libtmux:set-buffer

Store literal DATA in a named or automatic buffer; return a COMMAND-OUTCOME. DATA is a NUL-free string or an octet vector. Strings use tmux set-buffer; octets use its load-buffer stdin path and preserve NUL and invalid UTF-8. APPEND is available only for strings. Empty DATA is tmux's no-op and preserves an existing buffer. NAME is literal; omission creates an automatic name. New names reject backslashes, ASCII controls and DEL before I/O because tmux versions otherwise rewrite or reject them. Spaces and Unicode are supported. Signals INVALID-ARGUMENT or an operational condition.