やったこと
less でログを見やすくするオプションを試しました。
調査
例えば、Rails のログをみるとします。
$ less log/development.log
Started GET "/" for ::1 at 2019-10-09 23:04:28 +0900
path is other
Processing by TasksController#index as HTML
ESC[1mESC[36mTask Load (1.3ms)ESC[0m ESC[1mESC[34mSELECT "tasks".* FROM "tasks" WHERE "tasks"."id" = ? LIMIT ?ESC[0m [["id", 1], ["LIMIT", 1]]
↳ app/controllers/tasks_controller.rb:7
Rendering tasks/index.html.erb within layouts/application
Rendered tasks/index.html.erb within layouts/application (1.8ms)
Completed 200 OK in 92ms (Views: 60.4ms | ActiveRecord: 1.8ms)-qR オプションつき
$ less -qR log/development.log
Started GET "/" for ::1 at 2019-10-09 23:04:28 +0900
path is other
Processing by TasksController#index as HTML
Task Load (1.3ms) SELECT "tasks".* FROM "tasks" WHERE "tasks"."id" = ? LIMIT ? [["id", 1], ["LIMIT", 1]]
↳ app/controllers/tasks_controller.rb:7
Rendering tasks/index.html.erb within layouts/application
Rendered tasks/index.html.erb within layouts/application (1.8ms)
Completed 200 OK in 92ms (Views: 60.4ms | ActiveRecord: 1.8ms)おまけ
ESC という文字が消えています。
-q は、ビープ音を鳴らさなくします。
-R は、ANSI Escape sequences をカラー表示します。
$ man less
> -q or --quiet or --silent
> -R or --RAW-CONTROL-CHARS