_exists() { (( $+commands[$1] )) }

_exists less			&& export PAGER=less

if _exists vim; then
		export EDITOR=vim
		alias vim="vim -p"
fi

unfunction _exists

alias ls="ls --color=always -h"
alias ll="ls -lah"
alias mkdir="mkdir -p"
alias ...="cd ../.."
alias foldersize="du -sh"
alias duf="du -sk * | sort -n | while read size fname; do for unit in k M G T P E Z Y; do if [ $size -lt 1024 ]; then echo -e "${size}${unit}\t${fname}"; break; fi; size=$((size/1024)); done; done"
alias google="ping -c 10240000 google.com"
alias history="history -i"

case `uname` in
  Darwin)
    # commands for OS X go here
    alias flushdns="dscacheutil -flushcache && killall -HUP mDNSResponder"
    alias emptytrash="sudo rm -rfv /Volumes/*/.Trashes; sudo rm -rfv ~/.Trash; sudo rm -rfv /private/var/log/asl/*.asl"
    alias r="open -a"
    alias ydl="youtube-dl -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best'"
    alias nmap_localnet="nmap -sP 10.0.3.0/24"
		alias fetch="curl -O"
		alias htop="sudo htop"
		alias sulast="sudo $(history -p !-1)"
  ;;
  Linux)
    # commands for Linux go here
  ;;
  FreeBSD)
    # commands for FreeBSD go here
    alias stl="sockstat -l"
		alias sulast="doas $(history -p !-1)"
  ;;
esac