What this code block does:

I guess I just got tired of re-configuring my linux distros each time I installed a new one from scratch.
(copy and paste code below)

What this code block does:

create .nanorc

set constantshow

Always display the cursor position at the bottom of the editor

set linenumbers

Show line numbers on the left side of the editor

set numbercolor cyan,black

Set the color of the line numbers to cyan text on a black background

create .screenrc

hardstatus on

Turn on the hardstatus line

hardstatus alwaysfirstline

Place the hardstatus line at the top of the screen

hardstatus string '%{= wk}Screen: %S %= [%c]'

Customize the hardstatus line format
%{= wk} - Set text to white on black background
Screen: %S - Display "Screen: " followed by the session name (%S)
%= - Push everything after this to the far right
[%c] - Display current time in HH:MM format, surrounded by square brackets

defscrollback 10000

Set the scrollback buffer size to 10000 lines

defutf8 on

Enable UTF-8 support

startup_message off

Disable the startup message when screen starts

create .bashrc

Interactive Shell Check

case $- in  
    *i*) ;;  
      *) return;;  
esac

case $- in ... esac: This checks the current shell options.
i) ;;: If the shell is interactive (i is present in $-), do nothing (;;).
*) return;;: If the shell is not interactive, exit the script (return).

History Control

HISTCONTROL=ignoreboth

HISTCONTROL=ignoreboth: Sets the shell history to ignore duplicate entries and commands that start with a space.

Append to History

shopt -s histappend

shopt -s histappend: Enables appending to the history file, rather than overwriting it.

History Size

HISTSIZE=1000  
HISTFILESIZE=2000

HISTSIZE=1000: Sets the number of commands to remember in the command history.
HISTFILESIZE=2000: Sets the maximum number of lines contained in the history file.

Check Window Size

shopt -s checkwinsize

shopt -s checkwinsize: After each command, checks the window size and updates LINES and COLUMNS if necessary.

Debian Chroot

if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then  
    debian_chroot=$(cat /etc/debian_chroot)  
fi

Checks if the debian_chroot variable is unset or empty and if /etc/debian_chroot is readable.
If both conditions are met, it sets debian_chroot to the contents of /etc/debian_chroot.

Terminal Color Check

case "$TERM" in  
    xterm-color|*-256color) color_prompt=yes;;  
esac

Checks if the terminal supports color (xterm-color or *-256color).
If so, sets color_prompt=yes.

Color Prompt Setup

if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then  
    color_prompt=yes  
else  
    color_prompt=  
fi

Checks directly whether tput exists and can set terminal colors.
If so, sets color_prompt=yes, otherwise sets it empty.
(Dropped the old force_color_prompt variable — it was just an unconditional yes immediately followed by this same check, so it wasn't doing anything useful.)

PS1 Prompt Definition

if [ "$color_prompt" = yes ]; then
    if [ "$(id -u)" -eq 0 ]; then
        PS1='${debian_chroot:+($debian_chroot)}\[\033[5;31m\]\u\[\e[25m\]@\h\[\033[00m\]:\[\033[01;34m\]\w #\[\033[00m\] '
    else
        PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w \$\[\033[00m\] '
    fi
else
    if [ "$(id -u)" -eq 0 ]; then
        PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w # '
    else
        PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w \$ '
    fi
fi
unset color_prompt force_color_prompt

Sets the prompt (PS1) based on whether color_prompt is set.
If the user is root (id -u equals 0), the prompt ends with #, otherwise with $.
The colors are different for root (red) and non-root users (green).
Sets the prompt (PS1) based on whether color_prompt is set.
If the user is root (id -u equals 0), the prompt ends with #, otherwise with $.
The colors are different for root (red) and non-root users (green).

Xterm Title

case "$TERM" in  
xterm*|rxvt*)  
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"  
    ;;  
*)  
    ;;  
esac

If the terminal is xterm or rxvt, sets the terminal title to user@host: dir.

