zeshion

zeshion is a session manager for tmux and Zellij. It keeps the sesh command shape where practical, while making the selected multiplexer explicit and supporting both tmux sessions and Zellij sessions from one CLI.

The project is derived from the MIT-licensed joshmedeski/sesh codebase.

Status

zeshion is usable locally, but first public release packaging is still being prepared. The current install path is Go-based.

Install

Install from the module path:

go install github.com/OneNoted/zeshion@latest

Build from a checkout:

go build -o zeshion .

Build into GOPATH/bin with version metadata:

just build dev

If you want existing sesh muscle memory:

alias sesh=zeshion

Requirements

• Go 1.25 or newer to build from source.
• tmux for tmux session management.
• zellij for Zellij session management.
• zoxide for zoxide-backed directory sessions.
• A picker-compatible terminal for zeshion picker.

Commands

Most commands follow the sesh shape:

zeshion list
zeshion list --tmux
zeshion list --zellij
zeshion list --config --zoxide
zeshion connect my-session
zeshion connect --root "$PWD"
zeshion picker
zeshion preview my-session
zeshion last
zeshion window
zeshion window ~/projects/my-app

Aliases are preserved where practical:

Command	Aliases
list	l
connect	cn
clone	cl
picker	pick, pk
preview	p
root	r
last	L
window	w

Multiplexer Selection

zeshion defaults to --multiplexer auto.

Auto mode chooses:

1. Zellij when running inside Zellij.
2. tmux when running inside tmux.
3. The multiplexer value from config.
4. tmux as the compatibility fallback.

Override the multiplexer per command:

zeshion --multiplexer tmux list
zeshion --multiplexer zellij list
zeshion --multiplexer zellij connect my-session

tmux And Zellij Behavior

Action	tmux	Zellij
List live sessions	tmux list-sessions	zellij list-sessions
Connect outside a session	Attach to the tmux session	Attach to the Zellij session in the current terminal
Connect inside a session	Switch tmux client	Switch Zellij session
Create session	New tmux session	Zellij attach/create flow
Window command	tmux windows	Zellij tabs
tmuxinator/tmuxp	tmux-only path	Not used for native Zellij sessions

For Zellij, the important rule is simple: outside Zellij, selecting a Zellij session opens that session in the current terminal; inside Zellij, selecting a Zellij session switches the active Zellij session.

Picker

Use the interactive picker:

zeshion picker

Filter the picker input sources:

zeshion picker --tmux
zeshion picker --zellij
zeshion picker --config --zoxide
zeshion picker --hide-duplicates

Customize picker text:

zeshion picker --prompt "session> " --placeholder "Find session"

Configuration

zeshion looks for config files in this order:

1. The path passed with --config.
2. ~/.config/zeshion/zeshion.toml.
3. Legacy ~/.config/zesh/zesh.toml.
4. Legacy ~/.config/sesh/sesh.toml.
5. Built-in defaults when no config exists.

Minimal config:

multiplexer = "auto"
tmux_command = "tmux"
zellij_command = "zellij"

[default_session]
startup_command = "nvim"
preview_command = "ls -la {}"

[[session]]
name = "dotfiles"
path = "~/dotfiles"
startup_command = "nvim"

Use the JSON schema from zeshion.schema.json.

Migration

From sesh:

• Keep your existing ~/.config/sesh/sesh.toml; zeshion will read it if no zeshion or zesh config exists.
• Add multiplexer = "auto" or multiplexer = "tmux" if you want the choice to be explicit.
• tmux-specific features such as tmuxinator stay on the tmux path.
• Add zellij_command = "zellij" if you use a wrapper or custom Zellij binary name.

From pre-release zesh:

• Rename ~/.config/zesh/zesh.toml to ~/.config/zeshion/zeshion.toml when convenient.
• The old zesh config path remains a fallback for local migration.
• The binary is now zeshion.

Troubleshooting

Selecting a Zellij session from a normal terminal should open the Zellij UI.

If it only sends actions to an existing Zellij pane, make sure you are running an up-to-date zeshion binary and not an old zesh binary. Check:

command -v zeshion
zeshion --version

--multiplexer auto chooses the wrong multiplexer.

Use an explicit override while debugging:

zeshion --multiplexer tmux list
zeshion --multiplexer zellij list

Then set multiplexer = "tmux" or multiplexer = "zellij" in config if you do not want auto-selection.

No config is found.

Run with an explicit config path:

zeshion --config ~/.config/zeshion/zeshion.toml list

Development

just mock
go test ./...
go test -race ./...
go vet ./...
go build -o zeshion .

Generate the man page:

just man

Manual release checks live in docs/release-smoke-test.md.

Version-control work in this repo uses Jujutsu (jj).

Attribution

zeshion is based on joshmedeski/sesh, which is distributed under the MIT License. The original copyright notice is preserved in LICENSE; the upstream derivation is also recorded in NOTICE.