dirs.txt

  alias ll="ls -l --group-directories-first --color=auto"
  alias ls='ls -hF --color=auto'   # add colors for filetype recognition
  alias la='ls -Al --color=auto'   # show hidden files
  alias lx='ls -lXB --color=auto'  # sort by extension
  alias lk='ls -lSr --color=auto'  # sort by size, biggest last
  alias lc='ls -ltcr --color=auto' # sort by and show change time, most recent last
  alias lu='ls -ltur --color=auto' # sort by and show access time, most recent last
  alias lt='ls -ltr --color=auto'  # sort by date, most recent last
  alias lr='ls -lR --color=auto'   # recursive ls
  alias dir='dir --color=auto'     # add colors
  alias vdir='vdir --color=auto'   # add colors
  alias grep='grep --color=auto'   # add colors
  alias fgrep='fgrep --color=auto' # add colors
  alias egrep='egrep --color=auto' # add color