Enable Color Support for ls and Define Aliases

if [ -x /usr/bin/dircolors ]; then 
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)" 
    alias ls='ls --color=auto' 
    alias grep='grep --color=auto' 
    alias fgrep='fgrep --color=auto' 
    alias egrep='egrep --color=auto' 
fi

Checks if dircolors exists and is executable.
If ~/.dircolors is readable, evaluates it for setting up color definitions.
Sets up color aliases for ls, grep, fgrep, and egrep.

Define diffy Function

diffy() {  
    diff -y -B <(grep -vE '^\s*#' "$1") <(grep -vE '^\s*#' "$2")  
}

Defines the diffy function to compare two files, ignoring lines that start with a comment (#) or are empty.

Define catta Function

catta() {  
    local target="${1:-./*}"  
    while IFS= read -r texts; do  
        echo -e "\n\n    \e[4m\e[93m${texts}\e[0m\n"  
        cat "${texts}"  
    done < <(file -- ${target}* 2>/dev/null | grep text | sed 's/:.*//')  
}

Defines the catta function to display contents of text files.
If a file pattern is provided, it processes files matching the pattern; otherwise it processes everything in the current directory.
Each file's name is highlighted and separated for readability.
Rewritten to use a while read loop to prevent globbing

Define Aliases

alias ll='ls -l'  
alias la='ls -la'  
alias lh='ls -lah'  
alias cd..='cd ..'  
alias update='apt update -y && apt upgrade -y && apt full-upgrade -y'

Sets up aliases for common ls commands and a cd shortcut for a common typo I make.
update runs everything apt needs in one go. (Dropped the separate dist-upgrade call — on modern apt it's just an alias for full-upgrade, so running both back to back was redundant. Also renamed from go to update since it's clearer at a glance what it does.)

Load Additional Aliases

if [ -f ~/.bash_aliases ]; then  
    . ~/.bash_aliases  
fi

If ~/.bash_aliases exists, sources it to load additional aliases.

Enable Programmable Completion

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

If the shell is not in POSIX mode, checks for bash_completion files and sources them to enable programmable completion features.

Outside of .bashrc

Static IP Assignment (currently disabled)

This whole block is commented out for now — I'm relying on DHCP reservations at the router instead of setting static IPs on the host itself.
Left the functions in place (commented) in case I want to switch back to static addressing later: GETINTERFACE detects DHCP interfaces in /etc/network/interfaces (and asks you to pick if there's more than one), GETIP/GETMASK/GETGATE prompt for and validate IPv4 addresses, and SETSTATIC backs up /etc/network/interfaces before rewriting the relevant interface to static.

Show MAC Address(es) for DHCP Reservation

echo -e "\n  MAC address(es) for DHCP reservation:\n"  
ip -o link show | awk -F': ' '{print $2}' | while read -r iface; do  
  [[ "$iface" == "lo" ]] && continue  
  mac=$(cat "/sys/class/net/$iface/address" 2>/dev/null)  
  [[ -n "$mac" ]] && echo "    $iface: $mac"  
done

Lists every network interface (skipping loopback) and prints its MAC address straight from /sys/class/net/*/address.
Since I'm doing reservations instead of static config now, this gives me what I actually need to copy into the router/DHCP server.

Add Curl and Sudo

Checks if we can resolve names; if not, adds Cloudflare and Quad9 nameservers (backing up the original file first). If we're root, installs curl and sudo.

if ! getent hosts www.google.com &>/dev/null; then  
  if [[ $(grep -vcE '^$|^#' /etc/resolv.conf) -eq 0 ]]; then  
    cp /etc/resolv.conf /etc/resolv.conf.bak.$(date +%s) 2>/dev/null  
    echo -e "\nnameserver 1.1.1.2\nnameserver 9.9.9.9" >> /etc/resolv.conf  
    sleep 3  
    if ! getent hosts www.google.com &>/dev/null; then  
      echo -e "    ALERT!\nAdded Cloudflare and Quad9 nameservers, but still not resolving domain names!"  
    else  
      [[ $(id -u) -eq "0" ]] && apt update -y && apt upgrade -y && apt install -y curl sudo  
    fi  
  fi  
fi

Switched the reachability check from ping to getent hosts, since it tests actual DNS resolution rather than ICMP reachability (some networks block ping but resolve fine, which was giving false alarms before).
Also fixed the regex that checks whether /etc/resolv.conf is effectively empty — it was '^$^#' (broken) and is now '^$|^#' (blank lines or comments).
Now backs up /etc/resolv.conf with a timestamp before appending nameservers, just in case.

