# tmux show-environment

Source: https://libtmux.org/en/tmux/latest/manual/show-environment/

> Display the environment for target-session or the global environment with -g.

Display the environment for target-session or the global environment with -g.

## Syntax

```tmux-usage
tmux show-environment [-hgs] [-t target-session] [variable]
```

Alias: `showenv`.

## Behavior

Display the environment for `target-session` or the global environment with `-g`. If `variable` is omitted, all variables are shown. Variables removed from the environment are prefixed with ‘`-`’. If `-s` is used, the output is formatted as a set of Bourne shell commands. `-h` shows hidden variables (omitted by default).

## C implementation

Internal declarations in tmux 3.7c:

* [`cmd_show_environment_entry`](https://libtmux.org/en/tmux/latest/reference/c-variable-cmd_show_environment_entry/)
* [`cmd_show_environment_exec`](https://libtmux.org/en/tmux/latest/reference/c-function-cmd-show-environment-c-cmd_show_environment_exec/)

tmux sources and license

Syntax comes from `tmux 3.7c list-commands`. See the [global options](https://libtmux.org/en/tmux/latest/manual/full/#DESCRIPTION) for sockets and configuration, and [command syntax and targets](https://libtmux.org/en/tmux/latest/manual/full/#COMMANDS).

Behavior is taken from the [tmux 3.7c manual](https://github.com/tmux/tmux/blob/79072dd1a9f5fb437a5859e362a496fd57ec0981/tmux.1).

[Command declaration](https://github.com/tmux/tmux/blob/79072dd1a9f5fb437a5859e362a496fd57ec0981/cmd-show-environment.c#L38)

```
Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
```