answers
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How do you determine if you're on a Linux or BSD system inside a script?

I've got a rather extensive selection of dotfiles thats been kept in a git repo for the longest time - I just maintain a separate branch of code for bsd-isms (for instance, on Linux, to get colored ls ...
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Why do we use cp to copy files and not dd? (in unix-derivatives)

For normal file copying in *nix, I've only ever seen people use cp (eg. cp /mnt/mydevice/myfile ~/myfile), but I eventually ran into dd, which appears to do the exact same thing (dd if=/mnt/mydevice/...
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1answer
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FreeBSD compatibility layer on Linux

I am aware of Linux mode on FreeBSD, where Linux binaries can seamlessly be executed in FreeBSD. From the FreeBSD handbook: In effect, there is a Linux kernel in the FreeBSD kernel. The various ...
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1answer
2k views

Backup bootable USB flash in Mac OS X

I have a bootable USB. It runs Linux. The size of USB pen is 8Gb, and linux partitions take less than 200Mb. $ diskutil list /dev/disk0 #: TYPE NAME SIZE ...
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What is the BSD equivalent of Linux `netstat -lptun`?

In Linux, netstat -lptun gives a list of servers with the following details: protocol local and foreign address state PID and program name What is the command's equivalent in FreeBSD? Thanks.
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2k views

Sudo su vs su linux

If I enter in the password to su when prompted, it doesnt work while sudo su does. Also, when a command is executed using sudo (command), does sudo automatically execute it by root by default (since ...
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1answer
213 views

Install linux/bsd on compact flash using USB connector

How do I install linux/bsd on compact flash with usb compact flash adapter. The compact flash will boot on single board x86 computer as an IDE drive, but I'm doing the install on a regular computer ...
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215 views

“bad magic number” during fresh OpenBSD installation to a USB stick

Trying to install OpenBSD 5.2 onto disk sd0 (2GB USB storage connected to the computer). Burned install52.iso as image to a CD, loaded it into CD drive, and booted off it. After selecting [W]hole ...