41 lines
1.2 KiB
Markdown
Executable File
41 lines
1.2 KiB
Markdown
Executable File
# The `env` command
|
|
|
|
The `env` command in Linux/Unix is used to either print a list of the current environment variables or to run a program in a custom environment without changing the current one.
|
|
|
|
## Syntax
|
|
|
|
```bash
|
|
env [OPTION]... [-] [NAME=VALUE]... [COMMAND [ARG]...]
|
|
```
|
|
|
|
## Usage
|
|
|
|
1. Print out the set of current environment variables
|
|
```bash
|
|
env
|
|
```
|
|
2. Run a command with an empty environment
|
|
```bash
|
|
env -i command_name
|
|
```
|
|
3. Remove variable from the environment
|
|
```bash
|
|
env -u variable_name
|
|
```
|
|
4. End each output with NULL
|
|
```bash
|
|
env -0
|
|
```
|
|
|
|
## Full List of Options
|
|
|
|
|**Short Flag** |**Long Flag** |**Description** |
|
|
|:---|:---|:---|
|
|
|`-i`|`--ignore-environment`|Start with an empty environment|
|
|
|`-0`|`--null`|End each output line with NUL, not newline|
|
|
|`-u`|`--unset=NAME `|Remove variable from the environment|
|
|
|`-C`|`--chdir=DIR`|Change working directory to DIR|
|
|
|`-S`|`--split-string=S`|Process and split S into separate arguments. It's used to pass multiple arguments on shebang lines|
|
|
|`-v`|`--debug`|Print verbose information for each processing step|
|
|
|-|`--help`|Print a help message|
|
|
|-|`--version`|Print the version information| |