What are the differences between set -g, set -ga and set-option -g in a .tmux.conf file?

by

set is the alias of set-option.

set -g is used to set global options and -ga appends values to existing settings.

From Tmux’s man page:

With -a, and if the option expects a string or a style, value is
appended to the existing setting. For example:

   set -g status-left "foo"
   set -ag status-left "bar"

Will result in ‘foobar’. And:

   set -g status-style "bg=red"
   set -ag status-style "fg=blue"

Will result in a red background and blue foreground. Without -a, the
result would be the default background and a blue foreground.

set-window-option (alias setw) is used to configure window options (allow-rename, mode-keys, synchronize-panes, etc.) and the same flag options are available.

See:

  • https://linux.die.net/man/1/tmux
  • https://superuser.com/questions/758843/difference-between-global-server-session-and-window-options

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