This was quite a head-scratcher. I wanted to remove a user sammy from the sudo group and did that by running this as root
root> deluser sammy sudo
However, when I logged in as sammy I was still able to run –
sammy> sudo su
Checking which groups the user belonged to was of no help either.
sammy> groups sammyContinue reading
I’ve long been a user of DBeaver which works so well across different OSes, so recently I wanted to set up the cloud version called cloudbeaver.
In the course of doing that, I had to generate SSH keys to be able to access remote databases via SSH.
The standard way of generating SSH keys is to run this command.
> ssh-keygen -t rsa
This by default creates id_rsa and id_rsa.pub under <home directory>/.ssh folder (both in Windows and Linux)
Every time I need to check the current version of Ubuntu, I have to run
$> lsb_release -a
But what if lsb_release is not installed?
The easiest way is to run
$> cat /etc/*release
This gives me an output like this!
There’s been a number of times I’ve wanted to not include some commands that I type into bash from being added to bash_history
The most convenient is to start a subshell by typing in bash again. This ensures that the commands in the subshell don’t get added to the history.
There are additional ways of achieving this as well.
Continue readingIn the Windows explorer address bar enter –
\\wsl$
While running a cron job in Linux, I sometimes get this error and I had been struggling to solve this until I came across this post.
Although that particular post mentions the cause being Vagrant, mine was due to a cron job.
First the solution …
.profile under home folderOpen ~/.profile
Replace the following line –
mesg n || true
with
tty -s && mesg n
The reason for this is given very well in the post linked above.
Continue readingEvery time I need to create, modify, grant sudo access to users in Linux, I have to search for it.
This is a list of the commands I’ve used in the past.
Will keep updating this so that I don’t have to load a search page every time!
All commands below are run as root user. If I’m not the root user, I need to prefix them with sudo!
As mentioned in the previous post, if you need to run cron jobs in linux, knowing how to debug them via mail is really important.
By the way, mail is the older program, the link above is to the man page of mailx which is the newer program created relatively recently, in 1986!
Navigating through messages in the mailbox is quite a challenge as I found.
So I decided to create a list of the commands which I used most frequently and found useful.
Continue readingSo, we set up a project on a new Digital Ocean droplet and the cron jobs started failing.
Not just that, the log file that we had set up to track the cron was showing up empty!
After a lot of head scratching, I had a look at /var/log/syslog
Starting up another computer on a network itself is such a fascinating idea! For me, it literally feels like magic!
There are so many things involved. The computer which needs to be started (or woken up) has to have the capability, both at the hardware and the software level.
Also the computer doing the waking needs to send a magic packet!
When I initially heard this, I honestly thought this was a joke of some kind. A magic packet? Really?
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