printenv - macOS

Overview

printenv is a macOS command that displays all environment variables and their values. It provides a convenient way to examine the current environment settings and identify any potential issues.

Syntax

printenv [parameter]...

Options/Flags

| Option | Description |
|—|—|
| -0 | Print each variable on a separate line with a null-terminated string. Useful for processing with scripts. |
| -a | Print the environment variables used in the calling shell. |
| -i | Print the environment variables set with inherited shells. |
| -n | Print the environment variables set with the current shell. |
| -r | Print the environment variables that are read-only. |
| -u | Print the environment variables that are unset. |

Examples

List all environment variables:
```
printenv
```
Print the value of a specific variable:
```
printenv PATH
```

Print environment variables for use in a script:

printenv -0 | while read line; do export $line; done

Common Issues

Uninitialized variables: If a variable is not set, it will be printed as an empty string.
Duplicate variables: If multiple variables have the same name, only the last one is displayed.

Integration

Shell scripts: Use printenv to access environment variables within shell scripts.
Debug: Use printenv -i to identify the environment variables inherited by a shell script.

env: Prints the environment of a program.
set: Sets environment variables.