How to check the battery's status on the terminal (Linux)

See this page of askubuntu: https://askubuntu.com/questions/69556/how-do-i-check-the-batterys-status-via-the-terminal

確率論的野鳥（2023/10/9現在）

自分の.emacsの野鳥設定部分のうち数学記号部分のみを記しておく．ただし，多分に確率論風．

(setq YaTeX-math-sign-alist-private
 '(
;;;   ("q"         "Q"          "(Q)")
;;;   ("z"         "Z"          "ZZ")
;;;   ("t"         "text"          "text")
   ("bb"        "mathbb"        "\mathbb{}")
   ("mb"        "mathbf"        "\mathbf{}")
   ("mc"        "mathcal"       "\mathcal{}")
   ("qu"        "quad"          "__")
   ("qq"        "qquad"         "____")
   ("ls"        "varlimsup"     "___\nlim")
   ("li"        "varliminf"     "lim\n---")
   ("il"        "varinjlim"     "lim\n-->")
   ("pl"        "varprojlim"    "lim\n<--")
   ("ae"        "textrm{ a.e. }"  "a.e.")
   ("as"        "textrm{ a.s. }"  "a.s.")
   ("qe"        "textrm{ q.e. }"  "q.e.")
   ("st"        "textrm{ s.t. }"  "s.t.")
   ("capa"      "textrm{Cap}"   "Cap")
   ("supp"      "textrm{supp }" "supp ")
   ("Li"        "lim"           "lim")
   ("limi"      "liminf"        "liminf")
   ("lims"      "limsup"        "limsup")
   ("pi"        "prod"          "Π")
   ("U"         "bigcup"        "∪")
   ("UU"        "bigcap"        "∩")
   ("/o"        "emptyset"      "Φ")
   ("bigop"     "bigoplus"      "_\n(+)~")
   ("bigot"     "bigotimes"     "_\n(x)\n ~")
   ))