.bash_profile

Link

COPY PASTA

cat <<"EOF" > ~/.bashrc
case $- in
    *i*) ;;
      *) return;;
esac
HISTCONTROL=ignoreboth
shopt -s histappend
HISTSIZE=1000
HISTFILESIZE=2000
shopt -s checkwinsize
if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)
fi
case "$TERM" in
    xterm-color|*-256color) color_prompt=yes;;
esac
if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
    color_prompt=yes
else
    color_prompt=
fi
if [ "$color_prompt" = yes ]; then
    if [ "$(id -u)" -eq 0 ]; then
        PS1='${debian_chroot:+($debian_chroot)}\[\033[5;31m\]\u\[\e[25m\]@\h\[\033[00m\]:\[\033[01;34m\]\w #\[\033[00m\] '
    else
        PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w \$\[\033[00m\] '
    fi
else
    if [ "$(id -u)" -eq 0 ]; then
        PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w # '
    else
        PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w \$ '
    fi
fi
unset color_prompt force_color_prompt
case "$TERM" in
xterm*|rxvt*)
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
    ;;
*)
    ;;
esac
if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto'
    alias grep='grep --color=auto'
    alias fgrep='fgrep --color=auto'
    alias egrep='egrep --color=auto'
fi
diffy() {
    diff -y -B <(grep -vE '^\s*#' "$1") <(grep -vE '^\s*#' "$2")
}
catta() {
    local target="${1:-./*}"
    while IFS= read -r texts; do
        echo -e "\n\n    \e[4m\e[93m${texts}\e[0m\n"
        cat "${texts}"
    done < <(file -- ${target}* 2>/dev/null | grep text | sed 's/:.*//')
}
alias ll='ls -l'
alias la='ls -la'
alias lh='ls -lah'
alias cd..='cd ..'
alias update='apt update -y && apt upgrade -y && apt full-upgrade -y'
if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi
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
EOF

cat <<"EOF" > ~/.nanorc
set constantshow
set linenumbers
set numbercolor cyan,black
EOF

# --- Static IP assignment (disabled — using DHCP reservations instead) ---
#
# INTERFACE=""
# IPADD=""
# IPMASK=""
# IPGATE=""
#
# OCTET='(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])'
# IPV4_RE="^${OCTET}\.${OCTET}\.${OCTET}\.${OCTET}\$"
#
# GETINTERFACE() {
#   mapfile -t IFACES < <(grep -E '^iface.*inet dhcp$' /etc/network/interfaces | awk '{print $2}')
#   if [[ ${#IFACES[@]} -eq 0 ]]; then
#     echo "No DHCP interfaces found in /etc/network/interfaces. Skipping static IP setup."
#     return 1
#   elif [[ ${#IFACES[@]} -gt 1 ]]; then
#     echo "Multiple DHCP interfaces found: ${IFACES[*]}"
#     read -rp "  Which interface do you want to make static? " INTERFACE
#     if [[ ! " ${IFACES[*]} " =~ " ${INTERFACE} " ]]; then
#       echo "Invalid selection."
#       return 1
#     fi
#   else
#     INTERFACE="${IFACES[0]}"
#   fi
#   return 0
# }
#
# GETMASK() {
#   read -rp "
#   What should the netmask be (IP address, not CIDR)?
# " IPMASK
#   if [[ ! $IPMASK =~ $IPV4_RE ]]; then
#     echo "Please use a valid x.x.x.x netmask."
#     GETMASK
#   fi
# }
#
# GETGATE() {
#   read -rp "
#   What should the Gateway be?
# " IPGATE
#   if [[ ! $IPGATE =~ $IPV4_RE ]]; then
#     echo "Please use a valid x.x.x.x gateway address."
#     GETGATE
#   fi
# }
#
# GETIP() {
#   echo -e "  Current IP is: $(ip a | grep inet | grep -vE 'host lo|inet6' | awk '{print $2}')"
#   read -rp "
#   What should the IP be for this host?
# " IPADD
#   if [[ ! $IPADD =~ $IPV4_RE ]]; then
#     echo "Please give a valid IPv4 address (no netmask)."
#     GETIP
#   fi
# }
#
# SETSTATIC() {
#   cp /etc/network/interfaces /etc/network/interfaces.bak.$(date +%s)
#   sed -i "s/iface $INTERFACE inet dhcp/iface $INTERFACE inet static/" /etc/network/interfaces
#   echo -e "    address $IPADD\n    netmask $IPMASK\n    gateway $IPGATE" >> /etc/network/interfaces
# }
#
# if [[ $(id -u) -eq 0 ]]; then
#   if grep -q dhcp /etc/network/interfaces; then
#     if GETINTERFACE; then
#       GETIP
#       GETMASK
#       GETGATE
#       SETSTATIC
#     fi
#   fi
# fi

