I’m trying to get a job in IT that will (hopefully) pay more than a usual 9 to 5. I’m been daily driving Linux exclusively for about 2 1/2 years now and I’m trying to improve my skills to the point that I could be considered a so-called “power user.” My question is this: will this increase my hiring chances significantly or marginally?
Yes. Yes it does.
Look for job listings that require command line Linux skill.
The candidate pool who can get around on a Linux command prompt is growing, but it’s still pretty small. It gives you some advantage toward networking, Cybersecurity, systems administration, and cloud deployment.
I’ve hired for junior positions on a sysadmin team and Linux as a hobby is the number 1 thing I look for. It moves your resume to the top of the stack.
What education do you have in the area?
The IT/Sysadmin sector does have a risk with knowing enough to be dangerous.
Daily driving Linux is great to get used to the command line, but is different from running servers.
If you have no experience with running Linux servers, I would be focusing on that part, rather than daily driving at this point.
Running a server requires a bit of a different mindset to that of just using a desktop.
You need to be far more restrictive about installing software on the server, be more cautios of reboots, and in general focus on stabillity.
You also need to familiarize yourself with Debian/Ubuntu and Red Hat/Fedora based distributions, their package managers, apt and dnf, the general layout of the system, they are mostly similar, but they have their own flavours, especially when it commes to the config files.
Learn the basics of vim, it will allways be installed on a server, I prefer nano but can use vim if needed.
A big part of my job when I was a Helpdesk technician combined with a Linux sysadmin was storage, I had to set up VMs in vSphere and Nutanix and give them the correct ammount of storage, sometimes also expand the storage on a server, and work with mountpoints.
Play around with LVMs, learn the concepts of PVs, VGs and LVs, learn how to expand them, how to move an LV from one PV to another inside a VG, learn how to mount them.
Learn how to set a manual IP, this can change from version to version of a distribution.
Learn to get annoyed at YAML files.
Understand how to secure a system, I’ll admit that I never really had to do this as all servers I worked on was behind strong firewalls and not accessable from the internet, but I did my best with what I had.
Prefers Nano over Vim? Why’d you have to go and commit a felony. Now I can’t take anything you say seriously. Damnit.
And no sense of humor over what was clearly a joke comment. Icing on the cake.
Now I believe you now, you do use Nano.
This is a great response, would heed its points especially the yaml files.
Just make a template, once done you can easily do it while blasting Scooter, get pissed when it breaks due to a change of interface names, switch to Sabaton while you battle it out. After that you go to the local zoo and watch some Lynx just relaxing all day and ask yourself where it all webt wrong.
I interview developers and information security people all the time. I always ask lots of questions about Linux. As far as I’m concerned:
- If you’re claiming to be an infosec professional and don’t know Linux you’re a fraud.
- If you’re a developer and you don’t know how to deploy to Linux servers you’re useless.
So yeah: Get good with Linux. Especially permissions! Holy shit the amount of people I interview that don’t know basic Linux permissions (or even about file permissions in general) is unreal.
Like, dude: Have you just been chmod 777 everything all this time? WTF! Immediate red flag this guy cannot be trusted with anything.
Quick and dirty: the basic permissions are read, write, and execute, and are applied to the owner, the group, and everyone else. They’re applied to all files and directories individually.
It’s represented by a 3 digit number (in octal, which is base 8, so 0 to 7). The first number is the permission given to the file’s owner, the second to the file’s group owner, and the third to everyone else. So, the owner of the file is the one user account that owns it, the group applies to all members of that group. User and group ownership are also applied to each file and directory individually.
Read, write, and execute are represented by the numbers 4, 2, and 1, respectively, and you add them together to get the permission, so 0 would be nothing, 1 would be execute but not read or write, 2 would be write but not read or execute (and yes there are uses for that), 3 would be write and execute but not read, 4 is read only, etc through to 7 which is basically full control.
This will take a little bit to make sense for most people.
chmod (change modifier, I think) is the program you use to set permissions, which you can do explicitly by the number (there are other modes but learn the numbers first), so chmod 777 basically means everyone has full control of the file or directory. Which is bad to do with everything for what I hope are obvious reasons.
chown (change owner) is the program you use to set the owner (and optionally the group) of a file or directory, and chgrp (change group) changes the group only.
