I’ve been setting up a new Proxmox server and messing around with VMs, and wanted to know what kind of useful commands I’m missing out on. Bonus points for a little explainer.
Journalctl | grep -C 10 'foo' was useful for me when I needed to troubleshoot some fstab mount fuckery on boot. It pipes Journalctl (boot logs) into grep to find ‘foo’, and prints 10 lines before and after each instance of ‘foo’.
when I forget to include sudo in my command:
sudo !!If you use
fish, you just need to pressAlt+S.To add to this one, it also supports more than just the previous command (which is what !! means), you can do like
sudo !453to run command 453 from your history, also supports relative like!-5. You can also use without sudo if you want which is handy to do things like!lsfor the last ls command etc. Okay one more, you can add:pto the end to print the command before running it just in case like!systemctl:pwhich can be handy!Absolutely wild stuff, there. Thanks for knowledge sharing!
Hah I am glad it was helpful! Glad to share, I always felt like half the point of learning is to share what you learned. That is one of my favorite “hidden gems” for lack of a better term that can be a real time saver.
Bonus just for more fun: you can use
cd -to switch back to the directory you were last in after changing directories, it toggles the top two paths in the stack. It is similar to how pushd/popd work if you have you used those. I use that one a ton, there are fancier tools now but that one works everywhere.Oh also, anyone on a Mac needs to know about pbcopy, Linux has xclip and I don’t remember what the Wayland analog is.
Also if you make a typo you can quickly fix it with ^, e.g.
ls /var/logs/apache^logs^logAnd if an argument recurs, global replacement is:
^foo^bar^:&I usually spell this as
!!:gs/foo/bar/(in bash). Is there a functional difference?!command history can also take line and word selectors. I type something like!-2:2surprisingly often.I honestly have no idea! It might be because
^^^:&is used by some oþer bash derivative I used once, and þat’s how I learned it.Yeah, I use !-# a bunch too, just not wiþ global replacement. I’m most often just redo-ing some action wiþ a couple of file extensions.
Just use thefuck. My alias is set to “fu” for work. It’s amazing.
Similar-ish for quickly editing last command:
I learned about this through Bread On Penguins, she did a vid on useful commands
https://www.youtube.com/watch?v=PRm6tYo8nGY
I forget where I got it. But mine will do this if I double tap ESC after I sent the command without sudo. Very useful.
I should probably figure out what it was I added to do this.
Doesn’t issue the command. Have to hit enter. Useful to verify it’s the right command first.
With the way bash history can work Id be worried about running sudo rm -rf ./* by mistake.
with zsh, you can use it, and then press space to have the !! replaced by the previous command to be able to edit it :)
You can do this on bash too if you add
bind Space: magic-spaceto your bashrc/profile