Creates a list of packages that I install for linux

pkg-get

#!/usr/bin/env bash

PKG_LIST_DIR=~/Downloads/package_list.txt
INSTALL="sudo apt-get"
REMOVE="sudo apt-get -r"
SEARCH="apt-cache search"

# Search for a package in the package manager
search(){
	for PKG in "$@"
	do
		eval "$SEARCH $PKG"
	done
}
# Tries to install a package and adds it to the list if successful
install()
{
	for PKG in "$@"
	do
		eval "$INSTALL $PKG" && echo -e "$PKG" >> $PKG_LIST_DIR
	done
}
# Tries to remove a package and removes it from the list if successful
remove(){
	for PKG in "$@"
	do
		eval "$REMOVE $PKG" && sed -i "/$PKG/d" $PKG_LIST_DIR
	done
}
# Displays the package list to the user sorted alphabetically
list()
{
	cat $PKG_LIST_DIR | sort
}
# Creates the file for the package list
set_up()
{
	touch $PKG_LIST_DIR
}
# Displays the command usage to the user
usage()
{
	echo "Usage: pkg-get [-hl] [-S package] [-R package]"
	echo "	install [package]	installs a package and logs it"
	echo "	remove [package]	removes a package from the system and list"
	echo "	list		lists all of the packages installed"
	echo "	help		shows the usage for the program"
	echo "	setup		sets up the package list for this command"
}

while [ "$1" != "" ]; do
	case $1 in
		search )
				shift # Shift the arguments all up a position
				search "$@"
				;;
		install )
				shift # Shift the arguments all up a position
				install "$@"
				;;
		remove )
				shift # Dont pass the positional parameters
				remove "$@"
				;;
		help )
				usage
				exit
				;;
		list )
				list
				exit
				;;
		setup )
				set_up
				exit
				;;
		* )
				usage
				exit
				;;
	esac
	shift
done