tmux splitw [shell-command]

Splits a pane into two

Arguments

Name	Description
`shell-command`	A shell command to run when creating the pane

Name	Description
`-b`	Create the new pane to the left of or above target-pane
`-f`	Create a new pane spanning the full window height with -h or width with -v
`-h`	Set the pane take full height
`-I`	Create an empty pane and forward stdin to it
`-v`	Set the pane take full width
`-Z`	Zoom if the window is not zoomed
`-c <start-directory>`	Specify a start directory for the pane
`-e <environment>`	Set environment variables
`-l <size>`	Set the size in columns (horizontal split) or rows (vertical split)
`-t <src-pane>`	The target pane
`-F <format>`	Format output