Linux-Documentation

Personal Linux hints and howtos

Managing system disk space

Get 10 largest folders/files in path du -a /home/ziga | sort -n -r | head -n 10 reference: https://www.cyberciti.biz/faq/linux-find-largest-file-in-directory-recursively-using-find-du/

Terminal standard output to clipboard

First you have to install xclip
sudo apt install xclip

Then you can save any output to clipboard:
cat ssh_key.pub | xclip -selection clipboard

You can also set alias for command (in .bashrc or .zshrc): alias copy="xclip -selection clipboard"

Then you can use: cat ssh_key.pub | copy

Multi terminal windows in one window

-> TMUX (for customization (ctrl+a and mouse click) see tmux conf file in same repo)

For using tabs in tmux use (ctrl+a c) which opens a new tab. To swithc between them use (ctr+a <tab_index>) To name each tab run inside tmux window session: tmux rename-window -t otherwindow newname

For naming each window you can install xpanes installation: https://github.com/greymd/tmux-xpanes/wiki/Installation

Common issue: all panes are synced by default Solution: use default shortcut (ctrl + b) :setw synchronize-panes off

For opening ssh connection and running htop on each ssh run:

xpanes -e 'ssh -t dewe-db "htop"' 'ssh -t dewe-production "htop"' 'ssh -t dewe-antares "htop"'

(Un)Mounting file systems on system boot

etc/fstab Example usage: Disable swp (swap) https://www.redhat.com/sysadmin/etc-fstab

You can also disable swap for current session only by running: sudo swapoff -a

Enabling new aliases without closing terminal

When installing packages that are adding new aliases to our system, we usually want to use them in same terminal session. This is possible with running command: source ~/.bashrc Although if you are using zsh or any other alternative to default bash terminal, make sure to source that config file instead.

transfering files (directory) to remote server and vice versa

Use command scp (secure copy).

sudo scp -r local_dir/ <USER>@<IP_ADDR>:<Destination_path>

Note: If you get permission denied, make sure that destination directory is owned by the same user you are transfering files with.

Note2: If you want to transfer files from remote machine to local, just change order of local dir and remote machine.