It gets deeper with things like setuid bits and sticky bits, and when you get to SELinux it really gets granular and complex, but if you understand the octal 3 digit permissions, you’ll have the basics that will be enough for quite a lot of use cases.
(Additionally to the 3 digit number, permissions can be represented a bit friendlier where it just lists letters and dashes, so 750 (full control user, read and execute group) could be shown as rwxr-x—, where r=read, w=write, and x=execute, and what they’re applied to can be represented by the letters u for user (aka owner), g for group, and o for other)
This goes into more detail of those basics: https://opensource.com/article/19/6/understanding-linux-permissions
Read, write, and execute are represented by the numbers 4, 2, and 1, respectively, and you add them together to get the permission
Maybe I’m the weird one here but this seems like a counter intuitive way to remeber/explain it. Each octal digit in the three digit number is actually just 3 binary digits ( 3 bit flags) in order of rwx. For example read and execute would be 101 -> 5.
Can I ask if the reverse applies, eg is having no idea how to use non Unix like OSes (like Windows) any kind of red flag? Kinda been considering trying to go into a tech career so that I can have a 9-5 office job (I’ve until recently worked in what would be considered “blue collar” jobs, recently switched to an education job, would be nice to just sit down in an office and use computers for a living). I’ve used (GNU/)Linux from a very young age (parents had an Ubuntu laptop), as my primary OS/daily driver since I was 13, and exclusively (i.e. got rid of my Windows partition due to Windows enshittification) since I was idk maybe 16 ish? So I’m pretty comfortable doing things in Linux. But I have a reputation for being a tech person among my friends and they ask me to fix their stuff sometimes and whenever it’s a Windows problem I literally have no idea how to use the OS lol. So are Windows skills and knowledge also expected for tech jobs or just Linux/Unix-like?
There’s not much to learn in Windows land! Learn how to set file permissions, how the registry works (and some important settings that use it), and how Active Directory works (it’s LDAP) and you’ll be fine.
If you’re used to using Linux nothing will frustrate you more than being forced to use a Windows desktop. The stuff you use every day just isn’t there. You can add on lots of 3rd party tools to make it better but it’ll never measure up.
When you have to go out on the Internet to download endless amounts of 3rd party tools the security alarms in your head might start going off. Windows users have just learned over time to ignore them 🤣
If you’re used to using Linux nothing will frustrate you more than being forced to use a Windows desktop. The stuff you use every day just isn’t there.
Absolutely. I tried using Windows for gaming some years back when Wine wasn’t as good and it was such a struggle. I was used to thinking there’s more software for Windows since it’s more widely used, but I was shocked at both how much software I used was Linux (or POSIX-compliant) only, some of which had no Windows alternative. I remember struggling so much to just try and get some files off a LUKS-encrypted drive on Windows and was shocked that there was basically no option at the time. I also hate how Windows users just download random exes off the web for all their programs. I only ever used chocolatey to install anything for that brief Windows stint.
Sorry for your loss. I hit myself with the ‘rm -rf /*‘ several years back when I was actually trying to do ‘rm -rf ./*‘.
Now I do ‘ls’ instead of ‘rm’ just to make sure that what I’m deleting is what I’m intending to.
Figured I was very lucky that it was just on my own workstation and not on any of the servers I was tasked with maintaining. I lost a day or so of work. Had it been our dev server? Would’ve destroyed my team for a while.
Depends. It/tech is a massive space so not certain if you’re applying to tech support or like server architecture. So some specifics would be nice.
One thing to point out:
I thought I was a freaking wiz kid at Windows because I knew about the registry and how to modify settings. But then I learned a lot of the “hacks” on the internet are bad for the enterprise.
On Linux, it’s even worse, with so many blog posts recommending sudo this, and install this app that. And if you don’t have a background of WHY, you can do a lot of damage. And with AI, it’s even worse. So many bash script kiddies asking AI to write the ugliest code I ever seen.
Now that Im a senior engineer, I realize I know nothing and leave much of the IT space to trained professionals.
This is very good insight and something that no one else touched on. OP if you see this, while being a power user on your personal linux machine does help with skills and getting you jobs, it’s still very different from administering an enterprise linux machine in a corporate environment. One thing you can do is set your own homelab and mini environment at home. This will get you more experience with actual administration and will be a great asset to disclose in interviews.
God help me if I ever end up with someone who just copies and pastes commands from chatgpt into a server
