Platform check

Python 3.9.21 (main, Dec  5 2024, 00:00:00) 
[GCC 11.5.0 20240719 (Red Hat 11.5.0-2)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import platform
>>> platform.system()
'Linux'
>>> platform.processor()
'aarch64'
>>> platform.platform()
'Linux-5.14.0-503.23.1.el9_5.aarch64+64k-aarch64-with-glibc2.34'
>>> platform.machine()
'aarch64'
>>> platform.uname()
uname_result(system='Linux', node='k093', release='5.14.0-503.23.1.el9_5.aarch64+64k', version='#1 SMP PREEMPT_DYNAMIC Thu Feb 6 07:14:16 EST 2025', machine='aarch64')

SSH

# exits with command running in background to prevent stopping it
ssh localhost -f 'screen -d -m sleep 60' 

Shell

# Bash
if [ -t 1 ]; then
    # standard output is a TTY
    ...
fi

# Find current user's shell
echo $SHELL
# Find currently RUNNING shell
echo $0
#
ps -p $$

ZSH

# Find aliases
zsh -ixc : -o sourcetrace 2>&1 | grep -w alias

# Show all sourced files
zsh -i -o sourcetrace -c :

# save aliases to file after creating them on-the-fly
alias sa="alias -L > ~/.zsh_aliases"

# show hostname on prompt
PROMPT="%{$fg[magenta]%}%n%{$reset_color%}@%{$fg[blue]%}%m %{$fg[yellow]%}%1~ %{$reset_color%}%# "

Apptainer

apptainer completion zsh >> ~/.oh-my-zsh/completions/_apptainer

Docker

# From within container
echo $HOSTNAME # find hash name of current container

# From outside container
docker start  `docker ps -q -l` # restart it in the background
docker attach `docker ps -q -l` # reattach the terminal & stdin 

docker run --gpus all <IMAGE_NAME> nvidia-smi
# check that GPUs are visible within container


docker ps -aq --filter ancestor=<IMAGE_NAME>
# q quiet (only UUID output)
# a all (show non-running containers)
# filter for all from a particular image 

# can define container names using --name for later reference

Useful commands

# Show full paths of directories
$ ls -d $PWD/*

Resource monitoring

# refresh every 0.1 seconds 
watch -n0.1 nvidia-smi

htop
atop
nvtop # NVIDIA devices

Screen

# To list all of the screen sessions for a user, run the following command as that user:
screen -ls

# To see all screen sessions on a specific machine you can do:
ls -laR /var/run/screen/

screen -x [screen id] - Connect / Attach to a specific running screen.

Ctrl + D - while in a screen to Terminate / Stop a screen from running.

Ctrl + A, Then press D - while in a screen to detach from screen without disturbing it.

killall screen - Detach or terminate all screens.

# will go to the end and continually load the latest contents of the file.
# i.e. used to monitor tail of file as it grows. 
less +F filename

# run command initially `+` and go to bottom of page `G`
less +G filename

Shell aliases

. ~/.zsh_aliases 


# alternatively 
for config (~/.zsh/*.zsh) source $config

Fixes

# `conda` not recognised in zsh
source /opt/anaconda3/bin/activate

Migration

# install oh-my-zsh
sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

# install conda
wget https://repo.anaconda.com/archive/Anaconda3-2024.02-1-Linux-x86_64.sh

# run install script...
# TODO

# add to path
source /path/to/anaconda3/bin/activate
# if installed for all users: source /opt/anaconda3/bin/activate

conda init zsh

# for bash: conda init

# check working
conda list

#