# --- Show MAC address(es) for DHCP reservation ---
echo -e "\n  MAC address(es) for DHCP reservation:\n"
ip -o link show | awk -F': ' '{print $2}' | while read -r iface; do
  [[ "$iface" == "lo" ]] && continue
  mac=$(cat "/sys/class/net/$iface/address" 2>/dev/null)
  [[ -n "$mac" ]] && echo "    $iface: $mac"
done
echo ""

if ! getent hosts www.google.com &>/dev/null; then
  if [[ $(grep -vcE '^$|^#' /etc/resolv.conf) -eq 0 ]]; then
    cp /etc/resolv.conf /etc/resolv.conf.bak.$(date +%s) 2>/dev/null
    echo -e "\nnameserver 1.1.1.2\nnameserver 9.9.9.9" >> /etc/resolv.conf
    sleep 3
    if ! getent hosts www.google.com &>/dev/null; then
      echo -e "    ALERT!
Added Cloudflare and Quad9 nameservers, but still not resolving domain names!"
    else
      [[ $(id -u) -eq 0 ]] && apt update -y && apt upgrade -y && apt install -y curl sudo
    fi
  fi
fi

source ~/.bashrc

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Repository files navigation

What this code block does:

create .nanorc

create .screenrc

create .bashrc

Interactive Shell Check

History Control

Append to History

History Size

Check Window Size

Debian Chroot

Terminal Color Check

Color Prompt Setup

PS1 Prompt Definition

Xterm Title

Enable Color Support for ls and Define Aliases

Define diffy Function

Define catta Function

Define Aliases

Load Additional Aliases

Enable Programmable Completion

Outside of .bashrc

Static IP Assignment (currently disabled)

Show MAC Address(es) for DHCP Reservation

Add Curl and Sudo

.bash_profile

COPY PASTA

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Name		Name	Last commit message	Last commit date
Latest commit History 123 Commits
apt		apt
work		work
.bashrc		.bashrc
.nanorc		.nanorc
.screenrc		.screenrc
README.md		README.md
bashcolours.sh		bashcolours.sh

Folders and files

Latest commit

History

Repository files navigation

What this code block does:

create .nanorc

create .screenrc

create .bashrc

Interactive Shell Check

History Control

Append to History

History Size

Check Window Size

Debian Chroot

Terminal Color Check

Color Prompt Setup

PS1 Prompt Definition

Xterm Title

Enable Color Support for ls and Define Aliases

Define diffy Function

Define catta Function

Define Aliases

Load Additional Aliases

Enable Programmable Completion

Outside of .bashrc

Static IP Assignment (currently disabled)

Show MAC Address(es) for DHCP Reservation

Add Curl and Sudo

.bash_profile

COPY PASTA

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