adding some files

.bashrc

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+# ~/.bashrc: executed by bash(1) for non-login shells.
+# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
+# for examples
+
+# If not running interactively, don't do anything
+case $- in
+    *i*) ;;
+      *) return;;
+esac
+
+# don't put duplicate lines or lines starting with space in the history.
+# See bash(1) for more options
+HISTCONTROL=ignoreboth
+
+# append to the history file, don't overwrite it
+shopt -s histappend
+
+# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
+HISTSIZE=1000
+HISTFILESIZE=2000
+
+# check the window size after each command and, if necessary,
+# update the values of LINES and COLUMNS.
+shopt -s checkwinsize
+
+# If set, the pattern "**" used in a pathname expansion context will
+# match all files and zero or more directories and subdirectories.
+#shopt -s globstar
+
+# make less more friendly for non-text input files, see lesspipe(1)
+[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"
+
+# set variable identifying the chroot you work in (used in the prompt below)
+if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
+    debian_chroot=$(cat /etc/debian_chroot)
+fi
+
+# set a fancy prompt (non-color, unless we know we "want" color)
+case "$TERM" in
+    xterm-color|*-256color) color_prompt=yes;;
+esac
+
+# uncomment for a colored prompt, if the terminal has the capability; turned
+# off by default to not distract the user: the focus in a terminal window
+# should be on the output of commands, not on the prompt
+#force_color_prompt=yes
+
+if [ -n "$force_color_prompt" ]; then
+    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
+	# We have color support; assume it's compliant with Ecma-48
+	# (ISO/IEC-6429). (Lack of such support is extremely rare, and such
+	# a case would tend to support setf rather than setaf.)
+	color_prompt=yes
+    else
+	color_prompt=
+    fi
+fi
+
+if [ "$color_prompt" = yes ]; then
+    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
+else
+    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
+fi
+unset color_prompt force_color_prompt
+
+# If this is an xterm set the title to user@host:dir
+case "$TERM" in
+xterm*|rxvt*)
+    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
+    ;;
+*)
+    ;;
+esac
+
+# enable color support of ls and also add handy aliases
+if [ -x /usr/bin/dircolors ]; then
+    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
+    alias ls='ls --color=auto'
+    #alias dir='dir --color=auto'
+    #alias vdir='vdir --color=auto'
+
+    alias grep='grep --color=auto'
+    alias fgrep='fgrep --color=auto'
+    alias egrep='egrep --color=auto'
+fi
+
+# colored GCC warnings and errors
+#export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'
+
+# some more ls aliases
+alias ll='ls -alF'
+alias la='ls -A'
+alias l='ls -CF'
+
+# Add an "alert" alias for long running commands.  Use like so:
+#   sleep 10; alert
+alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'
+
+# Alias definitions.
+# You may want to put all your additions into a separate file like
+# ~/.bash_aliases, instead of adding them here directly.
+# See /usr/share/doc/bash-doc/examples in the bash-doc package.
+
+if [ -f ~/.bash_aliases ]; then
+    . ~/.bash_aliases
+fi
+
+# enable programmable completion features (you don't need to enable
+# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
+# sources /etc/bash.bashrc).
+if ! shopt -oq posix; then
+  if [ -f /usr/share/bash-completion/bash_completion ]; then
+    . /usr/share/bash-completion/bash_completion
+  elif [ -f /etc/bash_completion ]; then
+    . /etc/bash_completion
+  fi
+fi
+

.tmux.conf

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+# 0 is too far from ` ;)
+set -g base-index 1
+
+# Automatically set window title
+set-window-option -g automatic-rename on
+set-option -g set-titles on
+
+#set -g default-terminal screen-256color
+set -g status-keys vi
+set -g history-limit 10000
+
+setw -g mode-keys vi
+setw -g mouse on
+setw -g monitor-activity on
+
+bind-key v split-window -h
+bind-key s split-window -v
+
+bind-key J resize-pane -D 5
+bind-key K resize-pane -U 5
+bind-key H resize-pane -L 15
+bind-key L resize-pane -R 15
+
+bind-key M-j resize-pane -D
+bind-key M-k resize-pane -U
+bind-key M-h resize-pane -L
+bind-key M-l resize-pane -R
+
+# Vim style pane selection
+bind h select-pane -L
+bind j select-pane -D
+bind k select-pane -U
+bind l select-pane -R
+
+# Use Alt-vim keys without prefix key to switch panes
+bind -n M-h select-pane -L
+bind -n M-j select-pane -D
+bind -n M-k select-pane -U
+bind -n M-l select-pane -R
+
+# Use Alt-arrow keys without prefix key to switch panes
+bind -n M-Left select-pane -L
+bind -n M-Right select-pane -R
+bind -n M-Up select-pane -U
+bind -n M-Down select-pane -D
+
+# Shift arrow to switch windows
+bind -n S-Left  previous-window
+bind -n S-Right next-window
+
+# No delay for escape key press
+set -sg escape-time 0
+
+# Reload tmux config
+bind r source-file ~/.tmux.conf
+
+# bottom right status bar that highlights when prefix active
+set -g status-right ' #{?client_prefix,#[reverse]<Prefix>#[noreverse] ,}"#{=21:pane_title}" %H:%M %d-%b-%y'

shell.nix

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+{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/06278c77b5d162e62df170fec307e83f1812d94b.tar.gz") {} }:
+
+pkgs.mkShell {
+  buildInputs = [
+    pkgs.which
+    pkgs.htop
+    pkgs.zlib
+    pkgs.git
+    pkgs.gh
+    pkgs.curl
+    pkgs.python39
+    pkgs.podman
+    pkgs.tmux
+    pkgs.go
+    pkgs.postgresql
+    pkgs.neovim
+    pkgs.ripgrep
+    pkgs.nodejs
+    pkgs.cmake
+    pkgs.rustc
+    pkgs.cargo
+    pkgs.rustup
+  ];
+
+  shellHook = ''
+    echo hello
+  '';
+
+  MY_ENVIRONMENT_VARIABLE = "world";
+}
+