script to replace macos legacy cli

replace_macos_legacy_cli.sh

#!/usr/bin/sh

###################################################
# Check if the brew path of the item exists
# then run brew install if not exits
# set the PATH and MANPATH for each item
###################################################

# check if brew is installed
if ! [ -x "$(command -v brew)" ]; then
  echo 'Error: brew is not installed.' >&2
  exit 1
fi

BREW_PATH="$(brew --prefix)/opt/"

# coreutils
BREW_ITEM_PATH="${BREW_PATH}coreutils"
if ! [ -d "$BREW_ITEM_PATH" ]; then
  echo "installing coreutils..."
  brew install coreutils
fi
export PATH="$(brew --prefix)/opt/coreutils/libexec/gnubin:$PATH"
export MANPATH="$(brew --prefix)/opt/coreutils/libexec/gnuman:$MANPATH"

# findutils
BREW_ITEM_PATH="${BREW_PATH}findutils"
if ! [ -d "$BREW_ITEM_PATH" ]; then
  echo "installing findutils..."
  brew install findutils
fi
export PATH="$(brew --prefix)/opt/findutils/libexec/gnubin:$PATH"
export MANPATH="$(brew --prefix)/opt/findutils/libexec/gnuman:$MANPATH"

# diffutils
BREW_ITEM_PATH="${BREW_PATH}diffutils"
if ! [ -d "$BREW_ITEM_PATH" ]; then
  echo "installing diffutils..."
  brew install diffutils
fi
export PATH="$(brew --prefix)/opt/diffutils/bin:$PATH"
export PATH="$(brew --prefix)/opt/diffutils/share/man:$PATH"

# gawk
BREW_ITEM_PATH="${BREW_PATH}gawk"
if ! [ -d "$BREW_ITEM_PATH" ]; then
  echo "installing gawk..."
  brew install gawk
fi
export PATH="$(brew --prefix)/opt/gawk/libexec/gnubin:$PATH"
export MANPATH="$(brew --prefix)/opt/gawk/libexec/gnuman:$MANPATH"

# gnu-sed
BREW_ITEM_PATH="${BREW_PATH}gnu-sed"
if ! [ -d "$BREW_ITEM_PATH" ]; then
  echo "installing gnu-sed..."
  brew install gnu-sed
fi
export PATH="$(brew --prefix)/opt/gnu-sed/libexec/gnubin:$PATH"
export MANPATH="$(brew --prefix)/opt/gnu-sed/libexec/gnuman:$MANPATH"

# gnu-tar
BREW_ITEM_PATH="${BREW_PATH}gnu-tar"
if ! [ -d "$BREW_ITEM_PATH" ]; then
  echo "installing gnu-tar..."
  brew install gnu-tar
fi
export PATH="$(brew --prefix)/opt/gnu-tar/libexec/gnubin:$PATH"
export MANPATH="$(brew --prefix)/opt/gnu-tar/libexec/gnuman:$MANPATH"

# gnu-which
BREW_ITEM_PATH="${BREW_PATH}gnu-which"
if ! [ -d "$BREW_ITEM_PATH" ]; then
  echo "installing gnu-which..."
  brew install gnu-which
fi
export PATH="$(brew --prefix)/opt/gnu-which/libexec/gnubin:$PATH"
export MANPATH="$(brew --prefix)/opt/gnu-which/libexec/gnuman:$MANPATH"

# grep
BREW_ITEM_PATH="${BREW_PATH}grep"
if ! [ -d "$BREW_ITEM_PATH" ]; then
  echo "installing grep..."
  brew install grep
fi
export PATH="$(brew --prefix)/opt/grep/libexec/gnubin:$PATH"
export MANPATH="$(brew --prefix)/opt/grep/libexec/gnuman:$MANPATH"

# less
BREW_ITEM_PATH="${BREW_PATH}less"
if ! [ -d "$BREW_ITEM_PATH" ]; then
  echo "installing less..."
  brew install less
fi
export PATH="$(brew --prefix)/opt/less/bin:$PATH"
export MANPATH="$(brew --prefix)/opt/less/share/man:$MANPATH"