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Showing content from https://unix.stackexchange.com/questions/148/colorizing-your-terminal-and-shell-environment below:

bash - Colorizing your terminal and shell environment?

Colors for man pages (more detail):

function _colorman() {
  env \
    LESS_TERMCAP_mb=$'\e[1;35m' \
    LESS_TERMCAP_md=$'\e[1;34m' \
    LESS_TERMCAP_me=$'\e[0m' \
    LESS_TERMCAP_se=$'\e[0m' \
    LESS_TERMCAP_so=$'\e[7;40m' \
    LESS_TERMCAP_ue=$'\e[0m' \
    LESS_TERMCAP_us=$'\e[1;33m' \
    LESS_TERMCAP_mr=$(tput rev) \
    LESS_TERMCAP_mh=$(tput dim) \
    LESS_TERMCAP_ZN=$(tput ssubm) \
    LESS_TERMCAP_ZV=$(tput rsubm) \
    LESS_TERMCAP_ZO=$(tput ssupm) \
    LESS_TERMCAP_ZW=$(tput rsupm) \
    GROFF_NO_SGR=1 \
      "$@"
}
alias man="LANG=C _colorman man"
function perldoc() { command perldoc -n less "$@" |man -l -; }

Colors for grep (1;32 is bright green, see other posts here for other colors):

GREP_OPTS='--color=auto'      # for aliases since $GREP_OPTIONS is deprecated
GREP_COLOR='1;32'             # (legacy) bright green rather than default red
# (new) Matching text in Selected line = green, line numbers dark yellow
GREP_COLORS="ms=${GREP_COLOR}:mc=${GREP_COLOR}:ln=33"
alias grep='grep $GREP_OPTS'
alias egrep='grep -E $GREP_OPTS'
alias fgrep='LC_ALL=C grep -F $GREP_OPTS'

Using LC_ALL=C for fgrep can provide a 140x performance boost

More colors for GNU ls:

# use the config at ~/.dircolors if it exists, otherwise generate anew
eval "$( dircolors --sh $(find ~/.dircolors -size +0 2>/dev/null) )"

# Usage: _ls_colors_add BASE NEW [NEW...]
# Have LS color given NEW extensions the way BASE extension is colored
_ls_colors_add() {
  local BASE_COLOR="${LS_COLORS##*:?.$1=}" NEW
  if [ "$LS_COLORS" != "$BASE_COLOR" ]; then
    BASE_COLOR="${BASE_COLOR%%:*}"
    shift
    for NEW in "$@"; do
      if [ "$LS_COLORS" = "${LS_COLORS#*.$NEW=}" ]; then
        LS_COLORS="${LS_COLORS%%:}:*.$NEW=$BASE_COLOR:"
      fi
    done
  fi
  export LS_COLORS
}

_ls_colors_add zip jar xpi            # archives
_ls_colors_add jpg ico JPG PNG webp   # images
_ls_colors_add ogg opus               # audio (opus now included by default)

export CLICOLOR=1   # BSD auto-color trigger (like  ls -G  but for everything)
if ls -ld --color=auto / >/dev/null 2>&1
  then alias ls="ls -ph --color=auto"
  else alias ls="ls -ph"
fi

Install grc (Generic Colouriser) and add it to your aliases:

if type grc grcat >/dev/null 2>&1; then
  colourify() {  # using this as a function allows easier calling down lower
    if [[ -t 1 || -n "$CLICOLOR_FORCE" ]]
      then ${GRC:-grc} -es --colour=auto "$@"
      else "$@"
    fi
  }

  # loop through known commands plus all those with named conf files
  for cmd in g++ head ld ping6 tail traceroute6 `locate grc/conf.`; do
    cmd="${cmd##*grc/conf.}"  # we want just the command
    type "$cmd" >/dev/null 2>&1 && alias "$cmd"="colourify $cmd"
  done

  # This needs run-time detection. We even fake the 'command not found' error.
  configure() {
    if [[ -x ./configure ]]; then
      colourify ./configure "$@"
    else
      echo "configure: command not found" >&2
      return 127
    fi
  }

  unalias ll 2>/dev/null
  ll() {
    if [[ -n "$CLICOLOR_FORCE" || -t 1 ]]; then  # re-implement --color=auto
      ls -l --color=always "$@" |grcat conf.ls
      return ${PIPESTATUS[0]} ${pipestatus[1]} # exit code of ls via bash or zsh
    fi
    ls -l "$@"
  }
fi

Colors for diff: Too much content for a function, use a script and alias it in your rc file (unnecessary if you installed grc):

#!/usr/bin/perl
use strict;
use warnings;

open (DIFF, "-|", "diff", @ARGV) or die $!;

my $ydiff = 1;
while (<DIFF>) {
  if (not -t 1) {
    print;
    next;
  }
  chomp;
  $ydiff = 0 if /^[ <>\@+-]/ or ($. == 1 && /^\d+[a-z]{1,5}\d+$/);
  my $color = "";
  if (! $ydiff && /^[\@+-<>]/) {
    $color = (/^[<-](?!--$)/ ? 1 : /^[+>]/ ? 2 : 5);
  } elsif ($ydiff && /\t {6}([<|>])(?:\t|$)/) {
    $color = ($1 eq "<" ? 1 : $1 eq ">" ? 2 : 4);
  }
  $color ? printf ("\e[1;3%dm%s\e[0;0m\n",$color,$_) : print "$_\n";
}
close DIFF;

Colors for bash prompt:

# Shorten home dir, Cygwin drives, paths that are too long
function PSWD() {
  local p="$*" space A B cols="${COLUMNS:-`tput cols 2>/dev/null || echo 80`}"
  p="${p/$HOME/\~}"         # shrink home down to a tilde
  if [ -d /cygdrive ] && [ "${p#/cygdrive/?/}" != "$p" ]; then
    p="${p:10:1}:${p:11}"   # /cygdrive/c/hi -> c:/hi
  fi
  space="$((${#USER}+${#HOSTNAME}+6))"  # width w/out the path
  if [ "$cols" -lt 60 ]; then echo -n "$N "; space=-29; p="$p$N\b"; fi
  if [ "$cols" -lt "$((space+${#p}+20))" ]; then # < 20 chars for the command
    A=$(( (cols-20-space)/4 ))      # a quarter of the space (-20 for cmd)
    if [ $A -lt 4 ]; then A=4; fi   # 4+ chars from beginning
    B=$(( cols-20-space-A*2 ))      # half (plus rounding) of the space
    if [ $B -lt 8 ]; then B=8; fi   # 8+ chars from end
    p="${p:0:$A}..${p: -$B}"
  fi
  echo "$p"
}

PSC() { printf $'\[\e[%sm\]' "${*:-0;0}"; }
PR="0;32"       # default color used in prompt is green
if [ "$(id -u)" = 0 ]; then
    sudo=41     # root is red background
  elif [ "$USER" != "${SUDO_USER:-$USER}" ]; then
    sudo=31     # not root, not self: red text
  else sudo="$PR"   # standard user color
fi
PROMPT_COMMAND='[ $? = 0 ] && PS1=${PS1[1]} || PS1=${PS1[2]}'
PSbase="$(PSC $sudo)\u$(PSC $PR)@\h $(PSC 33)\$(PSWD \w)"
PS1[1]="$PSbase$(PSC $PR)\$ $(PSC)"
PS1[2]="$PSbase$(PSC  31)\$ $(PSC)"
PS1="${PS1[1]}"
unset sudo PR PSbase

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